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首页> 外文期刊>Environmental Pollution >Identification of the sources and influencing factors of potentially toxic elements accumulation in the soil from a typical karst region in Guangxi, Southwest China
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Identification of the sources and influencing factors of potentially toxic elements accumulation in the soil from a typical karst region in Guangxi, Southwest China

机译：西南广西喀斯特典型喀斯特地区土壤中潜在有毒元素积累的来源和影响因素的鉴定

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摘要

Southwestern China contains the largest and most well-developed karst region in the world, and the potentially toxic elements (PTEs) content in the soils of the region is remarkably high. To explore the internal and external control factors and sources of soil PTEs enrichment in this area and to provide a basis for the treatment of PTE pollution, 113 soil samples were collected from Hengxian County, a karst region in Guangxi Province, southwestern China. The importance of eighteen influencing factors including parent material, weathering, physicochemical properties, topography and human activities were quantitatively analyzed by (partial) redundancy analysis. The sources of PTEs were identified using the Pb isotope ratio and absolute principal component score/multiple linear regression (APCS-MLR) model. The contents of all soil PTEs were higher than the corresponding background values of Guangxi soils. The contents in Cu, Zn, Cd, Hg and Pb were the highest in the soil from carbonate rock. The factor group of geological background and weathering explained 26.5% for the accumulation and distribution of soil PTEs and the influence of physicochemical properties was less than 2% but increased to 25.6% through interaction with weathering. Fe (47.1%), Al (42.1%), Mn (22%), chemical index of alteration (12.8%) and clay (11.9%) were the key factors affecting the soil PTEs, while the influence of human activities was weak. Pb isotope ratio and APCS-MLR classified 62.8-74% of soil PTEs as derived from natural sources, whereas 18.23% and 18.95% were derived from industrial activities and agricultural practice/traffic emissions, respectively. The Pb isotope ratio showed that the natural sources account for up to 90% of the Pb in the soil from carbonate rock, the highest contribution among the studied soils. The results of the study can provide background information on the soil PTEs contamination in the karst areas of China and other areas worldwide. (C) 2019 Elsevier Ltd. All rights reserved.
机译：中国西南部拥有世界上最大，最发达的喀斯特地区，该地区土壤中的潜在有毒元素（PTE）含量非常高。为探索该地区土壤PTE富集的内外部控制因素和来源，并为处理PTE污染提供依据，从西南广西喀斯特地区横县采集了113个土壤样品。通过（部分）冗余分析定量分析了十八种影响因素的重要性，包括母体材料，气候，理化性质，地形和人类活动。使用Pb同位素比和绝对主成分评分/多元线性回归（APCS-MLR）模型确定PTE的来源。土壤中所有PTE的含量均高于广西土壤的相应本底值。碳酸盐岩土壤中铜，锌，镉，汞和铅的含量最高。地质背景和风化因素组解释了土壤PTE的积累和分布为26.5％，理化性质的影响小于2％，但通过与风化的相互作用增加到25.6％。铁（47.1％），铝（42.1％），锰（22％），化学变化指数（12.8％）和黏土（11.9％）是影响土壤PTEs的关键因素，而人类活动的影响较弱。铅同位素比和APCS-MLR分类为土壤PTE的62.8-74％来自自然资源，而18.23％和18.95％分别来自工业活动和农业实践/交通排放。铅同位素比表明，碳酸盐岩中自然来源的铅占土壤铅的比例高达90％，在研究的土壤中贡献最大。研究结果可以提供有关中国喀斯特地区和世界其他地区土壤PTE污染的背景信息。 （C）2019 Elsevier Ltd.保留所有权利。

著录项

  • 来源
    《Environmental Pollution》 |2020年第1期|113505.1-113505.9|共9页
  • 作者

    Jia Zhenyi; Wang Junxiao; Zhou Xiaodan; Zhou Yujie; Li Yan; Li Baojie; Zhou Shenglu;

  • 作者单位

    Nanjing Univ Sch Geog & Ocean Sci Nanjing 210023 Jiangsu Peoples R China|Minist Land & Resources Key Lab Coastal Zone Exploitat & Protect Nanjing 210017 Jiangsu Peoples R China;

    Minist Land & Resources Key Lab Coastal Zone Exploitat & Protect Nanjing 210017 Jiangsu Peoples R China|Res Ctr Land & Resources Jiangsu Prov Nanjing 210017 Jiangsu Peoples R China;

    Nanjing Forestry Univ Coll Forestry Nanjing 210037 Jiangsu Peoples R China;

    Nanjing Univ Informat Sci & Technol Sch Environm Sci & Engn Nanjing 210044 Jiangsu Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Potentially toxic elements; RDA; Weathering; Source apportionment; Karst area;

    机译：潜在有毒元素;RDA;风化;来源分配;岩溶区;

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