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Passivating agent for mercury-polluted soil remediation

A passivating agent, mercury pollution technology, applied in the field of agricultural soil remediation, can solve problems such as low effectiveness and poor plant absorption capacity

Inactive Publication Date: 2014-06-04
INST OF GEOCHEM CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In general, the dissolved state, exchangeable state and special adsorption state have high effectiveness and are easily absorbed by plants, while the iron-manganese oxidation state and organic binding state are potentially effective, and can be converted into an effective state when the soil environmental conditions change. Absorbed by plants, while the residue state is the least effective, and plants have relatively poor absorption capacity

Method used

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  • Passivating agent for mercury-polluted soil remediation
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  • Passivating agent for mercury-polluted soil remediation

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Bentonite is represented by PRT, and diammonium hydrogen phosphate is represented by P.

[0022] A mercury-contaminated farmland was divided into 24 plots of 1m×2m, with an interval of 30cm between plots. Bentonite and diammonium hydrogen phosphate were added in proportion to the soil mass, and a total of 8 treatments were established: ① control (CK) ② PRT3%+P1% ③ PRT3%+P0.5% ④ PRT3%+P0.25% ⑤ PRT3% ⑥ P1% ⑦ P0.5 %⑧P0.25%. The soil remediation depth is 16 cm. Each treatment was repeated 3 times. The passivating agent was spread manually and tilled twice with a rotary tiller to mix it evenly with the soil. One month after the passivation agent was added to the soil, Chinese cabbage (Brassica campestris L) and radish (Raphanus sativus) were planted. During crop growth, weeding, fertilization, pesticide spraying and irrigation are carried out in accordance with local production management methods. The crops are harvested after 40 days of growth. Each plot randomly coll...

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Abstract

The invention discloses a passivating agent for mercury-polluted soil remediation, which comprises bentonite and diammonium hydrogen phosphate, wherein the using amount of the bentonite is 1-6% of the weight of the soil, and the using amount of the diammonium hydrogen phosphate is 0.1-3% of the weight of the soil. The bentonite is sodium-based bentonite, and has a particle size of 200 meshes. The passivating agent for mercury-polluted soil remediation of the invention can significantly reduces the total mercury content of edible parts of crops, while other treatment methods have no obvious reduction trend. By analyzing the morphologic change characteristics of soil mercury before and after remediation, it is found that the passivating agent for mercury-polluted soil remediation of the invention significantly reduces the contents of effective-state mercury (dissolved-state, exchangeable-state, and special adsorption-state mercury) and ferro-manganese oxidation-state mercury in soil, and the contents of organically combined-state mercury and residue-state mercury are not changed significantly.

Description

technical field [0001] The invention relates to the technical field of agricultural soil restoration, in particular to a passivator for repairing mercury-polluted soil. Background technique [0002] Mercury is a non-essential toxic heavy metal that is ubiquitous in the environment. According to reports, my country's annual discharge of mercury into the environment due to industrial and agricultural production reaches 1.9×10 5 tons, causing a large area of ​​cultivated land to suffer from mercury pollution (Wang Xin and Zhou Qixing, 2002). After mercury enters the soil, it directly threatens the quality and safety of crops. For example, the methylmercury content of rice planted in my country's Wanshan mercury mining area is as high as 170ug.kg -1 , far higher than the maximum total mercury concentration in grain of 20ug.kg stipulated in my country's food hygiene limit standard -1 (GB2762-2005). The total mercury content in the edible part of the vegetables grown in the m...

Claims

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Application Information

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IPC IPC(8): C09K17/08C09K101/00
Inventor 王建旭谢园艳冯新斌
Owner INST OF GEOCHEM CHINESE ACADEMY OF SCI
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