CN113174262A - Passivator for inhibiting rice absorption and reducing rice heavy metal content and application and use method thereof - Google Patents
Passivator for inhibiting rice absorption and reducing rice heavy metal content and application and use method thereof Download PDFInfo
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- CN113174262A CN113174262A CN202110406360.1A CN202110406360A CN113174262A CN 113174262 A CN113174262 A CN 113174262A CN 202110406360 A CN202110406360 A CN 202110406360A CN 113174262 A CN113174262 A CN 113174262A
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- Prior art keywords
- rice
- passivator
- parts
- absorption
- heavy metals
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- 241000209094 Oryza Species 0.000 title claims abstract description 163
- 235000007164 Oryza sativa Nutrition 0.000 title claims abstract description 163
- 235000009566 rice Nutrition 0.000 title claims abstract description 163
- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 105
- 238000010521 absorption reaction Methods 0.000 title claims abstract description 44
- 230000002401 inhibitory effect Effects 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000000126 substance Substances 0.000 claims abstract description 35
- 229910052753 mercury Inorganic materials 0.000 claims abstract description 34
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000010703 silicon Substances 0.000 claims abstract description 33
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 33
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims abstract description 29
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000003337 fertilizer Substances 0.000 claims abstract description 28
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 27
- 239000011651 chromium Substances 0.000 claims abstract description 27
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910052785 arsenic Inorganic materials 0.000 claims abstract description 26
- 239000011575 calcium Substances 0.000 claims abstract description 26
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 26
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229910052793 cadmium Inorganic materials 0.000 claims abstract description 24
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 claims abstract description 24
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 22
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 claims abstract description 22
- 239000010452 phosphate Substances 0.000 claims abstract description 17
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims abstract description 17
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 14
- 239000005077 polysulfide Substances 0.000 claims abstract description 14
- 229920001021 polysulfide Polymers 0.000 claims abstract description 13
- 150000008117 polysulfides Polymers 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 11
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 238000002791 soaking Methods 0.000 claims abstract description 6
- 239000002689 soil Substances 0.000 claims description 44
- 239000000843 powder Substances 0.000 claims description 36
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 18
- 239000011572 manganese Substances 0.000 claims description 17
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 15
- 229910052748 manganese Inorganic materials 0.000 claims description 15
- -1 alum Chemical compound 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 12
- 239000004576 sand Substances 0.000 claims description 12
- 239000000292 calcium oxide Substances 0.000 claims description 9
- 235000012255 calcium oxide Nutrition 0.000 claims description 9
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims description 8
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 8
- KRKNYBCHXYNGOX-UHFFFAOYSA-K Citrate Chemical group [O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O KRKNYBCHXYNGOX-UHFFFAOYSA-K 0.000 claims description 7
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 7
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 7
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 claims description 6
- YYRMJZQKEFZXMX-UHFFFAOYSA-N calcium;phosphoric acid Chemical compound [Ca+2].OP(O)(O)=O.OP(O)(O)=O YYRMJZQKEFZXMX-UHFFFAOYSA-N 0.000 claims description 5
- 239000002426 superphosphate Substances 0.000 claims description 5
- 235000019738 Limestone Nutrition 0.000 claims description 3
- 229940037003 alum Drugs 0.000 claims description 3
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 3
- 239000001506 calcium phosphate Substances 0.000 claims description 3
- KMQAPZBMEMMKSS-UHFFFAOYSA-K calcium;magnesium;phosphate Chemical compound [Mg+2].[Ca+2].[O-]P([O-])([O-])=O KMQAPZBMEMMKSS-UHFFFAOYSA-K 0.000 claims description 3
- 239000010459 dolomite Substances 0.000 claims description 3
- 229910000514 dolomite Inorganic materials 0.000 claims description 3
- 229910052598 goethite Inorganic materials 0.000 claims description 3
- AEIXRCIKZIZYPM-UHFFFAOYSA-M hydroxy(oxo)iron Chemical compound [O][Fe]O AEIXRCIKZIZYPM-UHFFFAOYSA-M 0.000 claims description 3
- YOBAEOGBNPPUQV-UHFFFAOYSA-N iron;trihydrate Chemical compound O.O.O.[Fe].[Fe] YOBAEOGBNPPUQV-UHFFFAOYSA-N 0.000 claims description 3
- 239000006028 limestone Substances 0.000 claims description 3
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 claims description 3
- 229910000391 tricalcium phosphate Inorganic materials 0.000 claims description 3
- 235000019731 tricalcium phosphate Nutrition 0.000 claims description 3
- 229940078499 tricalcium phosphate Drugs 0.000 claims description 3
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- XBDUTCVQJHJTQZ-UHFFFAOYSA-L iron(2+) sulfate monohydrate Chemical compound O.[Fe+2].[O-]S([O-])(=O)=O XBDUTCVQJHJTQZ-UHFFFAOYSA-L 0.000 claims 1
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 28
- 230000002829 reductive effect Effects 0.000 description 23
- 238000001179 sorption measurement Methods 0.000 description 17
- 230000002860 competitive effect Effects 0.000 description 13
- SURQXAFEQWPFPV-UHFFFAOYSA-L iron(2+) sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Fe+2].[O-]S([O-])(=O)=O SURQXAFEQWPFPV-UHFFFAOYSA-L 0.000 description 10
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 8
- 150000002500 ions Chemical class 0.000 description 8
- 238000001514 detection method Methods 0.000 description 7
- 229910052500 inorganic mineral Inorganic materials 0.000 description 7
- 235000010755 mineral Nutrition 0.000 description 7
- 239000011707 mineral Substances 0.000 description 7
- 239000002686 phosphate fertilizer Substances 0.000 description 7
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 6
- 239000011574 phosphorus Substances 0.000 description 6
- 229910052698 phosphorus Inorganic materials 0.000 description 6
- 230000009467 reduction Effects 0.000 description 6
- 230000007774 longterm Effects 0.000 description 5
- 239000002244 precipitate Substances 0.000 description 5
- WLZRMCYVCSSEQC-UHFFFAOYSA-N cadmium(2+) Chemical compound [Cd+2] WLZRMCYVCSSEQC-UHFFFAOYSA-N 0.000 description 4
- YYRMJZQKEFZXMX-UHFFFAOYSA-L calcium bis(dihydrogenphosphate) Chemical compound [Ca+2].OP(O)([O-])=O.OP(O)([O-])=O YYRMJZQKEFZXMX-UHFFFAOYSA-L 0.000 description 4
- 229910000389 calcium phosphate Inorganic materials 0.000 description 4
- 239000008394 flocculating agent Substances 0.000 description 4
- 235000013305 food Nutrition 0.000 description 4
- 235000019691 monocalcium phosphate Nutrition 0.000 description 4
- 238000010899 nucleation Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000002161 passivation Methods 0.000 description 4
- 150000003017 phosphorus Chemical class 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 229910001430 chromium ion Inorganic materials 0.000 description 3
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 3
- 238000005342 ion exchange Methods 0.000 description 3
- 230000002262 irrigation Effects 0.000 description 3
- 238000003973 irrigation Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 230000001737 promoting effect Effects 0.000 description 3
- 230000000717 retained effect Effects 0.000 description 3
- 230000006641 stabilisation Effects 0.000 description 3
- 238000011105 stabilization Methods 0.000 description 3
- 230000002195 synergetic effect Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052980 cadmium sulfide Inorganic materials 0.000 description 2
- FUFJGUQYACFECW-UHFFFAOYSA-L calcium hydrogenphosphate Chemical compound [Ca+2].OP([O-])([O-])=O FUFJGUQYACFECW-UHFFFAOYSA-L 0.000 description 2
- CADZRPOVAQTAME-UHFFFAOYSA-L calcium;hydroxy phosphate Chemical compound [Ca+2].OOP([O-])([O-])=O CADZRPOVAQTAME-UHFFFAOYSA-L 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 235000019700 dicalcium phosphate Nutrition 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910021645 metal ion Inorganic materials 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- QXKXDIKCIPXUPL-UHFFFAOYSA-N sulfanylidenemercury Chemical compound [Hg]=S QXKXDIKCIPXUPL-UHFFFAOYSA-N 0.000 description 2
- WUPHOULIZUERAE-UHFFFAOYSA-N 3-(oxolan-2-yl)propanoic acid Chemical compound OC(=O)CCC1CCCO1 WUPHOULIZUERAE-UHFFFAOYSA-N 0.000 description 1
- 229910017251 AsO4 Inorganic materials 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- URZCDGQPHJMOCJ-UHFFFAOYSA-J P(=O)([O-])([O-])[O-].O[Pb+3] Chemical compound P(=O)([O-])([O-])[O-].O[Pb+3] URZCDGQPHJMOCJ-UHFFFAOYSA-J 0.000 description 1
- JNVCSEDACVAATK-UHFFFAOYSA-L [Ca+2].[S-]SSS[S-] Chemical compound [Ca+2].[S-]SSS[S-] JNVCSEDACVAATK-UHFFFAOYSA-L 0.000 description 1
- VQGDMLVVLYKWQN-UHFFFAOYSA-N [Fe].[Pb].[P] Chemical compound [Fe].[Pb].[P] VQGDMLVVLYKWQN-UHFFFAOYSA-N 0.000 description 1
- KJNJCRABCUHOJK-UHFFFAOYSA-N [Pb].[P] Chemical compound [Pb].[P] KJNJCRABCUHOJK-UHFFFAOYSA-N 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000001391 atomic fluorescence spectroscopy Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- JGIATAMCQXIDNZ-UHFFFAOYSA-N calcium sulfide Chemical compound [Ca]=S JGIATAMCQXIDNZ-UHFFFAOYSA-N 0.000 description 1
- 229910000151 chromium(III) phosphate Inorganic materials 0.000 description 1
- IKZBVTPSNGOVRJ-UHFFFAOYSA-K chromium(iii) phosphate Chemical compound [Cr+3].[O-]P([O-])([O-])=O IKZBVTPSNGOVRJ-UHFFFAOYSA-K 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000000673 graphite furnace atomic absorption spectrometry Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000001095 inductively coupled plasma mass spectrometry Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical compound [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- 229910052981 lead sulfide Inorganic materials 0.000 description 1
- 229940056932 lead sulfide Drugs 0.000 description 1
- 231100001231 less toxic Toxicity 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- DNUMSHUWKXQLDT-UHFFFAOYSA-H mercury(2+);diphosphate Chemical compound [Hg+2].[Hg+2].[Hg+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O DNUMSHUWKXQLDT-UHFFFAOYSA-H 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002681 soil colloid Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
- C09K17/08—Aluminium compounds, e.g. aluminium hydroxide
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B1/00—Superphosphates, i.e. fertilisers produced by reacting rock or bone phosphates with sulfuric or phosphoric acid in such amounts and concentrations as to yield solid products directly
- C05B1/02—Superphosphates
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B1/00—Superphosphates, i.e. fertilisers produced by reacting rock or bone phosphates with sulfuric or phosphoric acid in such amounts and concentrations as to yield solid products directly
- C05B1/04—Double-superphosphate; Triple-superphosphate; Other fertilisers based essentially on monocalcium phosphate
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B13/00—Fertilisers produced by pyrogenic processes from phosphatic materials
- C05B13/02—Fertilisers produced by pyrogenic processes from phosphatic materials from rock phosphates
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B3/00—Fertilisers based essentially on di-calcium phosphate
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B7/00—Fertilisers based essentially on alkali or ammonium orthophosphates
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/80—Soil conditioners
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
- C09K17/06—Calcium compounds, e.g. lime
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2101/00—Agricultural use
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Pest Control & Pesticides (AREA)
- Inorganic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Fertilizers (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The application relates to the field of environmental chemistry, and particularly discloses a passivator for inhibiting rice absorption and reducing rice heavy metal content, and an application and a use method thereof. The passivator is prepared by mixing the following raw materials in parts by weight: 10-20 parts of phosphate; 5-10 parts of inorganic alkaline substances; 5-10 parts of calcium polysulfide; 10-20 parts of a silicon fertilizer; 10-20 parts of an inorganic flocculant; 15-25 parts of iron oxide; 10-20 parts of manganese oxide; the passivator is applied to a paddy field containing heavy metals, wherein the heavy metals are one or a combination of lead, cadmium, arsenic, mercury and chromium; the use method of the passivator comprises the following steps: s1, intertilling the rice field, and meanwhile, scattering a passivating agent; s2, soaking in water. The passivator has the advantages of inhibiting the absorption of heavy metals by rice and reducing the content of the heavy metals in rice.
Description
Technical Field
The application relates to the field of environmental chemistry, in particular to a passivator for inhibiting rice from absorbing and reducing the heavy metal content in rice, and an application and a use method thereof.
Background
Rice is one of the main food crops in the world, and more than half of the global population takes rice as staple food. During the growth of rice, nutrients are required to be extracted from the rice field.
However, due to the heavy metal pollution of the increasingly worsened soil, heavy metals such as lead, cadmium, arsenic, mercury and chromium contained in the polluted rice field have strong chemical activity and biological effectiveness, the yield of the rice is influenced, the heavy metals are easy to be absorbed by the rice and remain in the rice, the life and health of human beings are harmed through a food chain, and the serious hidden danger and threat are brought to the life of people.
Disclosure of Invention
In order to inhibit the absorption of heavy metals by rice and reduce the heavy metal content in rice, the application provides a passivator for inhibiting the absorption of rice and reducing the heavy metal content in rice, and an application and a use method thereof.
In a first aspect, the application provides a passivator for inhibiting rice from absorbing and reducing the heavy metal content of rice, which adopts the following technical scheme:
a passivator for inhibiting rice absorption and reducing rice heavy metal content is prepared by mixing the following raw materials in parts by weight:
10-20 parts of phosphate;
5-10 parts of inorganic alkaline substances;
5-10 parts of calcium polysulfide;
10-20 parts of a silicon fertilizer;
10-20 parts of an inorganic flocculant;
15-25 parts of iron oxide;
10-20 parts of manganese oxide.
By adopting the technical scheme, the passivating agent is added into the rice field before the rice field is soaked in water, the silicon fertilizer provides the favorite silicon element of the rice, and the rice can absorb silicon more easily at the root of the rice, so that competitive adsorption effect on lead, cadmium, arsenic, mercury and chromium is generated, and the absorption capacity of the root of the rice on each heavy metal is reduced.
Calcium polysulfide and inorganic flocculant are quickly dissolved in original water in the rice field to serve as a reaction platform, and Cr is added6+Reducing into low-toxicity Cr3+The chemical activity and the biological effectiveness of the chromium in the paddy soil are reduced, so that the chromium is not easy to move in the paddy soil, and the absorption amount of the paddy root to the chromium is reduced.
After the paddy field is soaked in water, the manganese oxide and the iron oxide generate Fe under the reduction condition of long-term soaking in water2+、Mn2+At the root of rice and Cd2+、Pb2+、Hg2+Generates competitive adsorption, reduces the absorption of cadmium, lead and mercury by the rice roots, and then S generated by dissolving calcium polysulfide2-Cd not absorbed by rice roots in rice field soil2+、Pb2+、Hg2+And precipitates which are not easy to dissolve are generated through reaction, the chemical activity and the biological effectiveness of cadmium, lead and mercury are reduced, the cadmium, lead and mercury are stably placed in the soil of the rice field, and the absorption amount of the rice roots to the cadmium, lead and mercury is further reduced.
Manganese oxide firstly prepares AS in the paddy soil3+By oxidation to less toxic As5+On the one hand, As5+Adsorbed by iron oxide, and on the other hand, inorganic flocculants such As ferrous sulfate hydrate and As5+Combined to form a precipitate FeAsO which is not easy to dissolve4From the two aspects, the chemical activity and the biological effectiveness of arsenic in soil are reduced, so that the absorption amount of arsenic by rice roots is reduced.
Phosphate such as calcium hydrophosphate and inorganic alkaline substance such as quicklime powder are combined to easily generate calcium hydroxy phosphate, and under the action of Gibbs free enthalpy, the calcium hydroxy phosphate reacts with free heavy metals contained in the paddy soil to form various phosphorus salt heavy metal mineral substances with non-biological effectiveness, stabilization and harmlessness, so that the reduction effects of chemical activity and biological effectiveness on lead, cadmium, arsenic, mercury and chromium in the paddy soil are enhanced and deepened, and the absorption capacity of the paddy roots on the lead, cadmium, arsenic, mercury and chromium is reduced.
The silicon fertilizer can capture free heavy metal through adsorption, adhesion or ion exchange and the like, and the inorganic flocculant bridges among all particles of the passivator, so that the free heavy metal reacts with all particles of the passivator, and the generation of complex type phosphorus salt heavy metal minerals is accelerated and catalyzed.
For example, lead is the lead-deactivated and harmless calcium substitution reaction as follows:
5Pb2++Ca5(PO4)3(OH)→5Ca2++Pb5(PO4)3(OH), namely, the hydroxyl lead phosphate ore is generated.
Since the inorganic flocculant can provide iron ions, aluminum ions or sulfate ions, the inorganic flocculant can react with hydroxylComplex iron-phosphorus-lead ore-PbFe formed from phosphorus-lead ore3(PO4)(OH)6SO4Or complex AlP-Pb ore- -PbAl3(PO4)2(OH)6SO4Both can stably exist in the paddy field soil.
The cadmium passivation and harmless calcium substitution reaction is as follows: 5Cd2++Ca5(PO4)3(OH)→5Ca2++Cd5(PO4)3(OH), namely, the hydroxyl cadmium phosphate is generated.
The principle of arsenic stabilization and harmless reaction is mainly AsO4 3-Substituted Ca5(PO4)3PO in (OH)4 3-The gibbs effect of (a) to form arsenic hydroxyphosphate.
For heavy metal chromium, Cr3+Will react with Ca5(PO4)3(OH) reacting to form complex chromium hydroxyphosphate mineral. In addition, Cr3+Will also be PO4 3-The reaction produces insoluble matter chromium phosphate ore.
For the heavy metal mercury, Hg2+Reacting with phosphate to generate mercury phosphate ore.
The rice is a typical crop which likes silicon and accumulates silicon, the demand for silicon is high, the silicon fertilizer can reduce the fixation of phosphate fertilizer in soil, activate phosphorus in the soil, promote the absorption of the root of the rice to the phosphorus and improve the utilization of the phosphate fertilizer, and the phosphate belongs to the phosphate fertilizer beneficial to the growth of the rice, so the silicon fertilizer can also play an effective promoting role and a synergistic effect on the reaction process of the phosphate for passivating heavy metals.
In addition, an effective thermodynamic equilibrium effect is formed in the formation process of the phosphorus salt heavy metal minerals, so that the substances can stably exist in the paddy field soil, and can not be decomposed to release heavy metal ions again even after a long time or in an acid rain environment, and the absorption amount of lead, cadmium, arsenic, mercury and chromium in the paddy field soil by the paddy root is greatly reduced.
Therefore, under the synergistic, promoting and strengthening effects of the substances, the passivator firstly plays a competitive adsorption role in the process of absorbing heavy metals at the roots of rice to inhibit the absorption reaction of the rice to the heavy metals, then carries out oxidation, reduction, adsorption, ion exchange and the like on free heavy metals, reduces the chemical activity and biological effectiveness of the heavy metals, generates insoluble precipitates, reduces the mobility of the heavy metals, enables the heavy metals to be stably retained in the soil of the rice field and not to be migrated to the roots of the rice to be absorbed, and obtains the effects of reducing the absorption amount of the rice to the heavy metals and reducing the content of the heavy metals in the rice.
Optionally, the phosphate is one or more of tricalcium phosphate, calcium hydrogen phosphate, triple superphosphate, calcium superphosphate and calcium magnesium phosphate.
By adopting the technical scheme, when the substances are adopted, the phosphate can be more effectively attached to the surface of the paddy field soil particles and is not easy to run off, a layer of guarantee film is formed in a paddy field soil structure body, and the dissociative heavy metal is wound and braided, so that each raw material in the passivator can react with the heavy metal, and the reaction is promoted.
Optionally, the inorganic alkaline substance is one or a combination of dolomite powder, limestone powder and quicklime powder.
By adopting the technical scheme, when the substances are adopted, OH can be generated by dissolving the substances in water-So as to promote the generation of the complex phosphate heavy metal mineral substances, so that the heavy metals are more stably retained in the paddy soil and are not easy to be absorbed by the roots of the rice.
Optionally, the silicon fertilizer is citrate soluble silicon fertilizer.
By adopting the technical scheme, the citrate soluble silicon fertilizer has stronger adsorption force, strengthens the binding capacity of each raw material and heavy metal in the passivator, and promotes the reaction; and the activity of the phosphate fertilizer in the soil can be improved, the phosphorus in the soil is activated, the absorption of root systems to the phosphorus is promoted, and the utilization rate of the phosphate fertilizer is improved. Meanwhile, the citrate soluble silicon fertilizer can also provide silicon elements required by rice, and the rice yield is improved.
Optionally, the inorganic flocculant is one or a combination of aluminum sulfate, alum, ferric sulfate, ferrous sulfate hydrate, polyaluminum sulfate, ferric polysilicate, polyferric sulfate and a modified inorganic flocculant.
By adopting the technical scheme, the inorganic flocculant can directly or indirectly provide the complexed Fe3+、Al3+Or SO4 2-And the flocculant has a flocculation function, can strongly adsorb free heavy metal ions, and accelerates the generation of complex phosphate heavy metal minerals through the actions of adsorption, bridge frame, crosslinking and the like.
Optionally, the iron oxide is one or a combination of magnetite powder, natural hematite powder, goethite powder and iron oxide powder.
By adopting the technical scheme, when the substances are adopted, the iron oxide has stronger adsorption effect on arsenic ions and cadmium ions.
Optionally, the manganese oxide is one or a combination of a plurality of natural manganese ore powder, manganese dioxide and manganese sand filter materials.
By adopting the technical scheme, when the substances are adopted, the manganese oxide can oxidize toxic As3+To be low-toxic As5+And lead ions, mercury ions, hexavalent chromium ions and the like can be strongly adsorbed, so that the mobility of the lead ions, the mercury ions, the hexavalent chromium ions and the like in soil is reduced, and the quantity of the lead ions, the mercury ions, the hexavalent chromium ions and the like absorbed by the roots of rice is reduced.
In a second aspect, the application provides an application of a passivator for inhibiting rice from absorbing and reducing the heavy metal content of rice, which adopts the following technical scheme:
the application of the passivator for inhibiting the absorption of paddy and reducing the content of heavy metal in paddy fields comprises applying the passivator to the paddy fields containing heavy metal, wherein the heavy metal is one or a combination of lead, cadmium, arsenic, mercury and chromium.
By adopting the technical scheme, the passivating agent is applied to the paddy field containing heavy metals, can effectively reduce the chemical activity and the biological effectiveness of lead, cadmium, arsenic, mercury and chromium, and provides substances which have competitive action on lead, cadmium, arsenic, mercury and chromium and are easy to absorb by the roots of paddy rice, so that the absorption of the paddy rice on the heavy metals is effectively reduced, and the content of the heavy metals in the paddy rice is reduced.
In a third aspect, the application provides a use method of a passivator for inhibiting rice from absorbing and reducing the heavy metal content of rice, which adopts the following technical scheme:
a use method of a passivator for inhibiting rice from absorbing and reducing the heavy metal content of rice comprises the following steps:
s1, intertilling the rice field, and simultaneously scattering the passivator until the passivator is uniformly mixed with the soil of the rice field;
and S2, soaking the paddy field water evenly mixed with the passivating agent.
By adopting the technical scheme, while intertillage is carried out on the rice field, the passivant is scattered, the soil in the rice field can be fully mixed with the passivant, and then the passivant is soaked in water in the rice field, so that the passivant can fully react with the soil in the rice field, the chemical activity and the biological effectiveness of lead, cadmium, arsenic, mercury and chromium are effectively reduced, substances which have competitive action on lead, cadmium, arsenic, mercury and chromium and are easy to absorb by the roots of the rice are provided, the absorption of heavy metals by the rice is effectively reduced, and the heavy metal content in the rice is reduced.
Optionally, the S1 includes the following steps:
s11, intertilling the rice field, and scattering a part of the passivator until the passivator is uniformly mixed with the soil of the rice field;
s12, deeply ploughing the rice field;
and S13, cultivating the rice field, and simultaneously spraying the other part of the passivator until the passivator is uniformly mixed with the soil of the rice field.
By adopting the technical scheme, the step of deep ploughing is added in the rice field intertillage process, so that the water, fertilizer, gas and heat conditions of soil can be improved, the application range of the passivator is expanded, a larger action space is provided for the passivator, the passivator and the rice field soil are fully combined to reduce the absorption of heavy metals by rice, the heavy metal content in the rice is reduced, the growth of rice root systems can be promoted, and the yield increasing effect is remarkable.
In summary, the present application has the following beneficial effects:
1. under the synergistic, promoting and strengthening effects of the substances, the passivator firstly plays a competitive adsorption role in the process of absorbing heavy metals at the root of rice to inhibit the absorption reaction of the rice to the heavy metals, then carries out oxidation, reduction, adsorption, ion exchange and the like on free heavy metals, reduces the chemical activity and the biological effectiveness of the heavy metals, generates insoluble precipitates, reduces the mobility of the heavy metals, enables the heavy metals to be stably retained in the soil of the rice field and not to be migrated to the root of the rice to be absorbed, and obtains the effects of reducing the absorption capacity of the rice to the heavy metals and reducing the content of the heavy metals in the rice.
2. The citric-soluble silicon fertilizer has strong adsorption force, strengthens the binding capacity of each raw material and heavy metal in the passivator, and promotes the reaction; and the activity of the phosphate fertilizer in the soil can be improved, the phosphorus in the soil is activated, the absorption of root systems to the phosphorus is promoted, and the utilization rate of the phosphate fertilizer is improved. Meanwhile, the citrate soluble silicon fertilizer can also provide silicon elements required by rice, and the rice yield is improved.
3. According to the application method, the passivant is scattered while the rice field is intertillated, so that the soil of the rice field can be fully mixed with the passivant, and then the passivant is soaked in water in the rice field, so that the passivant and the soil of the rice field can be fully reacted, the chemical activity and the biological effectiveness of lead, cadmium, arsenic, mercury and chromium are effectively reduced, substances which have a competitive effect on lead, cadmium, arsenic, mercury and chromium and are easy to absorb by the roots of the rice are provided, the absorption of heavy metals by the rice is effectively reduced, and the heavy metal content in the rice is reduced.
Detailed Description
The present application will be described in further detail with reference to examples. The special description is as follows: the following examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer, and the starting materials used in the following examples were obtained from ordinary commercial sources unless otherwise specified.
The phosphate is one or more of tricalcium phosphate, calcium hydrophosphate, triple superphosphate, superphosphate and calcium magnesium phosphate. Calcium hydrogen phosphate, calcium superphosphate or a combination of the two is selected in the following examples.
The inorganic alkaline substance is one or more of dolomite powder, limestone powder and quicklime powder. Quicklime powder was selected in the following examples.
Calcium polysulfide crystal is lime sulfur crystal, and the content of effective component is 45%.
The silicon fertilizer is citrate soluble silicon fertilizer.
The inorganic flocculant is one or more of aluminum sulfate, alum, ferric sulfate, ferrous sulfate hydrate, polyaluminium sulfate, ferric polysilicate, polyferric sulfate and modified inorganic flocculant. Ferrous sulfate heptahydrate, polymeric ferric sulfate or a combination of both are selected in the following examples.
The iron oxide is one or a combination of magnetite powder, natural hematite powder, goethite powder and ferric oxide powder. Magnetite powder or iron oxide powder was selected in the following examples.
The manganese oxide is one or a combination of a plurality of natural manganese ore powder, manganese dioxide and manganese sand filter materials. MnO was selected in the following examples250% of manganese sand filter material.
The particle size of each raw material is 100-200 meshes.
Examples
Example 1
A passivator for inhibiting rice absorption and reducing the heavy metal content of paddy is prepared by uniformly mixing the following raw materials in parts by weight: 10 parts of calcium hydrophosphate; 5 parts of quicklime powder; 10 parts of calcium polysulfide; 10 parts of citric acid soluble silicon fertilizer; 15 parts of ferrous sulfate heptahydrate and 5 parts of polymeric ferric sulfate; 25 parts of magnetite powder; 20 parts of manganese sand filter material.
Example 2
A passivator for inhibiting rice absorption and reducing the heavy metal content of paddy is prepared by uniformly mixing the following raw materials in parts by weight: 15 parts of calcium hydrophosphate and 5 parts of calcium superphosphate; 10 parts of quicklime powder; 5 parts of calcium polysulfide; 20 parts of citric acid soluble silicon fertilizer; 10 parts of ferrous sulfate heptahydrate; 25 parts of iron oxide powder; 10 parts of manganese sand filter material.
Example 3
A passivator for inhibiting rice absorption and reducing the heavy metal content of paddy is prepared by uniformly mixing the following raw materials in parts by weight: 17 parts of calcium hydrophosphate; 7 parts of quicklime powder; 8 parts of calcium polysulfide; 18 parts of citrate soluble silicon fertilizer; 18 parts of ferrous sulfate heptahydrate; 15 parts of magnetite powder; and 17 parts of a manganese sand filter material.
Example 4
A passivator for inhibiting rice absorption and reducing the heavy metal content of paddy is prepared by uniformly mixing the following raw materials in parts by weight: 18 parts of calcium superphosphate; 9 parts of quicklime powder; 6 parts of calcium polysulfide; 15 parts of citric acid soluble silicon fertilizer; 16 parts of polymeric ferric sulfate; 21 parts of magnetite powder; 15 parts of manganese sand filter material.
Application example
Application example 1
A field test of one mu area is carried out on a paddy field in a certain village of a certain city in Yunnan province, and the soil in the area mainly has serious standard exceeding pollution of compound heavy metals of lead, cadmium, arsenic, mercury and chromium. 185kg of the passivator prepared in example 1 is applied to the paddy field per mu by the following method: the method comprises the following steps:
s1, placing the passivator into a intertillage seeding and fertilizing machine, and seeding the passivator in a side-plowing rice field:
s11, intertilling the rice field by 0-15 cm through an intertilling, seeding and fertilizing machine, and simultaneously scattering a part of the passivating agent until the passivating agent is uniformly mixed with the soil of the rice field;
s12, deeply ploughing the paddy field, and ploughing the soil with the lower layer of 15-20 cm to the upper layer;
and S13, intertilling the rice field by the intertilling, seeding and fertilizing machine again, and simultaneously scattering the other part of the passivator until the passivator is uniformly mixed with the soil of the rice field.
And S2, irrigating the paddy field with the even passivant.
Application example 2
The present application example differs from application example 1 in that: the applied deactivant was the deactivant prepared in example 2.
Application example 3
The present application example differs from application example 1 in that: the applied deactivant was the deactivant prepared in example 3.
Application example 4
The present application example differs from application example 1 in that: the applied deactivant was the deactivant prepared in example 4.
Application example 5
The present application example differs from application example 1 in that: no deactivant is applied.
Performance test
Detection method
Planting rice in the rice field of each application example for field test, 5 treatments in total, three times of repetition, 15 cells, adopting random block arrangement, wide-narrow row single seedling planting, planting 29 rows in each cell, and each cell having an area of 72m2And the cells are isolated by using a film, so that single irrigation and single row are realized, the serial irrigation and the serial row irrigation are avoided, and the fertilizer water and the field management measures are completely consistent. After the rice was matured, the following tests were performed:
1. detecting the content of heavy metals in the rice:
the arsenic content was determined according to the method of "determination of total arsenic first method inductively coupled plasma Mass Spectrometry" specified in GB 5009.11-2014.
The lead content was measured by the graphite furnace atomic absorption spectrometry method specified in GB 5009.12-2017.
The mercury content was determined according to the method of "determination of first method atomic fluorescence spectrometry of the first food item as generally supplied in GB 5009.17-2014".
The cadmium content is determined according to the method of GB 5009.15-2014.
The chromium content was determined according to the method of GB 5009.123-2014.
The results of the tests of the respective application examples are shown in tables 1 to 4, with the heavy metal content in the rice obtained in application example 5 as a control.
Table 1 test results of heavy metal content in rice of application example 1
Table 2 detection results of heavy metal content in rice of application example 2
Table 3 detection results of heavy metal content in rice of application example 3
Table 4 detection results of heavy metal content in rice of application example 4
2. And (5) carrying out statistics on the rice yield. The detection results of the respective application examples are shown in table 5.
TABLE 5 Rice production in the application examples
| Application example | Application example 1 | Application example 2 | Application example 3 | Application example 4 | Application example 5 |
| Yield per unit area/kg | 672.8 | 691.4 | 689.2 | 685.1 | 666.7 |
As can be seen by combining the application examples and tables 1-4, the passivators prepared in the application examples 1-4 are sequentially used in the application examples 1-4, and compared with the application example 5 without any passivator, the average reduction rate of the heavy metal content in the rice of the application examples 1-4 is as follows: 56.34 percent of arsenic, 68.65 percent of lead, 78.90 percent of mercury, 67.69 percent of cadmium and 70.05 percent of chromium. When the passivator is used for treating paddy field soil, the contents of arsenic, lead, mercury, cadmium and chromium in paddy are greatly reduced, particularly, the mercury content in example 1 reaches the result of no detection, and the chromium content in example 2 reaches the effect of no detection. Therefore, the passivator disclosed by the application has the effects of inhibiting the absorption of heavy metals by rice and reducing the content of the heavy metals in the rice.
When the examples 1 and 2 are analyzed by combining the data, the addition amounts of the inorganic flocculant, the manganese oxide and the calcium polysulfide in the example 1 are all larger than those in the example 2, and the addition amount of the iron oxide is the same, while the addition amounts of the phosphate, the inorganic alkaline substance and the silicon fertilizer in the example 2 are larger than those in the example 1, but in the application examples corresponding to the two examples, the application examples 1 and 2 both obtain a good effect of reducing the heavy metal content in the rice.
The reason for the analysis may be: as the passivating agent prepared in example 1 is added with one time more inorganic flocculating agents (ferrous sulfate heptahydrate and polymeric ferric sulfate) than the passivating agent prepared in example 2, the passivating agent contains Fe2+、Fe3+The metal ions increase the competitive adsorption effect with lead ions and cadmium ions on the roots of the rice.
The manganese sand filter material which is one time more can absorb more lead ions and can absorb As3+Oxidized into As easy to be adsorbed and fixed by paddy soil colloid and iron oxide5+(ii) a And Mn produced under the reducing condition of long-term soaking water in rice field2+Also increases Cd2+、Pb2+、Hg2+Competitive adsorption at rice roots.
And then, one time more of calcium polysulfide and 1/2 times more of ferrous sulfate heptahydrate are used for reducing and passivating more of chromium and arsenic, and the chromium and the arsenic react with more of lead, cadmium, mercury and the like to generate insoluble precipitate lead sulfide (PbS with the solubility of 9 x 10)-29) Cadmium sulfide (CdS, solubility 8 x 10)-28) And mercury sulfide (HgS, solubility 2 x 10)-53)。
Therefore, the passivator of example 1 plays a greater role in competitive adsorption of heavy metal ions and rapid-acting passivation when treating paddy soil, thereby inhibiting the absorption of heavy metals by rice and reducing the content of heavy metals in rice.
In example 2, more phosphate, inorganic alkaline substance and silicon fertilizer are used, and more of the phosphate, inorganic alkaline substance and silicon fertilizer play a main role in passivating heavy metals for a long time, and can also effectively inhibit the rice from absorbing the heavy metals and reduce the content of the heavy metals in the rice.
In addition, as is clear from table 5, the effect of the rice-increasing passivant of example 2 is more remarkable, and it should be because silicon fertilizer is used twice as much.
It should be noted that comparative analysis was carried out to show that the mercury content of rice in application example 1 using the passivator of example 1 was not detected, whereas the mercury content of rice in application example 2 using the passivator of example 2 was not detected, but was 0.02 mg/kg. Therefore, even though the phosphate is added twice as much as the passivating agent prepared in example 1 compared with the passivating agent prepared in example 2, the passivating agent still plays a role in efficiently passivating the soil containing mercury ions due to the fact that twice as much calcium polysulfide, twice as much inorganic flocculating agent and twice as much manganese sand filter material are added.
The reason for the analysis may be: the calcium polysulfide adsorbs and coprecipitates mercury ions to form mercury sulfide (HgS) with solubility of 2 x 10-53Hg of mercury3(PO4)2Has a solubility of 7.9 x 10-46Both of which are about 2.5 x 108Difference in fold. Twice as much inorganic flocculants (ferrous sulfate heptahydrate and polymeric ferric sulfate) were used, which contained Fe2+、Fe3+Plasma metal ions; and Mn produced by using one time more manganese sand filter material under the reduction condition of long-term soaking water in the rice field2+Increase Hg and Hg2+Competitive adsorption at the root of rice; more manganese sand filter materials are added to adsorb more Hg2+Reduce Hg2+Mobility of (2). Therefore, much more is addedThe calcium sulfide, the inorganic flocculant and the manganese oxide improve the effect of passivating and treating the soil containing mercury ions, thereby inhibiting the absorption of rice and reducing the heavy metal mercury contained in the rice.
In summary, the passivating agent disclosed by the application adopts substances with quick-acting passivation, long-term stabilization and competitive adsorption, and three technical means are cooperated, so that heavy metals can be passivated quickly in a short period, the competitive adsorption can be generated, the absorption of heavy metals by rice is reduced, and a long-term stabilized passivation product (complex type phosphorus salt heavy metal mineral substance) is generated, so that the absorption of heavy metals by rice is inhibited, and the content of heavy metals in rice is reduced. Meanwhile, the addition of a proper amount of silicon fertilizer has an obvious effect on increasing the yield of the paddy.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (10)
1. A passivator for inhibiting rice from absorbing and reducing the heavy metal content of paddy is characterized in that: the passivator is prepared by mixing the following raw materials in parts by weight:
10-20 parts of phosphate;
5-10 parts of inorganic alkaline substances;
5-10 parts of calcium polysulfide;
10-20 parts of a silicon fertilizer;
10-20 parts of an inorganic flocculant;
15-25 parts of iron oxide;
10-20 parts of manganese oxide.
2. The passivator for inhibiting absorption of rice and reducing content of heavy metals of rice according to claim 1, wherein: the phosphate is one or the combination of more of tricalcium phosphate, calcium hydrophosphate, triple superphosphate, superphosphate and calcium magnesium phosphate.
3. The passivator for inhibiting absorption of rice and reducing content of heavy metals of rice according to claim 1, wherein: the inorganic alkaline substance is one or a combination of more of dolomite powder, limestone powder and quicklime powder.
4. The passivator for inhibiting absorption of rice and reducing content of heavy metals of rice according to claim 1, wherein: the silicon fertilizer is citrate soluble silicon fertilizer.
5. The passivator for inhibiting absorption of rice and reducing content of heavy metals of rice according to claim 1, wherein: the inorganic flocculant is one or a combination of aluminum sulfate, alum, ferric sulfate, ferrous sulfate hydrate, polyaluminum sulfate, ferric polysilicate, polyferric sulfate and a modified inorganic flocculant.
6. The passivator for inhibiting absorption of rice and reducing content of heavy metals of rice according to claim 1, wherein: the iron oxide is one or a combination of more of magnetite powder, natural hematite powder, goethite powder and ferric oxide powder.
7. The passivator for inhibiting absorption of rice and reducing content of heavy metals of rice according to claim 1, wherein: the manganese oxide is one or a combination of a plurality of natural manganese ore powder, manganese dioxide and manganese sand filter materials.
8. The use of the passivator for inhibiting the absorption of rice and reducing the heavy metal content of rice as claimed in any one of claims 1 to 7, wherein: the passivator is applied to a paddy field containing heavy metals, wherein the heavy metals are one or a combination of lead, cadmium, arsenic, mercury and chromium.
9. The use method of the passivator for inhibiting rice absorption and reducing rice heavy metal content of claim 8, wherein: the method comprises the following steps:
s1, intertilling the rice field, and simultaneously scattering the passivator until the passivator is uniformly mixed with the soil of the rice field;
and S2, soaking the paddy field water evenly mixed with the passivating agent.
10. The use method of the passivator for inhibiting rice absorption and reducing rice heavy metal content according to claim 9, wherein: the S1 includes the steps of:
s11, intertilling the rice field, and scattering a part of the passivator until the passivator is uniformly mixed with the soil of the rice field;
s12, deeply ploughing the rice field;
and S13, cultivating the rice field, and simultaneously spraying the other part of the passivator until the passivator is uniformly mixed with the soil of the rice field.
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| CN114907733A (en) * | 2022-06-02 | 2022-08-16 | 安徽未来表面技术有限公司 | High-corrosion-resistance magnesium-aluminum alloy chromium-free fingerprint-resistant coating liquid and preparation method thereof |
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