Impact of coal power generation on the characteristics and risk of heavy metal pollution in nearby soil

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.

Keywords

• soil pollution
• heavy metal contamination
• potential ecological risk
• sustainability
• coal power base
• xilinhot