渤海近海大气颗粒物金属元素的入海通量

Input fluxes of metal elements in atmospheric particulate in Bohai coastal waters

采集了渤海近海岛屿1 a的大气TSP样品,利用原子吸收光谱仪测定样品中Pb、Zn、Cu、Cd、Fe、Mn、V等金属元素含量,通过模型计算各元素干湿沉降通量,分析大气颗粒物入海通量的季节性变化,结果显示各元素的干沉降通量年均值分别为:Pb 34.344μg/(m2.d),Zn 89.273μg/(m2.d),Cu 0.821μg/(m2.d),Cd 1.577μg/(m2.d),Fe 3784.536μg/(m2.d),Mn 135.000μg/(m2.d),V729.432 mg/(m2.d);湿沉降通量年均值分别为:Pb 0.380 ng/(m2.d),Zn 0.854 ng/(m2.d),Cu 0.008 ng/(m2.d),Cd 0.018 ng/(m2.d),Fe 1.757 ng/(m2.d),Mn 0.070 ng/(m2.d),V0.243μg/(m2.d);金属元素的干沉降通量远远大于湿沉降通量,干沉降主导渤海近海大气物质的入海输入过程;各元素的干湿沉降通量有明显季节性变化,其中Pb、Cd、Fe、V沉降通量冬季最大,其中Cd、Fe沉降通量在夏季有所增加;Zn、Cu、Mn沉降通量则以秋季最大,这种季节-元素组合特征应在海域环境质量和生态系统变化研究中予以关注。

According to the analysis of metal elements in the atmospheric particulate samples during a year in the Puti Island of Bohai coastal waters,the dry and wet deposit fluxes of atmospheric particles were studied.The results showed that the average annual input fluxes were Pb 34.344 μg/（m2·d）,Zn 89.273 μg/（m2·d）,Cu 0.821 μg/（m2·d）,Cd 1.577 μg/（m2·d）,Fe 3784.536 μg/（m2·d）,Mn 135.000 μg/（m2·d）,V 729.432 mg/（m2·d） in the dry deposit and Pb 0.380 ng/（m2·d）,Zn 0.854 ng/（m2·d）,Cu 0.008 ng/（m2·d）,Cd 0.018 ng/（m2·d）,Fe 1.757 ng/（m2·d）,Mn 0.070 ng/（m2·d） in the wet deposit.The input fluxes of dry deposit were much higher than that of wet deposit with distinguish seasonal variations.The elements of Pb,Cd,Fe and V had the highest input flux in winter,while Zn,Cu and Mn in autumn,and Cd and Fe had an unique increase of input flux in summer.This seasonal variation of metal elements input fluxes to the ocean should be taken into the consideration in the marine environment researches.