【作者】 林承奇； 胡恭任； 于瑞莲；

【Author】 Chengqi Lin;Gongren Hu;Ruiliany Yu;College of Chemical Engineering,Huaqiao University;

【机构】 华侨大学化工学院；

【摘要】 本文分析测定了九龙江流域53个表层沉积物中总量和酸可溶相的Pb含量及其铅同位素组成以示踪沉积物中的铅来源。分析结果表明:沉积物中Pb平均含量为110.86 mg/kg(38.50~839.60 mg/kg),约为福建省土壤元素背景值的3.18倍;酸可溶相的Pb占总量Pb的比例平均为62.9%;地质累积指数法和潜在生态风险指数法评价结果表明,九龙江表层沉积物中Pb为轻度污染,并具有低的潜在生态危害;铅同位素分析结果表明,九龙江沉积物中Pb主要来源于自然源(土壤母质)和人为源(燃煤和铅锌矿),其相对贡献率分别为34.41%、34.00%和31.59%;0.5 mol/L HNO3酸可溶相Pb同位素分析结果表明,酸可溶相Pb同位素在示踪人为源方面比总量Pb同位素更准确。更多还原

【Abstract】 Pb concentrations and Pb isotopic compositions(both total and acid-extractable) in the fifty-three surface sediment samples from Jiulong River,Southeast China,were determined to trace the sources of Pb.The average concentrations of Pb were 110.86 mg/kg,approximately 3.18 times as high as the local soil background values.The average 62.9% of total Pb were extracted by 0.5 mol/L HNO3 for the investigated surface sediment samples.Pb presented slightly contaminated and had low ecological risk for most of surface sediment samples in Jiulong River.Pb accumulated in the surface sediments of Jiulong River was a mixture of Pb mainly came from natural sources and anthropogenic sources(coal combustion and Fujian Pb–Zn deposit),with the contribution rates of 34.41%,34.00%,and 31.59%,respectively.Pb isotopic compositions in 0.5 mol/L HNO3-extraction suggested that dilute HNO3-extraction was more sensitive in identifying anthropogenic Pb sources than total digestion.更多还原