Comprehensive evaluation method for ecological toxicity risk of heavy metals in sediments of rivers and lakes

A technology of ecotoxicity and comprehensive evaluation, applied in the field of environmental pollution evaluation

Active Publication Date: 2019-08-16
TSINGHUA UNIV
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Problems solved by technology

So far, there is no effective comprehensive assessment method for the ecotoxicity risk of heavy metals in river and lake sediments based on organic pollution correction at home and abroad.

Method used

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  • Comprehensive evaluation method for ecological toxicity risk of heavy metals in sediments of rivers and lakes
  • Comprehensive evaluation method for ecological toxicity risk of heavy metals in sediments of rivers and lakes
  • Comprehensive evaluation method for ecological toxicity risk of heavy metals in sediments of rivers and lakes

Examples

Experimental program
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Embodiment

[0037] Example: Based on the indicators of heavy metals and organic nutrients in sediment samples of a certain river network, a comprehensive evaluation of the ecotoxicity risk of heavy metals was carried out.

[0038] refer to figure 1 According to the flow chart, the level of heavy metal pollution at different sampling points was initially evaluated, combined with the level of organic pollution, a structural equation model was constructed, and the ecological toxicity risk of heavy metals in sediment was calculated and verified through the correction coefficient. The specific operation steps are as follows:

[0039]Select 10 sampling points in the sediment of different river sections in a river network channel to measure the basic indicators of carbon, nitrogen and phosphorus (organic matter, total organic carbon, total humic acid, total nitrogen, ammonia nitrogen, available nitrogen, alkaline hydrolyzed nitrogen, Total phosphorus, available phosphorus, organic nitrogen) and...

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Abstract

The invention relates to a comprehensive evaluation method for ecological toxicity risk of heavy metals in sediments of rivers and lakes, and mainly aims to evaluate pollution risks for river and lakesediment environments. The method comprises the following steps: determining the content of heavy metal pollutants in river and lake bottom mud, and obtaining nitrogen and phosphorus nutrition indexes of a corresponding sample; calculating the environmental pollution enrichment index and toxicology entropy of the sample and the toxicity characteristics of the heavy metals in the initial-valence bottom mud by using a formula according to the heavy metal content of the bottom mud; calculating an organic pollution load index by using the nitrogen and phosphorus nutrition data set, and constructing a structural equation model by combining the heavy metal toxicology entropy of the sample; and fitting the superposition index of organic pollution to the heavy metal toxicology, calculating the comprehensive risk index of the ecological toxicity of the heavy metal in the sample, and comparing the risk level standard to comprehensively evaluate the heavy metal toxicity risk. The method is basedon an ecological statistics method, overcomes the single evaluation limitation of heavy metals, fully considers the influence of organic pollution on the ecological toxicity of the heavy metals, andcan comprehensively evaluate the ecological toxicity risk of the river and lake sediment heavy metals.

Description

technical field [0001] The invention belongs to the technical field of environmental pollution evaluation, and in particular relates to a comprehensive evaluation method for the ecological toxicity risk of heavy metals in sediments of rivers and lakes. Background technique [0002] Surface water such as rivers and lakes not only provides essential water sources for human production and life, but also plays an important role in the construction of ecological civilization in human society. Endogenous pollution from river and lake sediments is the main factor affecting water quality. When the concentration of pollutants in the overlying water changes or the lake sediment is disturbed, the pollutants accumulated in the sediment will be released to the water again. Cause "secondary pollution". Heavy metals cannot be decomposed in water, and are easily combined with other substances. They are deposited in the bottom mud of the water body under the adsorption of suspended solids a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/06G06Q50/26
CPCG06Q10/0635G06Q50/26
Inventor 张芳魏雨泉李广贺张昊赵赢双张旭
Owner TSINGHUA UNIV
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