[云贵高原西部偏远山区表土重金属污染]。

Q2 Environmental Science
Meng-Xia Yan, En-Feng Liu, Xiao-Yu Wang, Wen-Ke Chen, Guo-Zhan Li, Ming Ji, En-Lou Zhang
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引用次数: 0

摘要

人为排放的重金属对偏远地区的生态环境造成了负面影响。本研究在云贵高原西部海拔 2 563-4 037 米的 13 个偏远山区采集了 69 个表层土样品,测定了样品中 10 种重金属的含量。参考富集因子(EF)、正矩阵因式分解(PMF)和铅同位素,探讨了表土中重金属的富集特征和污染源。结果表明,表土中铝、铁、铜、钒、锌的平均含量低于云南省土壤背景值;镍、铅的平均含量与背景值相近;镉、铬、汞的平均含量是背景值的1.8-3.6倍。根据 EF 分级标准,铅、铬和镍的平均 EF 值分别为 3.8、3.4 和 2.3,富集程度中等;镉和汞的平均 EF 值分别为 15.2 和 10.0,富集程度显著;其他金属的平均 EF 值介于 1.1 至 1.9 之间,富集程度不弱。综合表土和基岩中重金属浓度和比率的比较以及 EF 和 PMF 的结果,表土中的铝、铁、钒、铬、铜、镍和锌主要来自碎屑源,金属的空间浓度变化主要受母质的调节。镉、汞和铅明显受到人为排放的污染,主要来源是有色金属冶炼和燃煤。镉、汞、铅污染较重的地区主要分布在甲子雪山、碧塔海流域、罗积山和老君山地区。人为排放占表土重金属累积量的 23.8%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
[Pollution of Heavy Metals in Topsoil of Remote Mountainous Areas in Western Yunnan-Guizhou Plateau].

Heavy metals from anthropogenic emissions have had a negative impact on the ecological environment in remote regions. A total of 69 topsoil samples were collected from 13 remote mountainous areas in the western Yunnan-Guizhou Plateau at altitudes of 2 563-4 037 m, and the concentrations of ten heavy metals in the samples were determined. Enrichment characteristics and pollution sources of heavy metals in topsoil were discussed by referencing the enrichment factor (EF), positive matrix factorization (PMF), and Pb isotopes. The results showed that the average concentrations of Al, Fe, Cu, V, and Zn in the topsoil were lower than the soil background values in Yunnan Province; the average concentrations of Ni and Pb were similar to the background values; and the average concentrations of Cd, Cr, and Hg were 1.8-3.6 times higher than the background values. The average EF values of Pb, Cr, and Ni were 3.8, 3.4, and 2.3, respectively, showing moderate enrichment according to the EF classification criteria; the average EF values of Cd and Hg were 15.2 and 10.0, reflecting significant enrichment; and the average EF values of the other metals ranged from 1.1 to 1.9, displaying none-weak enrichment. Combining the comparisons of heavy metal concentrations and ratios in topsoil and bedrock and the EF and PMF results, Al, Fe, V, Cr, Cu, Ni, and Zn in topsoil were considered primarily from detrital sources, and the spatial concentration variations of the metals should have been mainly regulated by the parent material. Cadmium, Hg, and Pb were obviously polluted by anthropogenic emissions, and the main sources were non-ferrous metal smelting and coal combustion. The areas with relatively high Cd, Hg, and Pb pollution were mainly distributed in the Jiaozi snow mountain, Bitahai watershed, Luoji Mountain, and Laojun Mountain areas. Anthropogenic emissions contributed 23.8% of the accumulation of heavy metals in the topsoil.

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来源期刊
Huanjing Kexue/Environmental Science
Huanjing Kexue/Environmental Science Environmental Science-Environmental Science (all)
CiteScore
4.40
自引率
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发文量
15329
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