浙江省永康市城区土壤重金属空间分布及潜在生态风险评价

发布时间：2018-04-18 23:18

本文选题：城市土壤 + 重金属　；参考：《浙江农林大学学报》2017年06期

【摘要】：以浙江省五金工业之都——永康市主城区为研究区域,系统采集181个表层土壤样品,对样品中钛、铬、锰、钴、镍、铜、锌、砷和铅共9种重金属元素质量分数进行测定及分析,计算单因子污染指数及潜在生态风险指数,评价永康市土壤重金属的污染状况和潜在生态风险,并利用多元统计和地统计方法分析各重金属元素的空间分布特征。结果表明:(1)研究区9种土壤重金属元素中,钛、铬、锰、镍、铜、锌、钴和铅等8种元素的均值超过了金衢盆地土壤背景值,砷元素均值略低于金衢盆地背景值,各重金属元素均存在一定程度上的富集。(2)单因子污染指数显示,表层土壤中重金属污染程度依次为铬镍钴钛锰铜锌铅砷,铬元素存在轻度污染,其余各元素均为潜在污染。(3)铬、镍、铜、钴、砷元素的积累主要受到工业生产影响,锌和铅元素的积累主要受到交通运输活动的影响,钛、锰来源于工业冶金及制造活动,同时钛元素也在一定程度上来源于成土母质。(4)永康市综合潜在生态风险指数(IR)均值为49.05,处于轻度潜在生态风险,局部地区处于中度潜在生态风险,其中铜、砷和钴元素分别存在局部地区高度、中度潜在生态风险。
[Abstract]:A total of 181 surface soil samples were collected from the main urban area of Yongkang City, the capital of hardware industry of Zhejiang Province. Titanium, chromium, manganese, cobalt, nickel, copper and zinc in the samples were analyzed.The mass fraction of nine heavy metals, arsenic and lead, were determined and analyzed, the single factor pollution index and potential ecological risk index were calculated, and the pollution status and potential ecological risk of heavy metals in Yongkang soil were evaluated.The spatial distribution characteristics of heavy metal elements were analyzed by multivariate statistics and geostatistics.The results show that the mean values of 8 elements, titanium, chromium, manganese, nickel, copper, zinc, cobalt and lead, in 9 kinds of soil heavy metals in the study area exceed the soil background value of Jinqu Basin, and the mean value of arsenic element is slightly lower than the background value of Jinqu Basin.The single factor pollution index showed that the pollution degree of heavy metals in topsoil was chromium, nickel, cobalt, titanium, manganese, copper, zinc, lead, arsenic, chromium, light pollution, and the other elements were potential pollution.The accumulation of nickel, copper, cobalt and arsenic is mainly affected by industrial production, and the accumulation of zinc and lead is mainly affected by transportation activities.At the same time, the titanium element also comes from the parent material of soil to some extent. The average value of IRI in Yongkang City is 49.05, which is light potential ecological risk and moderate potential ecological risk in local area. Among them, copper, copper, copper, copper, copper, copper, copper, copper, copper, copper, copper, copper, copper, copper, copper, copper, copper,Arsenic and cobalt have local high and moderate potential ecological risk respectively.
【作者单位】：浙江农林大学林业与生物技术学院;
【基金】：浙江省重点科技创新团队项目(2011R50027)
【分类号】：X53;X826

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