摘要:
分析了广州市3条河涌底泥中有机质、石油烃、Cd、Cr、Cu、Ni、Pb、Zn等主要污染物的垂直分布特征。结果表明:曾边涌、南村涌、会江涌底泥中有机质平均值分别为43.15mg/kg、10.80 mg/kg、34.81 mg/kg,石油烃含量平均值分别为:1644 mg/kg,2427 mg/kg,6763 mg/kg。有机质和石油烃垂直变化特征相似,曾边涌呈现表层底泥含量低而底层高的特征,南村涌呈现随深度增加而降低的趋势,会江涌呈现先降低后上升的趋势,3条河涌底泥中不同重金属垂直变化规律不一样;河涌底泥中污染物所呈现的垂直分布规律并不总是上层污染物浓度高而下层低的正常沉积特征。因此,在考虑通过清淤改善河流水质时,应考虑河流污染的历史,并调查沉积物中污染物垂直分布的实际情况。
关键词:
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底泥
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有机质
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石油烃
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重金属
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垂直分布
Abstract:
Vertical distribution characteristics of organic matter,petroleum hydrocarbons,Cd, Cr,Cu,Ni, Pb,Zn were studied in three rivers sediments of Guangzhou.Results showed that the contents of OM in sediments of Zengbian river,Nancun river and Huijiang river were 43.15mg/kg,10.80mg/kg,34.81mg/kg,and the contents of Phs were 1644mg/kg,2427mg/kg,6763mg/kg,respectively.Variation trends of OM and Phs were similar in vertical direction in sediments,the variety characteristics were presented by low in upper layer and high in the lower layer in Zengbian river,reduced with depth in Nancun river,reduced firstly and then risen with depth in Huijiang river;the vertical distribution of different heavy metals were different in sediments;the vertical distribution was not always showed that the contents was high in the upper layer and low in lower layer.When water quality was improved by dredging,consideration should be given to history of river pollution,and the vertical distribution of pollutants in sediments should be investigated.
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