Abstract
Due to the special sensitivity of typical ecologically fragile areas, a series of human life, mining, and other activities have a greater impact on the environment. In this study, three coal mines in Ordos City on the Loess Plateau were selected as the study area, and the pollution levels of heavy metals in the area were studied by measuring As, Hg, Cr, Cd, Cu, Ni, and Pb in the soil of 131 sampling points. Combined with the concept of “co-occurrence network” in biology, the level of heavy metals in soil was studied using geostatistics and remote sensing databases. The results showed that the concentrations of Hg, Cr, Ni, Cu, and Pb in more than half of the sampling points were higher than the local environmental background value, but did not exceed the risk control value specified by China, indicating that human factors have a greater influence, while Cd and As elements are mainly affected Soil parent material and human factors influence. Heavy metal elements have nothing to do with clay and silt but have an obvious correlation with gravel. Cd, Pb, As and Ni, Cd, Cr are all positively correlated, and different heavy metals are in space The distribution also reflects the autocorrelation, mainly concentrated in the northeast of the TS mining area and the middle of the PS mining area.
Highlights
Soil heavy metal pollution is one of the main environmental problems related to potential ecological risks and public health impacts [1]
Heavy metals enter the human body through a variety of ways, increasing the risk of cardiovascular, neurological, and kidney diseases [3,4,5,6]
The main goals of this research are: (i) to determine the degree of pollution of heavy metals in the soil; (ii) to visualize the internal relationship between heavy metals and soil texture based on the concept of “co-occurrence network” in biology; (iii) based on geostatistics and PMF The model determines the spatial variation characteristics of soil heavy metal concentrations and explains the source of pollution
Summary
Soil heavy metal pollution is one of the main environmental problems related to potential ecological risks and public health impacts [1]. Due to the toxicity and refractory of heavy metals, over time, the accumulation of heavy metals in the soil will lead to soil nutrients. Loss, leading to degradation of soil biology and function [2]. Heavy metals enter the human body through a variety of ways (for example, ingestion of soil, inhalation of dust, skin contact with soil, and consumption of food crops grown in contaminated soil), increasing the risk of cardiovascular, neurological, and kidney diseases [3,4,5,6]. Relevant studies have shown that the accumulation of heavy metals is related to location and has obvious spatial inhomogeneity [7]. In areas of severe human disturbance, especially mining and smelting areas, the concentration of heavy
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