上海市近16年湿沉降化学特征分析  

Characteristics of Chemical Composition of Wet Deposition during Recent Sixteen Years in Shanghai

作　　者：黄银芝[1] 张明旭[2] 郑晓红[2] 

机构地区：[1]东华大学,上海201620 [2]上海市环境监测中心,上海200030

出　　处：《城市环境与城市生态》2008年第6期1-3,共3页Urban Environment & Urban Ecology

摘　　要：对上海市1992-2007年湿沉降监测结果进行研究,16年来,上海市湿沉降主要呈现以下特征:pH总体呈现下降趋势,酸雨频率呈现上升趋势;2002年起升幅很大;硫酸根离子和钙离子浓度总体呈下降趋势,2003年后,各离子浓度都有一定程度下降;钙离子在总阳离子中的比例总体上明显下降,铵离子与总阳离子的百分比总体上呈上升趋势;硫酸根离子在总阴离子中的比例有所下降,硝酸根离子与总阴离子的百分比则一直呈上升趋势;硫酸根与硝酸根年均值的比值总体上呈明显的下降趋势,表明硫酸型在逐渐减弱;钙离子与铵离子的比值总体上也呈明显的下降趋势。Based on the precipitation monitoring data during the years from 1992 to 2007 in Shanghai,the characteristics of wet deposition during these 16 years were studied and the following conclution was drawn:the value of pH declined,while acid rain frequency increased. They have varied dramatically especially since 2002. The concentrations of Ca2+ and SO2-4 have declined; the concentration of most ions apparently declined after 2003. The ratio of Ca2+ to the total cation has declined,while the ratio of NH+4 increased; and the ratio of SO2-4 to the total anion declined,while NO-3 increased; the ratio of SO2-4 to NO-3 has declined,which means the influence of sulfer to acid rain was weaker,while the ratio of Ca2+ to NH+4 declined.

关 键 词：上海市 湿沉降 化学特征 酸雨 离子组成 

分 类 号：X517[环境科学与工程—环境工程]