三峡库区次级支流梁滩河底泥重金属污染调查及评价

文章研究的梁滩河属于长江的二级支流。通过对梁滩河白市支流的采样,用电感耦合等离子体发射光谱法分析土样,参照国家《土壤环境质量标准》(GB15618-1995)二级标准,采用单因子污染指数法和内梅罗(N.L.Nemerow)多因子综合污染指数法分析评价了梁滩河两岸淤泥中重金属元素Cu、Zn、Cr、Ni、As和Pb的含量。结果表明:梁滩河从上游到下游,Cr和As含量有增加的趋势,但基本未超过国家土壤二级标准,而和全国背景值相比,Cu略有超标,Zn含量明显超标,有的地方Zn含量甚至超标5倍之多。总体上梁滩河白市支流两岸土壤,处于重庆市白市驿镇地区重金属污染较轻,含谷镇地区重金属污染较为严重。

Investigation and Assessment of Soil Pollution by Heavy Metals in Fluvial Sediment of Liangtan River, Branch River of Three Gorges Reservoir

Soil samples were collected in Baishi tributary of Liangtan River,which is the secondary branch of Yangtze River.Pollution status of soil heavy metals including elements of Zn,Cu,Cr,Ni,As and Pb were evaluated by single factor index method and N.L.Nemerow composite index method according to Grade II in Standard of Soil Environment Quality of GB15618-1995.Results indicated that the content of Zn was higher than soil background value,and the level in some places even exceeded 5 times,while content of Cu was higher than the soil background value in somewhere.Average content of Cr and As was lower than the soil background value,but from upstream to downstream there is a rising trend.In general,the pollution of heavy metal in Baishi Town is less than that in Hangu Town,which are all along Baishi tributary.