CN114394870A - Tea garden soil fluorine reducing agent and preparation method thereof - Google Patents
Tea garden soil fluorine reducing agent and preparation method thereof Download PDFInfo
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- CN114394870A CN114394870A CN202111577562.9A CN202111577562A CN114394870A CN 114394870 A CN114394870 A CN 114394870A CN 202111577562 A CN202111577562 A CN 202111577562A CN 114394870 A CN114394870 A CN 114394870A
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- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 title claims abstract description 63
- 239000011737 fluorine Substances 0.000 title claims abstract description 63
- 229910052731 fluorine Inorganic materials 0.000 title claims abstract description 63
- 239000002689 soil Substances 0.000 title claims abstract description 58
- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 25
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 241001122767 Theaceae Species 0.000 claims abstract description 36
- 229920001661 Chitosan Polymers 0.000 claims abstract description 31
- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000004021 humic acid Substances 0.000 claims abstract description 30
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 claims abstract description 18
- 229910052939 potassium sulfate Inorganic materials 0.000 claims abstract description 18
- 235000011151 potassium sulphates Nutrition 0.000 claims abstract description 18
- 239000013543 active substance Substances 0.000 claims abstract description 17
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 159000000007 calcium salts Chemical class 0.000 claims abstract description 12
- 239000002686 phosphate fertilizer Substances 0.000 claims abstract description 12
- AZKVWQKMDGGDSV-BCMRRPTOSA-N Genipin Chemical compound COC(=O)C1=CO[C@@H](O)[C@@H]2C(CO)=CC[C@H]12 AZKVWQKMDGGDSV-BCMRRPTOSA-N 0.000 claims abstract description 10
- AZKVWQKMDGGDSV-UHFFFAOYSA-N genipin Natural products COC(=O)C1=COC(O)C2C(CO)=CCC12 AZKVWQKMDGGDSV-UHFFFAOYSA-N 0.000 claims abstract description 10
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 21
- 238000003756 stirring Methods 0.000 claims description 17
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 12
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 7
- YYRMJZQKEFZXMX-UHFFFAOYSA-L calcium bis(dihydrogenphosphate) Chemical compound [Ca+2].OP(O)([O-])=O.OP(O)([O-])=O YYRMJZQKEFZXMX-UHFFFAOYSA-L 0.000 claims description 6
- 229910000389 calcium phosphate Inorganic materials 0.000 claims description 6
- 235000019691 monocalcium phosphate Nutrition 0.000 claims description 6
- 229910000403 monosodium phosphate Inorganic materials 0.000 claims description 6
- 235000019799 monosodium phosphate Nutrition 0.000 claims description 6
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 6
- AJPJDKMHJJGVTQ-UHFFFAOYSA-M sodium dihydrogen phosphate Chemical compound [Na+].OP(O)([O-])=O AJPJDKMHJJGVTQ-UHFFFAOYSA-M 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 4
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 4
- 239000001110 calcium chloride Substances 0.000 claims description 4
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 4
- 239000001506 calcium phosphate Substances 0.000 claims description 4
- BNIILDVGGAEEIG-UHFFFAOYSA-L disodium hydrogen phosphate Chemical compound [Na+].[Na+].OP([O-])([O-])=O BNIILDVGGAEEIG-UHFFFAOYSA-L 0.000 claims description 4
- LWIHDJKSTIGBAC-UHFFFAOYSA-K tripotassium phosphate Chemical compound [K+].[K+].[K+].[O-]P([O-])([O-])=O LWIHDJKSTIGBAC-UHFFFAOYSA-K 0.000 claims description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 2
- 229940062672 calcium dihydrogen phosphate Drugs 0.000 claims description 2
- FUFJGUQYACFECW-UHFFFAOYSA-L calcium hydrogenphosphate Chemical compound [Ca+2].OP([O-])([O-])=O FUFJGUQYACFECW-UHFFFAOYSA-L 0.000 claims description 2
- 229960001714 calcium phosphate Drugs 0.000 claims description 2
- 235000011010 calcium phosphates Nutrition 0.000 claims description 2
- 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 2
- 235000019700 dicalcium phosphate Nutrition 0.000 claims description 2
- 229910000402 monopotassium phosphate Inorganic materials 0.000 claims description 2
- 235000019796 monopotassium phosphate Nutrition 0.000 claims description 2
- PJNZPQUBCPKICU-UHFFFAOYSA-N phosphoric acid;potassium Chemical compound [K].OP(O)(O)=O PJNZPQUBCPKICU-UHFFFAOYSA-N 0.000 claims description 2
- 229910000160 potassium phosphate Inorganic materials 0.000 claims description 2
- 229940093916 potassium phosphate Drugs 0.000 claims description 2
- 235000011009 potassium phosphates Nutrition 0.000 claims description 2
- 239000002426 superphosphate Substances 0.000 claims description 2
- 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 2
- 239000011149 active material Substances 0.000 claims 1
- 230000001603 reducing effect Effects 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 6
- 238000001179 sorption measurement Methods 0.000 abstract description 4
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 abstract description 3
- 239000011248 coating agent Substances 0.000 abstract description 3
- 238000000576 coating method Methods 0.000 abstract description 3
- 238000004132 cross linking Methods 0.000 abstract description 3
- 230000003993 interaction Effects 0.000 abstract description 3
- 239000007787 solid Substances 0.000 abstract description 3
- 235000013305 food Nutrition 0.000 abstract description 2
- 230000006872 improvement Effects 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 7
- 235000009024 Ceanothus sanguineus Nutrition 0.000 description 5
- 240000003553 Leptospermum scoparium Species 0.000 description 5
- 235000015459 Lycium barbarum Nutrition 0.000 description 5
- 239000011449 brick Substances 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229960005069 calcium Drugs 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- GFIKIVSYJDVOOZ-UHFFFAOYSA-L calcium;fluoro-dioxido-oxo-$l^{5}-phosphane Chemical compound [Ca+2].[O-]P([O-])(F)=O GFIKIVSYJDVOOZ-UHFFFAOYSA-L 0.000 description 2
- 208000004042 dental fluorosis Diseases 0.000 description 2
- 229910000150 monocalcium phosphate Inorganic materials 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 206010016818 Fluorosis Diseases 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000007605 air drying Methods 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000004097 bone metabolism Effects 0.000 description 1
- 235000011148 calcium chloride Nutrition 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005067 remediation Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
Classifications
-
- 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
- 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
- C05G3/40—Mixtures of one or more fertilisers with additives not having a specially fertilising activity for affecting fertiliser dosage or release rate; for affecting solubility
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Pest Control & Pesticides (AREA)
- Soil Sciences (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
- Fertilizers (AREA)
Abstract
The invention provides a tea garden soil fluorine reducing agent and a preparation method thereof, belonging to the technical field of soil conditioners. The health-care food is prepared from the following raw materials in parts by weight: 10-20 parts of phosphate fertilizer, 7-12 parts of calcium salt, 5-10 parts of potassium sulfate, 15-20 parts of chitosan and 5-12 parts of humic acid. The tea garden soil fluorine reducing agent disclosed by the invention utilizes the interaction of groups containing-OH, -NH-and the like in chitosan molecules and-COOH of humic acid to form a cage-shaped structure with a large holding capacity under the cross-linking of genipin, so that the adsorption and coating effects on active substances including phosphate fertilizer, calcium salt and potassium sulfate can be remarkably improved, the solid carrying capacity of the active substances is improved, the prepared tea garden soil fluorine reducing agent can play a role in slow release after being added into soil, and the long-acting fluorine reducing effect is achieved.
Description
Technical Field
The invention relates to the technical field of soil conditioners, in particular to a tea garden soil fluorine reducing agent and a preparation method thereof.
Background
Fluorine is widely distributed in nature, is one of essential trace elements of human bodies, plays an important role in growth and development of the human bodies and bone metabolism, and is beneficial to body health when being taken in a proper amount, but fluorine poisoning is caused by excessive taking of fluorine, and is mainly manifested by dental fluorosis and fluorosis. Tea tree is a typical polyfluorinated plant, the fluorine content in the tea is 1-2 orders of magnitude higher than that of the common plant, and the fluorine content of brick tea is the highest in all the tea. At present, the method for reducing the fluorine content of brick tea is mainly carried out in the tea processing process, and a method for reducing the fluorine content in the fresh tea raw material of the brick tea through a planting link is not reported clearly.
The fluorine in tea leaves is mainly derived from the fluorine in soil and atmosphere, wherein the soil is the main source for absorbing the fluorine by tea trees. The fluorine content of the tea tree leaves obviously influences the fluorine concentration of the tea tree leaves, researches show that soil water-soluble fluorine and salt-soluble fluorine can better reflect the biological effectiveness of the soil fluorine, and the fluorine absorption of the tea tree leaves is increased along with the increase of the water-soluble fluorine content of the soil. The soil matrix, pH, organic matters, exchangeable calcium, amorphous aluminum and the like all affect the fluorine content and occurrence form of the soil, and a large number of research results show that the pH and organic matter content of the soil are main soil factors affecting water-soluble fluorine of the soil. Therefore, the effective fluorine content of the soil is reduced by improving the pH value and the organic matter content of the soil, so that the fluorine content in the fresh tea leaves is reduced, and the method becomes one of the possible measures for reducing the fluorine content of the fresh brick tea leaf raw material.
Disclosure of Invention
The invention aims to provide a tea garden soil fluorine reducing agent and a preparation method thereof, wherein a cage-shaped structure with large accommodation capacity is formed under genipin crosslinking by utilizing the interaction of groups containing-OH, -NH and the like in chitosan molecules and-COOH of humic acid, so that the adsorption and coating effects of active substances including phosphate fertilizer, calcium salt and potassium sulfate can be obviously improved, the solid loading capacity of the active substances is improved, and the prepared tea garden soil fluorine reducing agent can play a role in slow release after being added into soil, thereby playing a role in long-acting fluorine reduction.
The technical scheme of the invention is realized as follows:
the invention provides a tea garden soil fluorine reducing agent, which is prepared from the following raw materials: phosphate fertilizer, calcium salt, potassium sulfate, chitosan and humic acid.
As a further improvement of the invention, the health-care food is prepared from the following raw materials in parts by weight: 10-20 parts of phosphate fertilizer, 7-12 parts of calcium salt, 5-10 parts of potassium sulfate, 15-20 parts of chitosan and 5-12 parts of humic acid.
In a further improvement of the present invention, the phosphate fertilizer is at least one selected from the group consisting of calcium monohydrogen phosphate, calcium superphosphate, triple superphosphate, calcium dihydrogen phosphate, calcium phosphate, potassium phosphate, sodium monohydrogen phosphate, potassium dihydrogen phosphate, and sodium dihydrogen phosphate.
As a further improvement of the present invention, the calcium salt is at least one selected from the group consisting of calcium chloride, calcium sulfate, calcium nitrate, and calcium carbonate.
The invention further provides a preparation method of the tea garden soil fluorine reducing agent, which comprises the following steps:
s1, dissolving chitosan in an acetic acid solution to obtain a chitosan solution;
s2, preparing humic acid into a solution to obtain a humic acid solution;
s3, dissolving phosphate fertilizer, calcium salt and potassium sulfate in water to obtain an active substance solution;
s4, mixing the chitosan solution and the humic acid solution, adding the active substance solution after uniformly stirring, continuously stirring for 10-20min, adding genipin, continuously stirring until the system is in a gel state, dropwise adding a sodium carbonate solution to adjust the pH value, curing at normal temperature, and drying at low temperature in vacuum to obtain the tea garden soil fluorine reducing agent.
As a further improvement of the invention, the concentration of the acetic acid solution in the step S1 is 2-5wt%, and the concentration of the chitosan solution is 1.5-3 mg/mL.
As a further improvement of the invention, the concentration of the humic acid solution in the step S2 is 0.5-2 mg/mL.
As a further improvement of the invention, the concentration of the total substance in the active substance solution in step S3 is 7-15 wt%.
As a further improvement of the invention, the addition amount of the genipin in the step S4 is 1-2wt% of the mass of the system; the pH is adjusted to 7.5-8.
As a further improvement of the invention, the stirring speed in step S4 is 300-500 r/min; the temperature of the vacuum low-temperature drying is 30-50 ℃.
The invention has the following beneficial effects: the tea garden soil fluorine reducing agent disclosed by the invention utilizes the interaction of groups containing-OH, -NH-and the like in chitosan molecules and-COOH of humic acid to form a cage-shaped structure with a large holding capacity under the cross-linking of genipin, so that the adsorption and coating effects on active substances including phosphate fertilizer, calcium salt and potassium sulfate can be remarkably improved, the solid carrying capacity of the active substances is improved, the prepared tea garden soil fluorine reducing agent can play a role in slow release after being added into soil, and the long-acting fluorine reducing effect is achieved.
After the pH value of the tea garden soil fluorine reducing agent is adjusted to be alkaline by adding sodium carbonate, the pH value of acid soil can be obviously improved, and the occurrence form of soil fluorine is changed; the contained calcium and phosphorus can convert water-soluble fluorine in the soil into insoluble substances such as calcium fluorophosphate and the like, in addition, the chitosan can further reduce the content of the water-soluble fluorine in the soil through the adsorption effect, the fluorine-polluted tea garden soil can be repaired by utilizing various raw materials with low cost through a simple process, the activity of the fluorine in the soil can be effectively reduced, the harm of the fluorine is reduced, and the content of the fluorine in the tea leaves is reduced.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The raw materials comprise the following components in parts by weight: 10 parts of monocalcium phosphate, 7 parts of calcium chloride, 5 parts of potassium sulfate, 15 parts of chitosan and 5 parts of humic acid.
The preparation method comprises the following steps:
s1, dissolving chitosan in 2wt% acetic acid solution to obtain 1.5mg/mL chitosan solution;
s2, preparing humic acid into a solution to obtain a 0.5mg/mL humic acid solution;
s3, dissolving monocalcium phosphate, calcium chloride and potassium sulfate in water to obtain an active substance solution, wherein the mass percentage concentration of the total substances is 7 wt%;
s4, mixing the chitosan solution and the humic acid solution, uniformly stirring at 300r/min, adding the active substance solution, continuously stirring for 10min, adding genipin, wherein the addition amount is 1wt% of the mass of the system, continuously stirring until the system is in a gel state, dropwise adding a sodium carbonate solution to adjust the pH value to 7.5, curing at normal temperature, drying at low temperature in vacuum, and obtaining the tea garden soil fluorine reducing agent at the temperature of 30 ℃.
Example 2
The raw materials comprise the following components in parts by weight: 20 parts of sodium monohydrogen phosphate, 12 parts of calcium sulfate, 10 parts of potassium sulfate, 20 parts of chitosan and 12 parts of humic acid.
The preparation method comprises the following steps:
s1, dissolving chitosan in a 5wt% acetic acid solution to obtain a chitosan solution of 3 mg/mL;
s2, preparing humic acid into a solution to obtain a 2mg/mL humic acid solution;
s3, dissolving sodium monohydrogen phosphate, calcium sulfate and potassium sulfate in water to obtain an active substance solution, wherein the mass percentage concentration of the total substances is 15 wt%;
s4, mixing the chitosan solution and the humic acid solution, uniformly stirring at 500r/min, adding the active substance solution, continuously stirring for 20min, adding genipin, wherein the addition amount is 2wt% of the mass of the system, continuously stirring until the system is in a gel state, dropwise adding a sodium carbonate solution to adjust the pH value to 8, curing at normal temperature, drying at low temperature in vacuum, and obtaining the tea garden soil fluorine reducing agent at the temperature of 50 ℃.
Example 3
The raw materials comprise the following components in parts by weight: 15 parts of sodium dihydrogen phosphate, 10 parts of calcium nitrate, 7 parts of potassium sulfate, 17 parts of chitosan and 7 parts of humic acid.
The preparation method comprises the following steps:
s1, dissolving chitosan in a 3.5wt% acetic acid solution to obtain a 2mg/mL chitosan solution;
s2, preparing humic acid into a solution to obtain a 1.5mg/mL humic acid solution;
s3, dissolving sodium dihydrogen phosphate, calcium nitrate and potassium sulfate in water to obtain an active substance solution, wherein the mass percentage concentration of the total substances is 12 wt%;
s4, mixing the chitosan solution and the humic acid solution, uniformly stirring at 400r/min, adding the active substance solution, continuously stirring for 15min, adding genipin, wherein the addition amount is 1.5wt% of the mass of the system, continuously stirring until the system is in a gel state, dropwise adding a sodium carbonate solution to adjust the pH value to 7.7, curing at normal temperature, drying at low temperature in vacuum, and obtaining the tea garden soil fluorine reducing agent at the temperature of 40 ℃.
Comparative example 1
Compared with the example 3, the preparation method is that the components are simply mixed to prepare the product, and other conditions are not changed.
Comparative example 2
Compared with example 3, sodium dihydrogen phosphate was not added, and other conditions were not changed.
The raw materials comprise the following components in parts by weight: 25 parts of calcium nitrate, 7 parts of potassium sulfate, 17 parts of chitosan and 7 parts of humic acid.
Comparative example 3
Compared with example 3, no calcium nitrate was added, and other conditions were not changed.
The raw materials comprise the following components in parts by weight: 25 parts of sodium dihydrogen phosphate, 7 parts of potassium sulfate, 17 parts of chitosan and 7 parts of humic acid.
Test example 1
Sampling the fluorine-polluted soil in a fluorine-polluted site, air-drying the soil sample, removing impurities, sieving with a 20-mesh sieve for later use, and analyzing the content of water-soluble fluorine in the soil sample by using an ion selective electrode method. The soil is evenly divided into 7 groups, the fluorine-contaminated soil is repaired by adopting the tea garden soil fluorine reducing agents prepared in examples 1-3 and comparative examples 1-3, and the 7 th group is added with the same amount of non-contaminated soil, wherein the addition amount is 5 wt%. After the soil is maintained and stabilized for 10 days, sampling and analyzing the content of water-soluble fluorine in the soil sample after remediation, and obtaining the experimental results shown in the table 1.
TABLE 1
| Group of | Water soluble fluorine content (mg/kg) | Rate of decrease (%) |
| Control group | 221.2 | / |
| Example 1 | 42.3 | 80.9 |
| Example 2 | 39.5 | 82.1 |
| Example 3 | 35.2 | 84.1 |
| Comparative example 1 | 132.4 | 40.1 |
| Comparative example 2 | 75.7 | 65.8 |
| Comparative example 3 | 82.4 | 62.7 |
The table shows that the tea garden soil fluorine reducing agent prepared by the invention can convert water-soluble fluorine in soil into insoluble substances such as calcium fluorophosphate and the like, and effectively reduces the activity of the fluorine in the soil, thereby reducing the harm of the fluorine and reducing the content of the fluorine in tea leaves.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The tea garden soil fluorine reducing agent is characterized by being prepared from the following raw materials: phosphate fertilizer, calcium salt, potassium sulfate, chitosan and humic acid.
2. The tea garden soil fluorine reducing agent according to claim 1, which is prepared from the following raw materials in parts by weight: 10-20 parts of phosphate fertilizer, 7-12 parts of calcium salt, 5-10 parts of potassium sulfate, 15-20 parts of chitosan and 5-12 parts of humic acid.
3. The tea garden soil fluorine reducing agent according to claim 1, wherein the phosphate fertilizer is at least one selected from the group consisting of calcium monohydrogen phosphate, calcium superphosphate, triple superphosphate, calcium dihydrogen phosphate, calcium phosphate, potassium phosphate, sodium monohydrogen phosphate, potassium dihydrogen phosphate, and sodium dihydrogen phosphate.
4. The tea garden soil fluorine reducing agent according to claim 1, wherein the calcium salt is at least one selected from the group consisting of calcium chloride, calcium sulfate, calcium nitrate and calcium carbonate.
5. The method for preparing the tea garden soil fluorine reducing agent according to any one of claims 1 to 4, characterized by comprising the steps of:
s1, dissolving chitosan in an acetic acid solution to obtain a chitosan solution;
s2, preparing humic acid into a solution to obtain a humic acid solution;
s3, dissolving phosphate fertilizer, calcium salt and potassium sulfate in water to obtain an active substance solution;
s4, mixing the chitosan solution and the humic acid solution, adding the active substance solution after uniformly stirring, continuously stirring for 10-20min, adding genipin, continuously stirring until the system is in a gel state, dropwise adding a sodium carbonate solution to adjust the pH value, curing at normal temperature, and drying at low temperature in vacuum to obtain the tea garden soil fluorine reducing agent.
6. The method according to claim 5, wherein the concentration of the acetic acid solution in step S1 is 2 to 5wt%, and the concentration of the chitosan solution is 1.5 to 3 mg/mL.
7. The method according to claim 5, wherein the concentration of the humic acid solution in step S2 is 0.5-2 mg/mL.
8. The method according to claim 5, wherein the concentration of the total substance in the active material solution in step S3 is 7-15 wt%.
9. The preparation method according to claim 5, wherein the genipin is added in an amount of 1-2wt% based on the mass of the system in step S4; the pH is adjusted to 7.5-8.
10. The method as claimed in claim 5, wherein the stirring speed in step S4 is 300-500 r/min; the temperature of the vacuum low-temperature drying is 30-50 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111577562.9A CN114394870A (en) | 2021-12-23 | 2021-12-23 | Tea garden soil fluorine reducing agent and preparation method thereof |
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| CN106166478A (en) * | 2016-07-26 | 2016-11-30 | 东华大学 | A kind of preparation method of nanometer calcium oxide adsorbent |
| CN107011024A (en) * | 2017-03-10 | 2017-08-04 | 深圳市芭田生态工程股份有限公司 | A kind of promoting root growth promotees the chitosan-containing humic acid liquid fertilizer of fruit |
| CN111961475A (en) * | 2020-08-31 | 2020-11-20 | 中国农业大学 | Slow-release microcapsule type polymer acid soil conditioner and preparation method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106166478A (en) * | 2016-07-26 | 2016-11-30 | 东华大学 | A kind of preparation method of nanometer calcium oxide adsorbent |
| CN107011024A (en) * | 2017-03-10 | 2017-08-04 | 深圳市芭田生态工程股份有限公司 | A kind of promoting root growth promotees the chitosan-containing humic acid liquid fertilizer of fruit |
| CN111961475A (en) * | 2020-08-31 | 2020-11-20 | 中国农业大学 | Slow-release microcapsule type polymer acid soil conditioner and preparation method thereof |
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