CN102513350B - Composition used for treating soil arsenic pollution, and application method thereof - Google Patents
Composition used for treating soil arsenic pollution, and application method thereof Download PDFInfo
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- CN102513350B CN102513350B CN 201110437565 CN201110437565A CN102513350B CN 102513350 B CN102513350 B CN 102513350B CN 201110437565 CN201110437565 CN 201110437565 CN 201110437565 A CN201110437565 A CN 201110437565A CN 102513350 B CN102513350 B CN 102513350B
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Abstract
The invention belongs to the field of soil arsenic pollution treatment. Specifically, the invention relates to a composition used for treating soil arsenic pollution, and an application method thereof. The composition provided by the invention comprises components of, by weight: 20-30% of a pH regulating agent, 10-40% of aluminum oxide, 10-40% of elementary iron, and 15-30% of metal sulfide. The prepared composition is added to arsenic-polluted soil with a dosage of 0.5-4% by weight. With the composition provided by the invention, arsenic in soil can be fixed, and bioavailability of arsenic in soil is substantially reduced. Therefore, arsenic absorption of crops can be inhibited, and crop growth can be promoted. The composition is advantaged in rich raw material, low price, simple preparation method, and simple application method. With the method, large-scale production can easily be realized. The method is suitable for large-range popularization.
Description
Technical field
The invention belongs to arsenic in soil pollution control field, particularly, the present invention relates to a kind of compoistion and method of use for administering the arsenic in soil pollution.
Background technology
The character such as that the compound of arsenic has is carcinogenic, teratogenesis, mutagenesis.Arsenic poisoning is take skin as main systemic disease, the skin that it can harmful to human, breathing, digestion, uropoiesis, cardiovascular, neural, hemopoietic system etc.Because exploitation, the use that contains the arsenic agriculture chemical, metal smelt and the mining of arsenic contamination underground water cause a large amount of soils of China serious arsenic contamination to occur.Arsenic in the soil environment enters human body by food, drinking water and breathing, and surpassing limits the quantity of can cause human body arsenic poisoning.Arsenic contamination and arsenic poisoning event all appearred in the ground such as China Hunan, Guangxi, Yunnan in recent years, and the arsenic in soil pollution problem has become one of important environmental problem of China.
At present, the improvement of As polluted soil has become the study hotspot problem of various countries.To administer one of effective technology means that arsenic in soil pollutes and the arsenic in the As polluted soil is carried out stabilization processes.
Application number a kind of method for the treatment of As polluted soil that has been 200510136982.8 patent disclosure can make arsenic compound (organic form or trivalent or pentavalent inorganic form) not dissolve, and makes thus their leaching degree be lower than the environmental standard value.Described method is: As polluted soil is 200-700 ℃ of lower heating, and then the soil after the heating mixes with calcium compound and water again, reaches the purpose of fixing soil arsenic.The method need to be heated to contaminated soil 200-700 ℃, and energy consumption is too high, greatly increases the cost of administering.
Application number is 200910272496.7 patent disclosure a kind of chemical fixing material that is applicable to the arsenic in the fixing soil and uses thereof, the chemical fixing material of this invention preparation can effectively carry out the fixedly processing of arsenic to the deposit of As polluted soil, arsenic contamination and the mine tailing of arsenic contamination etc., reduce its biological effectiveness, suppress crops to absorption and the accumulation of arsenic.But this invention prepares more complicated take the sharp attitude type of nanometer titanium dioxide, nm-class rutile-type TiO 2, zeroth order iron powder as solid material, and cost of material is higher, is not suitable for large-area applying.
Application number a kind of method of administering As polluted soil that has been 201010204184.5 patent disclosure, the method is to add iron salt solutions in As polluted soil, so that iron salt solutions and arsenic reaction, forms the arsenate FeAsO of iron
3Or FeAsO
4Thereby, reach the purpose of fixing soil arsenic.But iron salt solutions is convenient not in the use, and its growth on agricultural land soil physicochemical property and crops also can cause bad impact.
Therefore, be necessary to provide a kind of composition that the improvement arsenic in soil prior art deficiency, novel pollutes that overcomes.
Summary of the invention
Purpose of the present invention aims to provide a kind of environmental friendliness, expense is low, do not affect the chemical stabilization method of plough producing and can promote plant growth, make in the agricultural land soil of arsenic contamination and grow safe agricultural product, thereby realize recovering the target of the ecological functions of contaminated land.
Therefore, first aspect the invention provides a kind of composition for administering the arsenic in soil pollution, and described composition comprises following each composition:
PH value conditioning agent;
Aluminum oxide
Fe;
Metal sulfide.
In the composition of first aspect, described pH value conditioning agent can be in calcium carbonate, calcium hydroxide and the calcium oxide one or more.
In the composition of first aspect, described aluminum oxide can be in red mud, bauxite residue, gangue and the flyash one or more.
In the composition of first aspect, described fe comprises iron filings.
In the composition of first aspect, described metal sulfide can be in vulcanized sodium, calcium sulfide, the calcium polysulfide one or more.Calcium polysulfide is class general designation, and molecular formula is CaSx, and x is take 5 as common.
In the composition of first aspect, the weight percent content of each composition is:
PH value conditioning agent 20%-30%;
In the composition of first aspect, can also comprise fertilizer.In comprising the embodiment of fertilizer, the weight percent content of each composition is:
PH value conditioning agent 20%-30%;
Fertilizer 5%-15%.
In one embodiment, described composition can form by evenly being mixed with after each composition is pulverized.In one embodiment, the fineness of each composition is the 80-100 order.
Second aspect the invention provides a kind of using method for administering the composition that arsenic in soil pollutes, and comprises the steps:
(1) described composition is spread on the surface of As polluted soil equably;
(2) described composition is evenly mixed with As polluted soil;
(3) water is sprayed onto in the As polluted soil that is mixed with described composition and evenly mixing.
In the method for the invention, the consumption of the composition in the step (1) is the 0.5%-4% of the weight of As polluted soil, and wherein the weight of As polluted soil is that the unit weight that volume by As polluted soil multiply by As polluted soil calculates.
In the method for the invention, the consumption of the water in the step (3) is so that the moisture content of soil is the amount of 30%-40%.
In the method for the invention, when described composition used in the farmland, the even mixing in step (2) and the step (3) was by using agricultural machinery with the As polluted soil realization of turning over.
The third aspect the invention provides the purposes of composition of the present invention in administering agricultural land soil arsenic contamination, industrial place soil arsenic contamination and mine tailing arsenic contamination.
Composition of the present invention mainly is the different efficacies of utilizing various compositions, by their synergy, reaches the effect of stable soil arsenic.
Particularly, pH value conditioning agent not only can improve the pH value of soil so that the soil surface negative electrical charge increases, thereby so that soil the compatibility of heavy metal is increased, and heavy metal also had certain passivation, its calcium salt can generate stable calcium arsenate with arsenic.
Because aluminum oxide contains the surface-active site, so the arsenic in the soil can be combined with aluminum oxide, and heavy metal is fixed, thereby forms the aluminum oxide that is difficult to be absorbed by plants in conjunction with attitude arsenic.In other words, the mobility of arsenic in soil is subject to the control of aluminum oxide.Therefore, arsenic enters another important channel that the aluminum oxide lattice is curing/stabilizing arsenic.
In the industrial materials such as red mud, bauxite residue, gangue and flyash, all contain a certain amount of aluminum oxide, therefore, in actual applications, can adopt above-mentioned industrial materials as the component in the composition of the present invention's proposition.Particularly, for example, bauxite is a kind of ore take aluminium oxide as chief component, and the alumyte flotation tailings slag is the residue that produces in the bauxite aluminium floatation process processed, contains a certain amount of aluminum oxide, has the effect of good absorption and firm arsenic.For example, the waste residue of discharging when red mud is aluminium industry extraction aluminium oxide, the aluminum oxide weight percentage of red mud is 15%-20%.
After iron compound enters soil, by the arsenic in suction-operated or the co-precipitation stabilisation soil, the AsO in the soil
4 3-And AsO
3 3-Easy and Fe generates the precipitation compound of indissoluble, and this is the dominant mechanism that iron powder is stablized arsenic.
Calcium sulfide, calcium polysulfide, vulcanized sodium etc. can form the arsenones precipitation with unsettled arsenate, arsenones be arsenic element at the modal mineral crystal of occurring in nature, i.e. realgar, can be in larger Acidity Range stable existence.Simultaneously, the adding of lime stone can the establishment hydrogen ion and sulphion produce hydrogen sulfide gas, thereby effectively avoided the problem of secondary pollution.
The present invention compared with prior art has following advantage at least:
(1) the present invention is take common industrial raw material or waste material as main material, they all have wide material sources, with low cost, easy to use, the preparation method is simple, is easy to realize large-scale production, thereby can be by wide popularization and application.
(2) the present invention has improved stabilisation efficient, and the composition of developing can effectively reduce available state arsenic content, reduces environmental risk, does not produce secondary pollution simultaneously.
(3) composition of the present invention's development can be administered soil pollution, can promote crop growth again.
Description of drawings
Above-mentioned and/or the additional aspect of the present invention and advantage are from obviously and easily understanding becoming the description of embodiment below in conjunction with accompanying drawing, wherein:
Fig. 1 is for using the present composition to process the block diagram of the leaching quantitative change of front and back arsenic in soil;
Fig. 2 is that the present composition is to the block diagram of the affects on the growth of rapeseed plants;
Fig. 3 is that the present composition is on the block diagram of the impact of arsenic content in the rapeseed plants.
The specific embodiment
Below by embodiment the present invention is described in further details, below each embodiment only be used for explanation the present invention rather than restriction the present invention.
The preparation of embodiment 1 present composition
Composition 1
Each composition is pulverized, mixed, cross 80 mesh sieves, make composition 1 of the present invention.
Composition 2
Each composition is pulverized, mixed, cross 80 mesh sieves and make composition 2 of the present invention.
Composition 3
Each composition is pulverized, mixed, cross 80 mesh sieves and make composition 3 of the present invention.
Composition 4
Each composition is pulverized, mixed, cross 100 mesh sieves and make composition 4 of the present invention.
Composition 5
Each composition is pulverized, mixed, cross 80 mesh sieves and make composition 5 of the present invention.
Embodiment 2
I. use the present composition to process the variation of the leaching amount of front and back arsenic in soil
A) experiment source and the processing thereof of soil
Experiment with soil from Tianjin Dongli District agricultural land soil, through air-dry, grind broken after, cross 20 purpose nylon mesh, arsenic contamination is by the artificial outer Na that adds
3AsO
4.12H
2O is formulated, and the level that arsenic in soil pollutes is 75mg/kg.Balance one month.
B) do not use the present composition to process the leaching amount (contrast) of front arsenic in soil
The As polluted soil of weighing apparatus after one month of making even applies an amount of water in soil, making the moisture content of soil is 30%-40%, and soil is mixed, and shelves (shelving 2 days) to be analyzed.
Carry out the leaching experiment of arsenic in soil.The method of wherein measuring the leaching amount of arsenic in soil is: method-" the solid waste Leaching leaching method sulfuric acid nitrate method " of pointing out in (GB5085.3-2007) according to " hazardous waste judging standard leaching characteristic identification " (HJ/T299-2007) prepares leachate, concrete grammar is, be that 2: 1 the concentrated sulfuric acid and red fuming nitric acid (RFNA) mixed liquor joins in the deionized water with mass ratio, make pH be about 3.20 ± 0.05, be that 10: 1 pairs of As polluted soils carry out lixiviate according to liquid-solid mass ratio, and in turnover oscillator with rotating speed 30r/min, shook 18 hours.Extract leachate with zero fixed empty extractor (Zero-Headspace ExtractionVessel is called for short ZHE), leachate is measured with atomic fluorescence spectrophotometer (AFS-9130, lucky day of Beijing) according to " GB/T 22105.2-2008 soil quality total mercury, total arsenic, total plumbous mensuration atomic fluorescence method ".
C) use the present composition to process the leaching amount of rear arsenic in soil
The As polluted soil 2000g of weighing apparatus after one month that make even adds respectively the composition 1-5 of preparation among the embodiment 1 with the amount of 4% (w/w).Regulating soil moisture content is the moisture condition of 30%-40%, and soil is mixed, and shelves (shelving 2 days) to be analyzed.
Carry out the leaching experiment of arsenic in soil.The method of wherein measuring the leaching amount of arsenic in soil is: method-" the solid waste Leaching leaching method sulfuric acid nitrate method " of pointing out in (GB5085.3-2007) according to " hazardous waste judging standard leaching characteristic identification " (HJ/T299-2007) prepares leachate, concrete grammar is, be that 2: 1 the concentrated sulfuric acid and red fuming nitric acid (RFNA) mixed liquor joins in the deionized water with mass ratio, make pH be about 3.20 ± 0.05, be that 10: 1 pairs of As polluted soils carry out lixiviate according to liquid-solid mass ratio, and in turnover oscillator with rotating speed 30r/min, shook 18 hours.Extract leachate with zero fixed empty extractor (Zero-Headspace ExtractionVessel is called for short ZHE), leachate is measured with atomic fluorescence spectrophotometer (AFS-9130, lucky day of Beijing) according to " GB/T 22105.2-2008 soil quality total mercury, total arsenic, total plumbous mensuration atomic fluorescence method ".
The leaching amount of using the present composition to process the front and back arsenic in soil the results are shown in following table 1 and Fig. 1.
D) result
Table 1
| Arsenic leaching amount (mg/L) (mean value ± SD) | |
| Contrast | 0.96±0.04 |
| Composition 1 | 0.048±0.018 |
| Composition 2 | 0.017±0.008 |
| Composition 3 | 0.017±0.005 |
| Composition 4 | 0.002±0.001 |
| Composition 5 | 0.041±0.009 |
Can find that composition of the present invention can obviously reduce the leaching of Arsenic in Soil in this experiment, and optimum with composition 4 effects.Domestic Correlative Standard comprises: the content standard of arsenic is that nonirrigated farmland irrigation water arsenic concentration is lower than 0.1mg/L in " agricultural irrigation water quality standard GB5084-2005 ", and paddy field and vegetable fields are lower than 0.05mg/L; Three class underground water standards are (take the health a reference value as foundation in " Groundwater Environmental Quality standard GB/T14848-93 ".Mainly be applicable to centralized Drinking Water water source and worker, agricultural water.) in the regulation arsenic concentration be lower than 0.05mg/L, regulation one class water quality arsenic standard is 0.05mg/L in " water environment quality standard GB3838-2002 ".Therefore, composition 1,2,3,4,5 can be effectively reduces the Leaching of arsenic and makes arsenic leaching amount be lower than national standard.So the present invention is the arsenic in the stable soil fast and efficiently, be used for the improvement reparation of arsenic soil pollution.
II. the present composition is to arsenic content and affects on the growth thereof in the rapeseed plants
A) experiment source and the processing thereof of soil
Experiment with soil from Tianjin Dongli District agricultural land soil, through air-dry, grind broken after, cross 20 purpose nylon mesh, arsenic contamination is by the artificial outer Na that adds
3AsO
4.12H
2O is formulated, and the level that arsenic in soil pollutes is 75mg/kg.Balance one month.
Arsenic content and fresh weight (contrast) when b) not using the present composition to process in the rapeseed plants
Step 1, the As polluted soil packing of weighing apparatus after one month of making even, every basin 2.5kg soil carries out potted plant experiment.
Step 2: in soil, add an amount of water, make soil moisture content remain on 30%-40%, soil is mixed.
Step 3: the field planting of crop and growth: experimental period is July, with rapeseed cultivation in the soil that step 2 is processed, thinning after the week, every basin keeps 4 strains.Experimental session is grown and was taken a sample afterwards in 35 days according to weather and plant growth situation regular watering.
Step 4: the arsenic content in the rape and the measurement result of single-strain fresh weight such as following table 2 and Fig. 2, shown in Figure 3.After the rape results, rinse well with running water, then clean with deionized water, install with sample sack.Single-strain fresh weight directly uses centesimal balance to measure.Bright sample completed under 80 ℃ 1 hour, and then 65 ℃ of lower oven dry, levigate, sealing is for analyzing.Arsenic content adopts HNO in the rape
3-HClO
4Digestion: accurately take by weighing the 0.5000g sample in 100ml digestion bottle, add respectively dense HNO
310ml and HClO
42ml does simultaneously 1 part of blank sample and is used for the experimentation quality control, places heating and decompose on the electric hot plate, generally digests to become clarification to sample and get final product, and cooled disappearing boiled liquid and washed carefully in the 50ml volumetric flask with deionized water, and water should be on a small quantity repeatedly when rushing Xian.Shake gently volumetric flask, after cooling off fully, the water constant volume.Use Filter paper filtering, filtrate is received in the plastic bottle of 100ml drying for subsequent use again, thereafter filtrate is carried out the mensuration of arsenic, and sample arsenic content is that the sample determination value deducts the blank sample measured value.The assay method of arsenic adopts " GB/T 22105.2-2008 soil quality total mercury, total arsenic, total plumbous mensuration atomic fluorescence method " atomic fluorescence spectrophotometer (AFS-9130, lucky day of Beijing).
Table 2
C) arsenic content and fresh weight after the use present composition is processed in the rapeseed plants
Step 1, the As polluted soil packing of weighing apparatus after one month of making even, every basin 2.5kg soil carries out potted plant experiment.
Step 2: it is for subsequent use to form the composition 1 and the composition 4 that prepare respectively 100g with reference to the prescription among the embodiment 1.Amount by 4% (w/w) and 2% (w/w) is applied to composition 1 and composition 4 in the soil of arsenic contamination respectively.Wherein to apply the amount of composition 1 be 100g to every basin, and the amount that applies composition 4 is 50g, mixes with soil, then adds an amount of water in soil, makes soil moisture content remain on 30%-40%, and mixed soil mixes soil.
Step 3: the field planting of crop and growth: experimental period is July, with rapeseed cultivation in the soil that step 2 is processed, thinning after the week, every basin keeps 4 strains.Experimental session is grown and was taken a sample afterwards in 35 days according to weather and plant growth situation regular watering.
Step 4: the arsenic content in the rape and the measurement result of fresh weight such as following table 3 and Fig. 2, shown in Figure 3.After the rape results, rinse well with running water, then clean with deionized water, install with sample sack.Single-strain fresh weight directly uses centesimal balance to measure.Bright sample completed under 80 ℃ 1 hour, and then 65 ℃ of lower oven dry, levigate, sealing is for analyzing.Arsenic content adopts HNO in the rape
3-HClO
4Digestion: accurately take by weighing the 0.5000g sample in 100ml digestion bottle, add respectively dense HNO
310ml and HClO
42ml does simultaneously 1 part of blank sample and is used for the experimentation quality control, places heating and decompose on the electric hot plate, generally digests to become clarification to sample and get final product, and cooled disappearing boiled liquid and washed carefully in the 50ml volumetric flask with deionized water, and water should be on a small quantity repeatedly when rushing Xian.Shake gently volumetric flask, after cooling off fully, the water constant volume.Use Filter paper filtering, filtrate is received in the plastic bottle of 100ml drying for subsequent use again, thereafter filtrate is carried out the mensuration of arsenic, and sample arsenic content is that the sample determination value deducts the blank sample measured value.The assay method of arsenic adopts " GB/T 22105.2-2008 soil quality total mercury, total arsenic, total plumbous mensuration atomic fluorescence method " atomic fluorescence spectrophotometer (AFS-9130, lucky day of Beijing).
Table 3
Experimental result shows energy stable soil arsenic when the present composition 1 is used by the amount of 4% (w/w), makes rape overground part arsenic concentration be reduced to 0.20mgkg
-1, average specific contrast (0.52mgkg
-1) reduce nearly 61.5%.Can promote simultaneously the growth of rape, fresh weight contrast fresh weight has increased by 23%.
The present composition 4 can make rape overground part arsenic concentration be reduced to 0.15mgkg when using by the amount of 2% (w/w)
-1, average specific contrast (0.52mgkg
-1) reduce nearly 71.2%.Can promote simultaneously the growth of rape, fresh weight contrast fresh weight has increased by 13%.
More than part preferred embodiment of the present invention is described.Should be pointed out that for those skilled in the art under the prerequisite that does not break away from the principle of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (11)
1. one kind is used for administering the composition that arsenic in soil pollutes, and described composition comprises following each composition:
PH value conditioning agent;
Aluminum oxide;
Fe;
Metal sulfide;
Wherein,
The weight percent content of each composition is:
PH value conditioning agent 20%-30%;
Aluminum oxide 10%-40%;
Fe 10%-40%;
Metal sulfide 15%-30%;
Described pH value conditioning agent is one or more in calcium carbonate, calcium hydroxide and the calcium oxide;
Described metal sulfide is one or more in vulcanized sodium, calcium sulfide, the calcium polysulfide.
2. composition according to claim 1, wherein said aluminum oxide is one or more in red mud, bauxite residue, gangue and the flyash.
3. composition according to claim 1, wherein said fe comprises iron filings.
4. composition according to claim 1 also comprises fertilizer.
5. composition according to claim 4, wherein the weight percent content of each composition is:
PH value conditioning agent 20%-30%;
Aluminum oxide 10%-40%;
Fe 10%-40%;
Metal sulfide 15%-30%;
Fertilizer 5%-15%.
6. according to claim 1 to 5 each described compositions, wherein said composition forms by evenly being mixed with after each composition is pulverized.
7. composition according to claim 6, wherein the fineness of each composition is the 80-100 order.
8. according to claim 1 to the using method of 7 each described compositions, comprise the steps:
(1) described composition is spread on the surface of As polluted soil equably;
(2) described composition is evenly mixed with As polluted soil;
(3) water is sprayed onto in the As polluted soil that is mixed with described composition and evenly mixing.
9. method according to claim 8, the consumption of the composition in the step (1) is the 0.5%-4% of the weight of As polluted soil, wherein the weight of As polluted soil is that the unit weight that volume by As polluted soil multiply by As polluted soil calculates; The consumption of the water in the step (3) is so that the moisture content of soil is the amount of 30%-40%.
10. method according to claim 8, the even mixing in step (2) and the step (3) is by using agricultural machinery with the As polluted soil realization of turning over.
11. the purposes of each described composition in administering agricultural land soil arsenic contamination, industrial place soil arsenic contamination and mine tailing arsenic contamination according to claim 1-7.
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| CN103286123B (en) * | 2013-05-21 | 2014-07-30 | 江苏上田环境修复有限公司 | Process for treating heavy metal contaminated soil |
| CN103551374A (en) * | 2013-09-24 | 2014-02-05 | 曾敏 | Method for restoring rice field with middle and light level arsenic pollution |
| JP6438888B2 (en) * | 2013-10-28 | 2018-12-19 | 吉野石膏株式会社 | Insolubilizing material for specified hazardous substances and method for insolubilizing specified hazardous substances using the same |
| CN104072093A (en) * | 2014-06-30 | 2014-10-01 | 张家港格林台科环保设备有限公司 | Preparation of arsenic oxide building material and recycling application of arsenic desorbing liquid |
| CN105419810A (en) * | 2015-10-30 | 2016-03-23 | 云南省农业科学院质量标准与检测技术研究所 | Soil conditioner for reducing content of arsenic in panax notoginseng, method for preparing soil conditioner and application thereof |
| CN105757705A (en) * | 2016-01-19 | 2016-07-13 | 太原科技大学 | Method for restraining arsenic release of coal gangue in combustion electricity generation process |
| CN105969364A (en) * | 2016-06-06 | 2016-09-28 | 福建省农业科学院土壤肥料研究所 | Composite heavy metal passivator containing secondary reduction iron powder and use method of passivator |
| CN106244157A (en) * | 2016-07-27 | 2016-12-21 | 广东开源环境科技有限公司 | The renovation agent of a kind of heavy-metal contaminated soil, preparation method and applications |
| CN111100646A (en) * | 2018-10-26 | 2020-05-05 | 南京化学工业园环保产业协同创新有限公司 | Heavy metal stabilizer for soil acidity and alkalinity improvement |
| CN110144224A (en) * | 2019-05-22 | 2019-08-20 | 大连理工大学 | A kind of iron sulphur compounding passivation medicament and application suitable for repairing agricultural land soil arsenic and cadmium combined pollution |
| CN112496020A (en) * | 2020-10-30 | 2021-03-16 | 煜环环境科技有限公司 | Restoration method for reducing effective state of heavy metal in farmland soil |
| CN113058993B (en) * | 2021-04-08 | 2023-09-05 | 中铝环保节能集团有限公司 | Repairing agent for repairing lead, arsenic and cadmium combined polluted soil and repairing method thereof |
| CN113578944A (en) * | 2021-07-27 | 2021-11-02 | 暨南大学 | Method for detecting arsenic leaching toxicity in arsenic-polluted soil |
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| US6843617B2 (en) * | 1998-06-18 | 2005-01-18 | Rmt, Inc. | Stabilization of toxic metals in a waste matrix and pore water |
| CN100465137C (en) * | 2007-01-10 | 2009-03-04 | 南京大学 | Regulation and control agent in use for treating soil polluted by heavy metals |
| JP5448380B2 (en) * | 2008-07-17 | 2014-03-19 | 株式会社大林組 | Arsenic-contaminated soil treatment material |
| CN102233354A (en) * | 2010-05-06 | 2011-11-09 | 中国科学院生态环境研究中心 | Remediation method of arsenic (As)-contaminated soil |
| CN101879521A (en) * | 2010-06-11 | 2010-11-10 | 中国地质大学（北京） | Method for remedying arsenic polluted soil |
| CN102101123B (en) * | 2011-03-10 | 2012-03-21 | 刘阳生 | In-situ restoration method for heavy metal polluted soil |
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