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OALib Journal期刊
ISSN: 2333-9721
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沁河沉积物重金属垂直分布特征与风险评价
DOI: 10.3724/SP.J.1145.2013.00305, PP. 305-312
Keywords: 沁河,沉积物,重金属,垂直分布,风险评价
Abstract:
结合沁河环境参数对其所流经的5个县市22个采样点的垂直分布特征进行分析，采用hakanson生态风险指数法和sqg（sedimentqualityguidelines）法对其表层沉积物生态风险进行评价，并运用富集系数法探讨其主要来源.垂直分布特征分析结果表明：沁河中下游可能曾经发生过铅（pb）、铜（cu）的污染，但逐渐得到了缓解；铬（cr）、镉（cd）在沁水县可能有一定的持续污染源.sqg分析表明：沁河沉积物中cu、zn、cr呈现出中等生态毒性，可能会对该水域的生物产生一定影响；而沁水县cd含量较高，对沁河水生生物有高毒性威胁.以山西省土壤背景值作为参比，对沁河生态风险水平由强到弱的重金属依次为cd>pb>cu>zn>cr>mn，其中沁水县生态风险最强，结果与sqg分析一致.富集系数法分析表明，河流中60%的样点呈现出重金属累积现象，cd作为西大（s11）、卧虎庄（s13）点源污染物，固定的排污口可能是其主要来源.图3表7参33
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