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Composite modified diatomite heavy metal passivator and application thereof

A heavy metal passivator and compound modification technology, applied in applications, fertilizer mixtures, soil conditioning materials, etc., can solve problems such as low remediation efficiency and secondary pollution, and achieve good health, reduce heavy metal content, and have a wide range of sources. Effect

Active Publication Date: 2019-05-21
INST OF SOIL & FERTILIZER ANHUI ACAD OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is how to solve the problems of low repair efficiency and secondary pollution in the prior art through the preparation of a new type of heavy metal passivator and the application method of the passivator, so as to reduce the accumulation of heavy metals in agricultural products and improve the production efficiency. The goal of agricultural product quality is to provide guarantee for the safe production of agricultural products in our country

Method used

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  • Composite modified diatomite heavy metal passivator and application thereof
  • Composite modified diatomite heavy metal passivator and application thereof
  • Composite modified diatomite heavy metal passivator and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Select the target planting site (that is, the heavy metal contaminated soil to be repaired). The heavy metal content of the farmland soil was measured, and the results are shown in Table 1. According to the National Standard of the People's Republic of China "Soil Environmental Quality Standard" (GB15618-1995), the National Standard of the People's Republic of China "Safety Thresholds for Cadmium, Lead, Chromium, Mercury and Arsenic in Rice Production Soil" (GB / T36869-2018) and "National "Technical Regulations on the Safety Assessment of Soil Heavy Metals in Agricultural Products Producing Areas" (2015), the risk level of heavy metals in the selected rice fields is low risk (1<Pi≤2, 1<Pimax≤2).

[0056] Table 1 Soil heavy metal content in sampling plot I

[0057] Soil heavy metal content

Cd(mg / kg)

Sample plot I

0.24

GB15618-1995 first level standard

0.20

GB15618-1995 secondary standard

0.30

GB15618-1995 Level 3 Standard

1.00

[0058] 1. The in-situ passivation met...

Embodiment 2

[0114] Select the target planting site (that is, the heavy metal contaminated soil to be repaired). The soil heavy metal content was determined, and the results are shown in Table 9. According to the National Standards of the People’s Republic of China "Soil Environmental Quality Standards" (GB15618-1995) and "National Technical Regulations for the Assessment of Soil Heavy Metal Safety in Agricultural Products Producing Areas" (2015), the heavy metal risk level of the soil in the selected crop planting plots is moderate risk (2 <Pi≤3, 2<Pimax≤3).

[0115] Table 9 Soil heavy metal content of sampling plot II

[0116]

[0117] 1. The in-situ passivation method of the present invention

[0118] (1) A method for preparing a modified diatomite heavy metal passivator, including the following steps:

[0119] CaCO 3 Preparation of modified diatomite:

[0120] ①According to the solid-liquid ratio of 1g / 8mL, mix the diatomaceous earth and the hydrochloric acid solution with a concentration of ...

Embodiment 3

[0165] Select the target planting site (that is, the heavy metal contaminated soil to be repaired). The soil heavy metal content was determined, and the results are shown in Table 15. According to the National Standard of the People's Republic of China "Soil Environmental Quality Standard" (GB15618-1995), the National Standard of the People's Republic of China "Cd, Lead, Chromium, Mercury, Arsenic Safety Thresholds for Dryland Soil Growing Root Vegetables" (GB / T36783-2018) , "National Technical Regulations for the Evaluation of Soil Heavy Metal Safety in Agricultural Product Producing Areas" (2015), the heavy metal risk level of the soil in the selected crop planting plots is medium risk (2<Pi≤3, 2<Pimax≤3).

[0166] Table 15 Soil heavy metal content in sampling plot III

[0167]

[0168] 1. The in-situ passivation method of the present invention

[0169] (1) A method for preparing a modified diatomite heavy metal passivator, including the following steps:

[0170] CaCO 3 Preparatio...

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Abstract

The invention discloses a composite modified diatomite heavy metal passivator. The composite modified diatomite heavy metal passivator is prepared from, by mass, 20-115 parts of biological carbon powder of straw, 10-20 parts of CaCO3-modified diatomite, 5-10 parts of Mg(OH)2-modified diatomite and 2-5 parts of Fe3O4-modified diatomite. The invention also discloses application of the composite modified diatomite heavy metal passivator. The passivator has the advantages that the repairing efficiency is high, secondary pollution is reduced, the purposes of reducing the accumulation amount of heavy metal in agricultural products and improving the quality of the agricultural products are achieved, and a guarantee is offered to safe production of the agricultural products in China.

Description

Technical field [0001] The invention relates to the technical field of heavy metal passivators, in particular to a composite modified diatomite heavy metal passivator and its application. Background technique [0002] Heavy metals are non-essential elements for the growth of animals and plants. When heavy metals enter the farmland soil, they will be absorbed and accumulated by plants, and enter the human body through the food chain, posing a threat to human health. [0003] In 2014, the former Ministry of Environmental Protection and the Ministry of Land and Resources jointly issued the "National Soil Pollution Status Survey Bulletin", which showed that the soil point of my country's cultivated land exceeded the standard rate of 19.4%, and the main pollutants were cadmium (Cd), nickel (Ni), and copper. (Cu), arsenic (As), mercury (Hg), lead (Pb), etc. The Ministry of Agriculture's survey of 1.4 million hectares of sewage irrigated areas in my country found that soil heavy metals ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/06C09K17/08A01B79/02C09K101/00
Inventor 李虹颖方凌叶新新俞飞飞王艳贾利严从生江海坤董言香
Owner INST OF SOIL & FERTILIZER ANHUI ACAD OF AGRI SCI
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