白银市不同功能区土壤重金属污染特征及其健康风险评价

生态学杂志

白银市不同功能区土壤重金属污染特征及其健康风险评价

李有文^1，4_,王晶¹,巨天珍²,王莉³,林宁¹,张胜楠¹,查向浩^1*#br#

(¹喀什大学化学与环境科学学院，新疆喀什 844000； ^2西北师范大学地理与环境科学学院，兰州 730000； ^3喀什大学生命与地理科学学院，新疆喀什 844000； ⁴自治区级生物类固废资源化工程技术研究中心，新疆喀什 844000)

出版日期:2017-05-10 发布日期:2017-05-10

Heavy metal pollution characteristics and human health risk assessment in soils from different functional areas of Baiyin, Gansu, China.

LI You-wen^1，4, WANG Jing¹, JU Tian-zhen², WANG Li³, LING Ning¹, ZHANG Sheng-nan¹, ZHA Xiang-hao^1*#br#

(¹College of Chemistry and Environmental Science, Kashgar University, Kashgar 844000, Xinjiang, China; ^2College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730000, China; ³College of Geography and Life Science, Kashgar University, Kashgar 844000, Xinjiang, China； ⁴Municipal Biological Solid Waste Recyching Engineering Technology Research Center, Kashgar 844000, Xinjiang, China).

Online:2017-05-10 Published:2017-05-10

摘要/Abstract

摘要： 调查了白银市生活区、工业区、交通区、公园绿地和山区5个功能区表层土壤中重金属As、Cd、Cr、Cu、Hg、Ni、Pb和Zn含量，并采用单因子指数法、内梅罗综合指数法和健康风险表征模型评价重金属污染水平及对人体的健康风险。结果表明，白银市各功能区土壤Cu、Cd、Hg、Pb和Zn含量显著高于甘肃土壤背景值，且工业区土壤Cu含量超过了国家土壤质量二级标准。内梅罗综合指数表明：各功能区污染程度表现为工业区>交通区>公园绿地>生活区>山区；除山区外，各功能区受Hg、Zn、Pb和Cd污染较严重，其中以Hg污染最为严重。健康风险表征模型表明：重金属对儿童的HI（总非致癌风险）和TCR（总致癌风险）均大于成人，各功能区HI和TCR均表现为工业区、生活区>交通区>公园绿地>山区；土壤As、Cr和Pb是各功能区非致癌风险最主要的3个贡献因子；土壤As和Cr是各功能区致癌风险最主要的2个贡献因子。

关键词: 保护酶, 气体交换, 文冠果, 干旱胁迫, 复水, 叶绿素荧光

Abstract: In this study, we determined the contents of 8 soil heavy metals (As, Cd, Cr, Cu, Hg, Ni, Pb and Zn) in surface soils. These soil samples were collected from five different functional areas of Baiyin City, i.e., living area, industrial district, traffic area, park green space and mountain area. We evaluated the level of heavy metal pollution and human health risk by the single pollution index, composite pollution index and health risk assessment model. The results showed that soil Cu, Cd, Hg, Pb and Zn levels of all functional areas in Baiyin City exceeded the background values of Gansu. Composite pollution index showed that the pollution levels of the different functional areas decreased in the order of industrial district > traffic area > park green space > living area > mountain area. In addition, soil Hg, Zn, Pb and Cd pollution in all functional areas except mountain area were more serious than other heavy metals, and Hg pollution was the most serious. Health risk assessment model showed that HI and TCR values of heavy metals to children were higher than those to adults. Besides, HI and TCR of different functional areas followed a pattern of industrial district, living area > traffic area > park green space > mountain area. Among the heavy metals, As, Cr and Pb were the three most important factors contributing to HI in all functional areas, and As and Cr were the two most important factors contributing to TCR in all functional areas.

Key words: drought stress, Xanthoceras sorbifolia, protective enzyme., rewatering, gas exchange, chlorophyll fluorescence

李有文1，4,王晶1,巨天珍2,王莉3,林宁1,张胜楠1,查向浩1*. 白银市不同功能区土壤重金属污染特征及其健康风险评价[J]. 生态学杂志.

LI You-wen1，4, WANG Jing1, JU Tian-zhen2, WANG Li3, LING Ning1, ZHANG Sheng-nan1, ZHA Xiang-hao1*. Heavy metal pollution characteristics and human health risk assessment in soils from different functional areas of Baiyin, Gansu, China.[J]. cje.

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