沈阳地区河流灌渠沿岸农田表层土壤中重金属的污染现状评价

Evaluations of Heavy Metal Pollution Status in Surface Soils Adjacent to the Rivers and Irrigation Channel in Shenyang,China

用地积累指数法和单因子内梅罗综合指数法研究了沈阳地区蒲河、浑河、细河以及沈抚灌渠周边农田表层土壤中7种重金属的污染状况。结果表明,表层土壤中As、Hg、Cd、Pb和Cr的最大值出现在细河周边,Zn和Cu的最大值出现在沈抚灌渠周边,Hg、Cd、Pb、Zn、Cu、Cr6种重金属的平均含量在各个区域中差别明显。Cd与Hg之间的相关系数高,表明Cd、Hg来源相同;Pb、Zn、As、Cu相关性好,判定可能来自同一来源。地积累指数和单因子内梅罗综合指数计算结果表明,Cd、Hg、Zn污染在这些河流地区较普遍,Pb、Cu、Cr和As在部分地区受到污染,部分细河沿岸农田土壤受到严重污染。

The pollution situation of seven types of heavy metals in surface soils from the farmland adjacent to the Pu River,Hun River,Xi River and the Shenyang-Fushun Irrigation Channel were studied using the geo-accumulation index（I geo） and the single factor Nemerow index（NI） methods.The maxima of As,Hg,Cd,Pb and Cr in surface soils occurred in the Xi River area and the maxima of Zn and Cu appeared in the Shenyang-Fushun irrigation channel.The average concentrations of Hg,Cd,Pb,Zn,Cu and Cr were significantly different in each studied area.Cd and Hg were highly correlated,suggesting a common source.Pb,Zn,As and Cu were highly correlated,suggesting another common source.Igeo and NI calculation showed that Cd,Hg,Zn pollution in studied areas was a common phenomenon and pollution of Pb,Cu,Cr and As also occurred in some river areas in Shenyang.The farmland soils nearby the Xi River were seriously polluted.