Abstract
ABSTRACT Introduction The development of coal power base (CPB) poses a severe challenge to the soil. We conducted a soil survey in Xilinhot CPB, to evaluate and analyze the pollution characteristics, potential ecological risk, and sources of six heavy metals (As, Pb, Cu, Zn, Mn, and Cd) in soil by using Geo-accumulation index, revised Nemerow integrated pollution index (RNIPI), and potential ecological risk index (RI).Outcomes/other: The results showed that the pollution of Cd and As were dramatic. The mean of Cd and As were 1.11 mg·kg-1 and 25.13 mg·kg-1, which were 42.55 times and 4.41 times higher than its local background value. The Geo-accumulation indices showed the contamination degree of Cd was strong and As was moderate, and the status of Cu, Pb, Zn, and Mn were uncontaminated. Xilinhot was strongly contaminated based on its RNIPI and RI values.Discussion: The accumulations of As, Pb, and Cd were mainly associated with anthropogenic sources, including coal mining and combustion, and industrial exhaust emissions. Cu, Mn, and Zn were primarily originated from the parent material (natural sources).Conclusion: This study provides scientific basis and effective countermeasures for the prevention and control of soil pollution in surrounding areas of CPB.
Highlights
The development of coal power base (CPB) poses a severe challenge to the soil
A large amount of wastewater, gangues, and other waste residues dis charged in the production processes of coal mining, as well as the waste emissions and dust discharged in the processes of coal-fired power generation can even tually lead to the accumulation of heavy metals in the soil (Bo et al 2019; Shao et al 2019)
Past studies have revealed that heavy metals recycled through the eco logical system may be transferred into human bodies and accumulated in organisms by ways of ingestion, inhalation, dermal contact, or through the food chain (Wu et al 2014; Fan 2015)
Summary
The development of coal power base (CPB) poses a severe challenge to the soil. A series of ecological problems have been brought out during the development of CPBs. A large amount of wastewater, gangues, and other waste residues dis charged in the production processes of coal mining, as well as the waste emissions and dust discharged in the processes of coal-fired power generation can even tually lead to the accumulation of heavy metals in the soil (Bo et al 2019; Shao et al 2019). The continuous accumula tion of heavy metals in soil caused by industrial activ ities in last two decades has posed a serious threat to human health in China (Wang 2014; Huang et al 2018)
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