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Heavy metal contaminated soil ecological risk assessment method

A technology for soil pollution and ecological risk, which is applied in the fields of soil pollution risk control and ecological risk assessment to achieve the effect of reducing uncertainty

Active Publication Date: 2021-01-29
GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the deficiencies in the existing heavy metal-contaminated soil ecological risk assessment methods, the purpose of the first aspect of the present invention is to provide a heavy metal-contaminated soil ecological risk assessment method

Method used

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  • Heavy metal contaminated soil ecological risk assessment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Example 1 Zinc (Zn) Contaminated Soil Ecological Risk Assessment Method

[0059] In this example, a laboratory is used to simulate heavy metal-contaminated soil. The non-polluted soil was collected from a green space in a park in Tianhe District, Guangzhou City. It was the surface soil of 30cm, the soil pH was 5.4, and the concentration of Zn in the non-polluted soil was 27.7mg / kg. ZnO powder was artificially added and fully ground to make the polluted soil The Zn content in the medium reaches 3413.7mg / kg; with the addition of Cr 2 o 3 way to form ZnCr 2 o 4 High temperature curing reaction by way of spinel, ZnO and Cr 2 o 3 It is prepared in such a way that the molar ratio is Zn:Cr=1:2. Then, coal gangue and shale were added to the mixed contaminated soil as auxiliary materials. The mass ratio of coal gangue to shale in the auxiliary material was 1:2, and the mass ratio of auxiliary material to contaminated soil was 2:1. The fully mixed and ground sample was pre...

Embodiment 2

[0067] Embodiment 2 Copper (Cu) contaminated soil ecological risk assessment method

[0068] In this example, a laboratory is used to simulate heavy metal-contaminated soil. The non-polluted soil was collected from a green space in a park in Tianhe District, Guangzhou City. It was the surface soil of 30 cm. The pH of the soil was 5.6, and the concentration of Cu in the non-polluted soil was 15.2 mg / kg. The Cu content in the medium reaches 4656.4mg / kg; with the addition of Cr 2 o 3 CuCr 2 o 4 High temperature curing reaction by means of spinel, CuO and Cr 2 o 3 The molar ratio is Cu:Cr=1:2 for preparation. Then, coal gangue and shale were added to the mixed contaminated soil as auxiliary materials. The mass ratio of coal gangue to shale in the auxiliary material was 1:2, and the mass ratio of auxiliary material to contaminated soil was 2:1. The fully mixed and ground sample was pressed into a cylindrical sample at 350MPa, and after sintering in a muffle furnace at 1000°C...

Embodiment 3

[0076] Example 3 Cadmium (Cd) Contaminated Soil Ecological Risk Assessment Method

[0077] In this example, a laboratory is used to simulate heavy metal-contaminated soil. The non-polluted soil was collected from a green space in a park in Tianhe District, Guangzhou City. It was the surface soil with a surface layer of 30 cm. The pH of the soil was 5.6, and the concentration of Cd in the non-polluted soil was 0.019 mg / kg. The Cd content in the medium reaches 8412.6mg / kg; with the addition of Cr 2 o 3 form CdCr 2 o 4 High temperature curing reaction by way of spinel, CdO and Cr 2 o 3 The molar ratio is Cd:Cr=1:2 for preparation. Then, coal gangue and shale were added to the mixed contaminated soil as auxiliary materials. The mass ratio of coal gangue to shale in the auxiliary material was 1:2, and the mass ratio of auxiliary material to contaminated soil was 2:1. The fully mixed and ground sample was pressed into a cylindrical sample at 350 MPa, and after sintering in a ...

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Abstract

The invention relates to the field of soil pollution risk management and control and ecological risk evaluation, and discloses a heavy metal contaminated soil ecological risk assessment method which comprises the following steps: firstly, constructing a function relationship C1 (pH) between the leaching concentration of heavy metals in a soil sample and the pH value of an extracting agent; then, constructing a function relationship C2 (pH) between the acid dissolution state concentration of the heavy metals in the soil sample and the pH value of the extracting agent; then, calculating the heavy metal risk concentration Crisk in the soil sample, Crisk being equal to 0.5 * C1 (pH) + 0.5 * C2 (pH); then, determining the total concentration C3 of the heavy metals in the soil sample; and finally, calculating the ecological risk R of the heavy metal contaminated soil: R = Crisk / C3 * 100%, and dividing risk levels according to the ecological risk R of the heavy metal contaminated soil. The evaluation method provided by the invention is stricter, more scientific and reasonable, and more beneficial to ecological environment protection.

Description

technical field [0001] The invention belongs to the fields of soil pollution risk control and ecological risk assessment, and in particular relates to a method for ecological risk assessment of heavy metal polluted soil. Background technique [0002] With the acceleration of my country's urbanization process and industrial structure transformation, urban land resources are becoming more scarce, and land costs continue to rise. A large number of industrial enterprises originally located in the central area are forced to move to the suburbs of the city; Older factories are facing closure or relocation scenarios. According to incomplete statistics, in recent years, more than 100,000 enterprises across the country need to be closed or relocated. In the Pearl River Delta region alone, more than 2,000 polluting enterprises have been or will be relocated in recent years. Most of these enterprises are engaged in electroplating, printing and dyeing, chemical fertilizers, pesticides a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/71
CPCG01N21/71
Inventor 谢邵文刘承帅吴非
Owner GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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