GIS-based mining area soil heavy metal potential risk evaluation method

Abstract

The invention belongs to the technical field of environment, and discloses a GIS-based mining area soil heavy metal potential risk evaluation method. The method comprises the following steps: determining the quantity and types of soil heavy metals in a mining area; obtaining soil heavy metal contents of a plurality of sampling points of the mining area research area; obtaining a comprehensive potential ecological hazard index according to the quantity, variety and content of the soil heavy metals; obtaining an evaluation threshold according to the quantity and types of the soil heavy metals; and obtaining a potential risk evaluation result according to the comprehensive potential ecological hazard index and the evaluation threshold. According to the method, the evaluation threshold of potential ecological risk evaluation is adjusted according to the number and types of studied heavy metals, and the result shows that the adjusted evaluation result better conforms to the actual situation.

Description

technical field [0001] The invention belongs to the field of environmental technology, in particular to a method for evaluating potential risks of heavy metals in mining soil based on GIS. Background technique [0002] Soil is the basis for the survival of crops, and the content or residues of various pollutants in it directly affect the quality and food safety of crops. After the heavy metals accumulated in the soil are enriched and absorbed by crops, they finally reach the human body through the food chain, which is harmful to the human body. potential health risks. The negative impact of heavy metals on the soil environment caused by the production activities of industrial and mining enterprises, such as mineral collection, processing, and transportation, cannot be ignored. Heavy metals from mining areas have a high content in the soil, a wide range of influence, a long period, and are close to farmland and residential areas, which have a serious impact on the ecological...

AI Technical Summary

Problems solved by technology

However, most scholars did not make corresponding adjustments to the evaluation criteria when applying potential ecological risk analysis to evaluate soil heavy metal pollution, resulting in inaccurate evaluation results.

The human health exposure risk model proposed by the US EPA has been widely used in the health risk assessment of heavy metals, but some researchers believe that the model parameters do not conform to the actual human exposure characteristics in my country

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