【摘要】 于2009年8月与2010年5月在长江口青草沙水库及长兴岛采集了大气颗粒物样品,测定了Zn、Pb、Cr、Cu等重金属元素的浓度,并初步估算了大气气溶胶中这些重金属在长江口的干沉降通量.结果表明:长江口PM10的平均浓度在109~197μg/m3,重金属元素浓度水平由高到低为Zn>Cr>Mn>Cu>Ti>Ni>Pb>V,其中Zn、Cr、Mn、Cu、Ni、Pb存在明显的元素富集,浓度分别达到297,241,186,181,52,32ng/m3,而相应的日平均干沉降通量分别为0.14,0.09,0.08,0.08,0.02,0.02mg/(m2.d).通过与长江口水库重金属浓度对比,大气干沉降的总Cu约占水体中总Cu浓度的25%左右,大气沉降可能是长江口水中重金属的重要来源之一.更多还原

【Abstract】 Atmospheric aerosol at the Qingcaosha Reservoir and Changxing Island,in the Yangtze Estuary,were collected,and its heavy metals measured.Concentrations of PM10were from 109to 197μg/m3.The elemental concentrations followed the order Zn > Cr > Mn > Cu > Ti > Ni > Pb > V.Zn,Cr,Mn,Cu,Ni,and Pb were significantly enriched relative to crustal contributions.The average concentrations of Zn,Cr,Mn,Cu,Ni,and Pb were estimated to be 297,241,186,181,52,and 32ng/m3.Average daily dry-depositional fluxes to the Yangtze Estuary were estimated to be 0.14,0.09,0.08,0.08,0.02,and 0.02mg/(m2?d),respectively.Dry deposition accounted for about 25% of the Cu in the Qingcaosha Reservoir.更多还原