WANG Jianming1, SHI Zeming1,2, ZHENG Peijia1, WANG Xinyu1,2, ZHU Yinghai1, ZHANG Kailiang1, WANG Yu 1

（1. School of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China;
2. Sichuan Province Key Laboratory of Nuclear Techniques in Geosciences,Chengdu University of Technology, Chengdu 610059, China）

Abstract： In this paper, the lead and zinc smelting area with high elemental background and special geographical position is studied. The contents of 8 heavy metals in soil and atmospheric deposition dust were analyzed in a lead-zinc smelting area in Sichuan province. The modified BCR speciation extraction method was used to extract different binding forms of heavy metals, and the potential ecological risk index method was used to evaluate ecological risk. Correlation analysis, principal component analysis (PCA) and positive definite matrix factorization (PMF) were used to analyze the sources of heavy metals in soil. The results showed that the average contents of heavy metals in soil except Cr, Cu and Ni were higher than the reference value in the study area. The average value of heavy metals in atmospheric deposition dust is several times to tens of times higher than that in soil. The high contents of heavy metal elements in soil and atmospheric deposition dust are mainly distributed around lead-zinc smelters, which are greatly affected by the industrial activities. As, Cu, Ni and Pb in soil are mainly exist in residual state, indicating high stability in soil. Cd is mainly in acid extractable state, and its stability is poor. According to the potential ecological risk index, the study area as a whole is at a very high risk level, and Cd and Hg are the main contributing factors, reaching a very high risk level and a very high risk level, respectively. Correlation analysis, PCA and PMF source identification showed that heavy metals in soil in the study area were affected by industrial sources of lead and zinc smelting, coal combustion, natural sources and other sources.

Key words：Lead and zinc smelting area; heavy metal; soil; source identification

EARTH AND ENVIRONMENT Vol.51, No.3, Tot No.353, 2023, Page 287