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Compound Modified Diatomite Heavy Metal Passivator and Its Application

A heavy metal passivator and compound modification technology, applied in applications, fertilizer mixtures, soil conditioning materials, etc., can solve the problems of secondary pollution and low repair efficiency, achieve no secondary pollution, protect health, and reduce absorption and the effect of accumulation

Active Publication Date: 2021-06-01
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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  • Compound Modified Diatomite Heavy Metal Passivator and Its Application
  • Compound Modified Diatomite Heavy Metal Passivator and Its Application
  • Compound Modified Diatomite Heavy Metal Passivator and Its Application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Select the target planting site (that is, the heavy metal-contaminated soil to be remediated). 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 of Cadmium, Lead, Chromium, Mercury and Arsenic in Rice Production Soil" (GB / T36869-2018) and "National According to Technical Regulations on Safety Assessment of Heavy Metals in Soil of Agricultural Products Origin (2015), the risk level of heavy metals in the selected paddy fields is low risk (1

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

[0057] Soil heavy metal content Cd (mg / kg) Sampling plot I 0.24 GB15618-1995 level one standard 0.20 GB15618-1995 secondary standard 0.30 GB15618-1995 Level 3 standard 1.00 ...

Embodiment 2

[0114] Select the target planting site (that is, the heavy metal-contaminated soil to be remediated). Determination of soil heavy metal content, 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 on the Safety Assessment of Heavy Metals in Soils of Agricultural Products" (2015), the heavy metal risk level of the selected crop planting plot soil is moderate risk (2

[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 preparation method of modified diatomite heavy metal passivator, comprising the steps of:

[0119] CaCO 3 Preparation of modified diatomite:

[0120] ①According to the proportion of solid-liquid ratio of 1g / 8mL, mix diatomite raw soil and hydrochloric acid aqueous solution with a concentration of 1m...

Embodiment 3

[0165] Select the target planting site (that is, the heavy metal-contaminated soil to be remediated). Determination of soil heavy metal content, 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 "safety thresholds of cadmium, lead, chromium, mercury, and arsenic in dryland soil for planting root vegetables" (GB / T36783-2018) , "National Agricultural Product Origin Soil Heavy Metal Safety Assessment Technical Regulations" (2015), the heavy metal risk level of the selected crop planting plot soil is moderate risk (2

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

[0167]

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

[0169] (1) a preparation method of modified diatomite heavy metal passivator, comprising the steps of:

[0170] CaCO 3 Preparation of modifi...

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Abstract

The invention discloses a composite modified diatomite heavy metal passivator, which is prepared from the following raw materials in parts by mass: 20-115 parts of straw biochar powder, CaCO 3 Modified diatomaceous earth 10-20 parts, Mg(OH) 2 Modified diatomaceous earth 5‑10 parts, Fe 3 o 4 2‑5 parts of modified diatomaceous earth. The invention also discloses the application of a composite modified diatomite heavy metal passivator. The invention has the advantages of high restoration efficiency and reduction of secondary pollution, realizes the goal of reducing the accumulation of heavy metals in agricultural products, improves the quality of agricultural products, and provides guarantee for the safe production of agricultural products in my country.

Description

technical field [0001] The invention relates to the technical field of heavy metal passivators, in particular to composite modified diatomite heavy metal passivators and applications thereof. Background technique [0002] Heavy metals are non-essential elements for the growth of animals and plants. When heavy metals enter the soil of farmland, 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 "National Soil Pollution Survey Bulletin" jointly issued by the former Ministry of Environmental Protection and the Ministry of Land and Resources showed that 19.4% of my country's cultivated land soil points exceeded the standard, and the main pollutants were cadmium (Cd), nickel (Ni), 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 64.8% of the areas where heavy me...

Claims

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Application Information

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Patent Type & Authority Patents(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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