摘要
收集了常州市2008年全年的56次降水,并分析了它们的9种主要离子的浓度及pH值。全年降水的pH雨量加权平均值为4.76。降水酸度和大气中气态污染物及可吸入颗粒物呈正相关性。气态污染物及可吸入颗粒物的冲刷净化直接影响降水的pH值及其化学成分。SO42-、NO3-、Ca2+和NH4+是影响降水pH值的主要离子。常州市2008年的降水主要酸性离子SO42-和NO3-浓度明显高于我国降水背景点纳木错,但低于其他部分城市,表明常州市的大气环境受到了明显的人为污染,但污染程度相对较轻。常州市的环境空气质量在近20年内得到了明显的改善。
Fifty-six rain samples throughout the year of 2008 were collected in Changzhou. pH and the concentrations of main ion in rainwater were analyzed. The annual volume-weighted mean pH in rain was 4.76. pH in rainwater had a positive correlation with gaseous pollution and PM10 in the air respectively. The washout of gaseous and particle pollutant directly affected pH and compositions in rainwater, pH in rainwater was mainly determined by SO4^2- , NO3- , Ca2＋ and NH4＋. The concentrations of main acidic ion, SO4^2- and NO^3- in rainwater were lower than other cities, but higher than Nam Co＇s, meaning the atmospheric pollution in Changzhou was obvious, but relatively light. The atmospheric environment in Changzhou had been improved obviously during the previous two decades.
出处
《城市环境与城市生态》
CAS
CSCD
2010年第5期30-33,共4页
Urban Environment & Urban Ecology
关键词
酸雨
PH值
化学成分
大气污染物
常州市
acidic precipitation
pH
chemical composition
atmospheric pollutant
Changzhou
