CN115058251A - Composite agent for repairing heavy metal arsenic and cadmium in acid paddy field and repairing method - Google Patents
Composite agent for repairing heavy metal arsenic and cadmium in acid paddy field and repairing method Download PDFInfo
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- CN115058251A CN115058251A CN202210997872.4A CN202210997872A CN115058251A CN 115058251 A CN115058251 A CN 115058251A CN 202210997872 A CN202210997872 A CN 202210997872A CN 115058251 A CN115058251 A CN 115058251A
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- 229910052785 arsenic Inorganic materials 0.000 title claims abstract description 50
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 title claims abstract description 49
- 229910052793 cadmium Inorganic materials 0.000 title claims abstract description 45
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 27
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 22
- 239000002131 composite material Substances 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000002253 acid Substances 0.000 title claims abstract description 12
- 239000002689 soil Substances 0.000 claims abstract description 60
- 150000001875 compounds Chemical class 0.000 claims abstract description 23
- 239000003337 fertilizer Substances 0.000 claims abstract description 21
- 239000003814 drug Substances 0.000 claims abstract description 19
- 230000035558 fertility Effects 0.000 claims abstract description 17
- 238000002161 passivation Methods 0.000 claims abstract description 14
- 239000003349 gelling agent Substances 0.000 claims abstract description 12
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000000440 bentonite Substances 0.000 claims abstract description 9
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 9
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000011790 ferrous sulphate Substances 0.000 claims abstract description 9
- 235000003891 ferrous sulphate Nutrition 0.000 claims abstract description 9
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims abstract description 9
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims abstract description 9
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 9
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 9
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical group [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000003895 organic fertilizer Substances 0.000 claims abstract description 9
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 9
- 239000010703 silicon Substances 0.000 claims abstract description 9
- 239000003331 fertility enhancer Substances 0.000 claims abstract description 3
- 241000209094 Oryza Species 0.000 claims description 29
- 235000007164 Oryza sativa Nutrition 0.000 claims description 29
- 235000009566 rice Nutrition 0.000 claims description 29
- 230000002378 acidificating effect Effects 0.000 claims description 5
- 239000003623 enhancer Substances 0.000 claims description 5
- 238000003971 tillage Methods 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 239000003153 chemical reaction reagent Substances 0.000 claims description 2
- 230000006872 improvement Effects 0.000 abstract description 9
- 230000008439 repair process Effects 0.000 abstract description 3
- 235000013339 cereals Nutrition 0.000 description 7
- 238000001514 detection method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- APAWRDGVSNYWSL-UHFFFAOYSA-N arsenic cadmium Chemical compound [As].[Cd] APAWRDGVSNYWSL-UHFFFAOYSA-N 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000002440 industrial waste Substances 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 235000010755 mineral Nutrition 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000001988 toxicity Effects 0.000 description 2
- 231100000419 toxicity Toxicity 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 150000001450 anions Chemical group 0.000 description 1
- 230000003042 antagnostic effect Effects 0.000 description 1
- 230000008485 antagonism Effects 0.000 description 1
- VETKVGYBAMGARK-UHFFFAOYSA-N arsanylidyneiron Chemical compound [As]#[Fe] VETKVGYBAMGARK-UHFFFAOYSA-N 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001768 cations Chemical group 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000003446 ligand Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 235000015816 nutrient absorption Nutrition 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 239000002574 poison Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005067 remediation Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- 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
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
- A01B79/00—Methods for working soil
- A01B79/02—Methods for working soil combined with other agricultural processing, e.g. fertilising, planting
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G22/00—Cultivation of specific crops or plants not otherwise provided for
- A01G22/20—Cereals
- A01G22/22—Rice
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D5/00—Fertilisers containing magnesium
-
- 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
- C09K2101/00—Agricultural use
-
- 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
- C09K2109/00—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE pH regulation
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Environmental Sciences (AREA)
- Inorganic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Botany (AREA)
- Environmental & Geological Engineering (AREA)
- Pest Control & Pesticides (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Fertilizers (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention discloses a composite medicament for repairing heavy metal arsenic and cadmium in acid paddy fields and a repairing method, wherein the composite medicament comprises the following components in parts by weight: passivation conditioners, gelling agents and fertilizing agents; wherein, the passivation conditioner comprises agricultural ferrous sulfate and bentonite, the gelling agent is magnesium oxide, and the fertility enhancer comprises a silicon fertilizer, an organic fertilizer and a compound fertilizer. The composite agent disclosed by the invention can reduce the bioavailability of arsenic and cadmium, can increase the fertility of soil, and can complete the improvement of the fertility of soil while repairing arsenic and cadmium; the composite agent can repair arsenic and cadmium simultaneously, has simple components and wide sources, and is convenient for farmers to apply and use by themselves.
Description
Technical Field
The invention relates to the technical field of farmland restoration, in particular to a compound agent for restoring heavy metal arsenic and cadmium in an acid paddy farmland and a restoration method.
Background
The main pollutants in the farmland soil are cadmium, nickel, copper, arsenic and the like, the excessive cadmium in the farmland soil can poison crops and reduce the yield of the crops on the one hand, and the cadmium can be absorbed by the crops, enriched in grains, enter a food chain and then enter a human body and damage the human body on the other hand. After the arsenic pollution reaches a certain degree, the growth and development of the rice can be obviously inhibited, so that the yield of the rice is reduced, and even no yield is obtained. As the rice field is in a flooded anaerobic reduction state for a long time, the arsenic has relatively high biological effectiveness, so that the rice is more easily affected by arsenic pollution compared with other crops, and the rice grains polluted by arsenic exceed the standard, so that the rice grains are harmful to the human health and influence the grain safety of China.
Soil acidification of farmland can cause soil hardening, soil pores are reduced, effectiveness of heavy metals in soil is improved, nutrient absorption of crops is reduced, and growth, development and quality of crops are affected. The currently common farmland restoration method is an in-situ passivation restoration method, and the migration capacity and the bioavailability of heavy metals in soil are reduced by adding a passivating agent into farmland soil and utilizing the effects of adsorption, precipitation and the like of the passivating agent and the heavy metals. In practical application, the acidity of the soil can be effectively reduced by applying lime, but the soil is hardened by frequent application; the content of calcium, magnesium and the like in the soil can be increased by applying minerals, but the organic fertility is not supplemented; the application of industrial wastes such as steel slag, fly ash and the like can reduce the acidity of the soil and increase the content of calcium, magnesium and the like in the soil, but the industrial wastes contain high heavy metals, so that the risk of heavy metal pollution to farmland soil can be caused.
In farmland improvement and restoration, cadmium exists in a cation form and has a tendency of losing electrons, and arsenic mainly exists in an anion form and has a tendency of obtaining electrons due to the relative chemical properties of cadmium and arsenic; due to the difference, the arsenic and cadmium pollution in the rice field with arsenic and cadmium combined pollution has antagonistic effect on treatment, so that the control of the arsenic and cadmium pollution in rice grains is difficult.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a composite medicament for repairing heavy metal arsenic and cadmium in acid paddy fields and a repairing method.
The invention discloses a composite reagent for repairing heavy metal arsenic and cadmium in acid paddy fields, which comprises the following components: passivation conditioners, gelling agents and fertility enhancers; wherein,
the passivation conditioner comprises agricultural ferrous sulfate and bentonite, the gelling agent is magnesium oxide, and the fertility enhancer comprises a silicon fertilizer, an organic fertilizer and a compound fertilizer.
As a further improvement of the invention, the addition amount of the agricultural ferrous sulfate is 1-2 per mill of the mass of the soil to be repaired, and the addition amount of the bentonite is 1-3 percent of the mass of the soil to be repaired.
As a further improvement of the invention, the addition amount of the magnesium oxide is 1-3 per mill of the quality of the soil to be repaired.
As a further improvement of the invention, the adding amount of the silicon fertilizer is 1-2 per mill of the quality of the soil to be repaired; the adding amount of the organic fertilizer is 0.75-1% of the mass of the soil to be repaired, and the adding amount of the compound fertilizer is 0.4-0.8 per mill of the mass of the soil to be repaired.
As a further improvement of the invention, the pH value of the compound medicament applicable to the soil to be repaired is between 4 and 6.
The invention also discloses a method for repairing heavy metal arsenic and cadmium in acid paddy farmland, which comprises the following steps:
uniformly mixing a passivation conditioner, a gelling agent and a fertilizer enhancer according to a preset proportion to obtain the composite medicament;
putting the composite agent into a rice farm field;
carrying out rotary tillage on the soil layer of 0-20cm by using a rotary cultivator to ensure that the compound agent is fully mixed with the soil of the paddy field for reaction;
after reacting for 3-5 days, planting and reasonably managing the rice field according to local rice planting habits.
Compared with the prior art, the invention has the beneficial effects that:
the composite agent disclosed by the invention can reduce the bioavailability of arsenic and cadmium, can increase the fertility of soil, and can complete the improvement of the fertility of soil while repairing arsenic and cadmium; the composite agent can repair arsenic and cadmium simultaneously, has simple components and wide sources, and is convenient for farmers to apply and use by themselves.
Drawings
FIG. 1 is a flow chart of a remediation method for remediating heavy metal arsenic and cadmium in acidic paddy fields, which is disclosed by an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The invention is described in further detail below with reference to the attached drawing figures:
because arsenic and cadmium have relative properties and have antagonism, it is difficult to be repaired at the same time, the invention provides a compound medicament capable of repairing heavy metal arsenic and cadmium in acid paddy field at the same time, the compound medicament is suitable for the paddy field with pH of 4-6 and medium-light pollution; it comprises the following steps: passivation conditioners, gelling agents and fertility enhancers; wherein,
the passivation conditioner comprises agricultural ferrous sulfate and bentonite, wherein the addition amount of the agricultural ferrous sulfate is 1-2 per mill of the mass of the soil to be repaired, and the addition amount of the bentonite is 1-3 percent of the mass of the soil to be repaired.
The gelling agent is magnesium oxide, and the addition amount of the magnesium oxide is 1-3 per mill of the mass of the soil to be repaired.
The fertility intensifier comprises a silicon fertilizer, an organic fertilizer and a compound fertilizer, wherein the adding amount of the silicon fertilizer is 1-2 per mill of the mass of the soil to be restored; the adding amount of the organic fertilizer is 0.75-1% of the mass of the soil to be repaired, and the adding amount of the compound fertilizer is 0.4-0.8 per mill of the mass of the soil to be repaired.
Furthermore, each component in the compound medicament is a solid powdery medicament.
Furthermore, the contents of heavy metals such as cadmium, mercury, lead, chromium and arsenic in the components of the composite medicament do not exceed the screening values specified in GB 15618-.
As shown in FIG. 1, the invention provides a method for repairing heavy metal arsenic and cadmium in acidic paddy fields, which comprises the following steps:
s1, uniformly mixing the passivation conditioner, the gelling agent and the fertility intensifier according to a preset proportion to obtain the composite medicament;
s2, putting the composite agent into a rice farmland;
s3, carrying out rotary tillage on a 0-20cm soil layer by using a rotary cultivator to ensure that the compound agent is fully mixed with the paddy field soil for reaction;
and S4, after reacting for 3-5 days, planting and reasonably managing the rice field according to local rice planting habits.
Example (b):
the method is used for passivating and repairing 81.79 mu of paddy field soil polluted by arsenic and cadmium in Jian city in Jiangxi, and the detection results of original samples are as follows:
TABLE 1 arsenic and cadmium content in rice field soil
TABLE 2 arsenic and cadmium content of rice seeds
TABLE 3 soil fertility chart
The method for restoring the rice field comprises the following steps:
firstly, cleaning up a paddy field; then 1 per thousand of ferrous sulfate, 1.1 percent of bentonite, 1 per thousand of magnesium oxide, 0.75 percent of organic fertilizer, 1 per thousand of silicon fertilizer and 0.4 per thousand of compound fertilizer are added into each mu of the fertilizer, and the medicines are prepared and uniformly mixed, and are all in powder shape; the mixed medicament is put into the paddy field in a manual spreading mode, after all the mixed medicament is added, a rotary cultivator is used for rotary tillage on 0-20cm of soil, and the medicament and the soil are fully mixed and react. After reacting for 3-5 days, planting and reasonably managing the rice according to the local rice (rice variety Xinyou 188) planting habit.
After the rice is mature, according to an effect evaluation point distribution principle in the evaluation criterion of arable land pollution treatment effect (NY/T3343-2018), 10 samples are collected from farmland soil and rice at corresponding point positions, each sample is sampled according to a 5-point sampling method, 5-point samples are uniformly mixed to serve as a sample, and a central point serves as a sample number. The soil arsenic-cadmium effective state and the content of arsenic and cadmium in rice grains are detected, and the result is as follows:
TABLE 4 available states of As and Cd in soil samples
According to the detection results, the average decrease rate of the content of the available arsenic and cadmium in the farmland soil after the mixed medicament is added reaches more than 20 percent.
TABLE 5 Rice Kernel arsenic cadmium content (mg/kg)
According to the detection results, all the rice grain samples reach the standard.
TABLE 6 soil fertility chart after restoration
The above table shows that the various indexes of the soil fertility are all improved after the mixed medicament is applied.
The repairing principle of the invention is as follows:
the agricultural ferrous sulfate can form iron-arsenic minerals with heavy metal arsenic to reduce the toxicity of the heavy metal arsenic, and aluminum octahedron contained in bentonite can form an inner-layer ligand structure with arsenic and cadmium to adsorb the heavy metal arsenic and cadmium, so that the biological toxicity of the arsenic and cadmium is reduced, and the pH value of soil can be adjusted.
The invention selects magnesium oxide as the gelling agent, so that the passivation conditioner can be better combined with heavy metal to form more stable precipitate.
The silicon fertilizer can play a role in preventing and controlling the rice from absorbing arsenic, and can increase the yield of the rice; the compound fertilizer and the organic fertilizer can increase the soil fertility and prevent the soil fertility from being attenuated due to the addition of the passivation conditioner.
The invention has the advantages that:
the composite agent disclosed by the invention can reduce the bioavailability of arsenic and cadmium, can increase the fertility of soil, and can complete the improvement of the fertility of soil while repairing arsenic and cadmium; the composite agent can repair arsenic and cadmium simultaneously, has simple components and wide sources, and is convenient for farmers to apply and use by themselves.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The compound agent for repairing heavy metal arsenic and cadmium in acid paddy fields is characterized by comprising the following components in parts by weight: passivation conditioners, gelling agents and fertility enhancers; wherein,
the passivation conditioner comprises agricultural ferrous sulfate and bentonite, the gelling agent is magnesium oxide, and the fertility enhancer comprises a silicon fertilizer, an organic fertilizer and a compound fertilizer.
2. The compound medicament for remedying the heavy metal arsenic and cadmium in the acid paddy field as claimed in claim 1, wherein the addition amount of the agricultural ferrous sulfate is 1-2 per mill of the mass of the soil to be remediated, and the addition amount of the bentonite is 1-3 percent of the mass of the soil to be remediated.
3. The compound medicament for remedying the heavy metal arsenic and cadmium in the acid paddy field as claimed in claim 1, wherein the addition amount of the magnesium oxide is 1 to 3 per mill of the mass of the soil to be remediated.
4. The compound reagent for remediating the heavy metal arsenic and cadmium in the acidic paddy field as claimed in claim 1, wherein the addition amount of the silicon fertilizer is 1-2 per mill of the mass of the soil to be remediated; the adding amount of the organic fertilizer is 0.75-1% of the mass of the soil to be repaired, and the adding amount of the compound fertilizer is 0.4-0.8 per mill of the mass of the soil to be repaired.
5. The compound agent for remedying the heavy metal arsenic and cadmium in the acidic paddy field as claimed in any one of claims 1 to 4, wherein the pH value of the compound agent for remedying the soil to be remediated is between 4 and 6.
6. A restoration method for restoring heavy metal arsenic and cadmium in an acid paddy field is characterized by comprising the following steps:
uniformly mixing a passivation conditioner, a gelling agent and a fertilizer enhancer according to a preset proportion to obtain the composite agent for repairing the heavy metal arsenic and cadmium in the acidic paddy field as claimed in any one of claims 1 to 5;
putting the composite agent into a rice farm field;
carrying out rotary tillage on the soil layer of 0-20cm by using a rotary cultivator to ensure that the compound agent is fully mixed with the soil of the paddy field for reaction;
after reacting for 3-5 days, planting and reasonably managing the rice field according to local rice planting habits.
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