黄海及东海海域大气降水中的重金属

于2000年5月至2002年5月在黄海的千里岩岛和东海的嵊泗群岛两个采样点共采集了120多个降水样品，测定了pH值和重金属Cu、Pb、Zn、Cd的含量。结果表明，两个采样点的降水样品中重金属的浓度有明显的季节变化，冬季的浓度高于夏季。千里岩岛降水中的重金属的浓度明显高于嵊泗群岛，尽管其降雨量小于嵊泗群岛，千里岩岛大气降水中重金属的沉降通量仍大于嵊泗群岛。在千里岩岛，Pb以干沉降为主，而Cu、Zn、Cd的湿沉降占明显优势，表明在黄海海域湿沉降对重金属元素向海洋的输送起重要的作用。

HEAVY METALS IN PRECIPITATION FROM THE YELLOW SEA AND THE EAST CHINA SEA REGIONS

120rainwater samples were collected from Qianliyan island(YellowSea)and Shengsi island(East China Sea)from May2000to May2002.The samples were analyzed for pH values and the concentrations of the heavy metals(Cu?Pb?Zn and Cd).The results indicate that the concentrations of most heavy metals in rainwater showa clear seasonal variation with higher levels in winter and lower levels in summer.Generally,the heavy metal concentrations in rainwater are also higher at Qianliyan island than those at Shengsi,and the yearly atmospheric wet depositions fluxes of heavy metals are larger than those at Shengsi island,in spite of the annual rainfall is smaller at Qianliyan relative to the Shengsi island.At Qianliyan,Pb is input into the sea mainly by dry deposition;whereas for Cu,Zn and Cd,wet deposition are overwhelming,indicating that atmospheric wet deposition plays an important role for heavy metals transported to the sea in the YellowSea regions.