| 湘江流域土壤重金属污染及其生态环境风险评价 |
| 摘要点击 4195 全文点击 2172 修订日期：2011-05-16 |
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| 中文关键词 TCLP 湘江流域 土壤 重金属 生态环境风险评价 |
| 英文关键词 toxicity characteristic leaching procedure (TCLP) Xiangjiang River Basin soil heavy metals risk assessment |
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| 中文摘要 |
| 采用美国TCLP(toxicity characteristic leaching procedure)提取重金属和内梅罗综合污染指数评价方法对湖南省湘江流域土壤重金属生态环境风险进行评价.沿湘江流域采集72个土壤样品,测定土壤中的6种主要重金属的总量、TCLP提取的有效态含量及土壤样品的污染级别.结果表明,湘江流域土壤As、Cd、Cu、Zn、Ni和Pb总含量分别在4.25~549.67、0.13~76.84、11.49~281.69、7.75~7234.81、5.50~56.65和8.60~2084.81 mg·kg-1范围之间,TCLP提取态含量分别在0.02~10.97、0.06~28.41、0.04~72.29、0.59~1152.32、0.07~10.65和0.17~1165.58 mg·kg-1范围内.TCLP提取的土壤Cd、Cu、Zn、Ni、Pb有效态含量分别与其总含量之间存在着显著的相关关系.72个土壤样品中属安全水平、警戒水平、轻污染水平、中污染水平和重污染水平所占的比率分别为60.52%、11.33%、5.65%、4.22%和18.38%,说明湘江流域土壤重金属污染存在着比较严重的生态环境风险. |
| 英文摘要 |
| The contents of heavy metals (As, Cd, Cu, Zn, Ni and Pb) in soils from Xiangjiang River Basin, Hunan Province, China, were analyzed by toxicity characteristic leaching procedure (TCLP) and Nemrow method. Results showed that the total contents of As, Cd, Cu, Zn, Ni and Pb were 4.25-549.67, 0.13-76.84, 11.49-281.69, 7.75-7234.81, 5.50-56.65 and 8.60-2084.81 mg·kg-1, respectively, and the available contents of As, Cd, Cu, Zn, Ni and Pb extracted by TCLP were 0.02-10.97, 0.06-28.41, 0.04-72.29, 0.59-1152.32, 0.07-10.65 and 0.17-1165.58 mg·kg-1. The contents of available heavy metals extracted by TCLP correlated with total contents of heavy metals. Moreover, the pollution index Nemrow method showed that 72 samples at safety level, alert level, light pollution level, medium pollution level and heavy pollution level ratios were 60.52%, 11.33%, 5.65%, 4.22% and 18.38% separately, illustrating that pollution of heavy metals in soil samples of Xiangjiang River Basin is serious. |
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