Human health risk assessment method for heavy metal contaminated soil

A technology for human health and polluted soil, applied in soil material testing, material inspection products, etc.

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

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the deficiencies in the existing human health risk assessment methods for heavy metal-contaminated soils, the

Method used

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  • Human health risk assessment method for heavy metal contaminated soil
  • Human health risk assessment method for heavy metal contaminated soil
  • Human health risk assessment method for heavy metal contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0097] Embodiment 1 Zinc (Zn) contaminated soil human health risk assessment method

[0098] 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 wa...

Embodiment 2

[0134] Embodiment 2 Copper (Cu) contaminated soil human health risk assessment method

[0135] 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 way 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

[0141] Embodiment 3 cadmium (Cd) contaminated soil human health risk assessment method

[0142] 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 ...

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Abstract

The invention discloses a human health risk assessment method for heavy metal contaminated soil. The method comprises the following steps: firstly, respectively constructing functional relationships C1 (pH) and C2 (pH) between the leaching concentration and acid dissolution state concentration of heavy metals in a soil sample and the pH value of an extracting agent; then, calculating the human health risk concentration Crisk in the soil sample, enabling the Crisk to meet a formula: Crisk = 0.5*C1 (pH)+0.5*C2 (pH); then, calculating the total carcinogenic risk and/or hazard index of heavy metalin the soil sample by referring to related parameters provided in "Technical Guidelines for Soil Pollution Risk Assessment of Construction Land (HJ 25.3-2019)" and a calculation model; and finally, evaluating whether the heavy metal contaminated soil has human health risks or not by referring to (HJ 25.3-2019) evaluation standards. The method is stricter, and dynamic evaluation of the human health risk of reutilization of the heavy metal contaminated soil after remediation under different pH environmental conditions is achieved.

Description

technical field [0001] The invention belongs to the fields of soil pollution risk management and control and human health risk assessment, and in particular relates to a human health risk assessment method for heavy metal polluted soil. Background technique [0002] With the acceleration of my country's urbanization process and the transformation of industrial structure, a large number of people have flooded into cities, resulting in more scarce urban land resources and rising land costs. The adjustment of industrial structure directly leads to the closure or relocation of traditional enterprises with backward production capacity and old factories. 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 dy...

Claims

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Application Information

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IPC IPC(8): G01N33/24
CPCG01N33/24
Inventor 谢邵文刘承帅孟方圆
Owner GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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