成都市河道表层沉积物(淤泥)铅污染特征

Lead Pollution Character of Urban River Sediments in Chengdu City

文章分析了成都市河道(沙河、府河、南河)表层沉积物淤泥铅含量特及铅同位素丰度比的测定数据,结果表明铅含量变化范围是21.1~279 mg/kg,平均值为65.3 mg/kg,中值55.2 mg/kg,统计标准差65.03,变异系数为0.996,说明河道表层沉积物含量变化大。端元物质的铅同位素组成特征是燃煤的放射成因铅高于燃油,可以示踪和鉴别成都市环境铅的污染来源。三河淤泥铅同位素组成均大多落在崔家店热电厂降尘和华能热电厂燃煤飞灰的范围,沙河、府河有少数几个样品点落在燃煤铅(崔家店热电厂燃煤降尘)和柴油铅之间,其铅的来源可能是两者的混合。

The data of urban river sediments(including Shahe river,Fuhe river and Nanhe river) were studied.The average value of lead content was 65.3?mg/kg in the range from 121.1～279?mg/kg,the medium was 55.2?(mg/kg),SD was 65.03 and C.V.was 0.996.Because the radioactivity of coal fly ash was much higher than the gasoline and diesel oil,the sources of the aerosol lead could be distinguished.The isotopic composition of lead was mainly within the range of coal fly ash,which revealed that the coal Pb was the dominating pollutant sources.The Pb contents of few samples locating in Shahe and Fuhe river were between Pb contents of the coal fly ash and diesel oil,which revealed pollution resources were mixed by the coal and diesel oil pollution.