Trace element contamination in urban topsoil in China during 2000-2009 and 2010-2019: Pollution assessment and spatiotemporal analysis
Trace element contamination in urban topsoil in China during 2000-2009 and 2010-2019: Pollution assessment and spatiotemporal analysis
复制标题
2000-2009年和2010-2019年中国城市表土微量元素污染：污染评估与时空分析
DOI：
10.1016/j.scitotenv.2020.143647
复制
发表时间：
2021
影响因子：
9.8
通讯作者：
Liu Xinrong
中科院分区：
文献类型：
--
作者：
Yang Zhongping;Li Xuyong;Wang Yao;Chang Jiazhuo;Liu Xinrong
近年来，中国政府发起了一场防治土壤污染的关键战役，以建立有效的污染预防和控制框架。本研究旨在调查全国城市表层土壤中潜在有毒微量元素的长期污染状况，并进一步调查过去十年污染控制的有效性。分别采集2000-2009年和2010-2019年中国城市表层土壤中As、Cd、Cr、Cu、Hg、Ni、Pb和Zn 8种元素的含量进行对比分析。个别和综合污染水平的元素进行了评估，在城市，省，区域和国家尺度，并进一步空间映射使用GIS。结合主成分分析，确定了影响全国土壤中这些元素的主要因素。结果表明，在城市表层土壤中潜在的有毒微量元素的积累，其中NNIPI超过3在这两个时期的严峻形势。As、Cd、Hg等元素与工业活动和燃煤密切相关。汞，特别是镉污染（NPI > 3）被发现在大多数城市的研究是严重的。As、Cu、Pb和Zn的污染程度为轻度到中度（1.0 < NPI <= 3.0），Cu、Pb和Zn与机动车使用有显著相关性。土壤Cr、Ni主要受成岩母质控制，污染程度较轻（1.0 < NPI <= 2.0）。各区域的污染模式显示出不同的特点，同一区域和同一国家的污染模式几乎没有随时间变化。汞污染在北方地区（西北，MYeR，NE和NC）占主导地位，而镉污染更严重的南部（EC，MYaR，SC和SW）。值得注意的是，中国的综合污染水平在这两个时期保持稳定，过去十年出现了改善的势头。(C)2020爱思唯尔B. V.保留所有权利。
The Chinese government has launched a critical battle against soil pollution in recent years to establish an effective pollution prevention and control framework. This study sought to investigate the long-term pollution status of potentially toxic trace elements in urban topsoil nationwide, and to further investigate the effectiveness of pollution control over the past decade. The concentrations of 8 elements (As, Cd, Cr, Cu, Hg, Ni, Pb, and Zn) in urban topsoil in China between 2000-2009 and 2010-2019 were separately collected for comparative analysis. Individual and comprehensive pollution levels of the elements were evaluated at the city, provincial, regional, and national scales, and further spatially mapped using GIS. Combined with PCA, the main factors influencing these elements in soil nationwide were identified. The results revealed a severe situation in terms of potentially toxic trace element accumulation in urban topsoil, where the NNIPIs surpassed 3 in both periods. The elements As, Cd, and Hg were closely associated with industrial activity and coal burning. Hg and, in particular, Cd pollution (NPI > 3) were found to be severe in most of the cities studied. For the elements As, Cu, Pb, and Zn, pollution ranged from slight to moderate (1.0 < NPI <= 3.0), and Cu, Pb, and Zn were related to a significant degree with vehicle use. Soil Cr and Ni were mainly controlled by parent materials of lithogenic origin, and slight pollution was identified (1.0 < NPI <= 2.0). Pollution patterns showed different characteristics across the regions, and those of the same region and the nation hardly changed over time. Mercury pollution was dominant in the northern regions (NW, MYeR, NE, and NC), while Cd pollution was more severe for the south (EC, MYaR, SC, and SW). Notably, the country's comprehensive pollution level was stable across the two periods, with momentum towards improvement observed over the past decade. (C) 2020 Elsevier B.V. All rights reserved.