石家庄市酸雨污染特征及其成因分析

根据2008-2012年的酸雨监测数据,研究了石家庄市5年来大气降水量、pH值、电导率及降水化学组成的变化规律和趋势.结果表明：石家庄市5年来年均降水量为557.4 mm,降水集中在6-9月份.降水pH值最大为7.98,最小为4.41,年均值为5.88.电导率为12.37～18.03ms/m,年均值为14.96ms/m,且与pH值呈一定的负相关性.酸雨频率年均值为4.35％,近2年没有酸雨发生.降水中阴离子浓度由高至低依次为SO42-,NO3-,Cl-,F-,阳离子浓度由高至低依次为Ca2＋,NH＋,Mg2＋,K＋,Na＋.石家庄市的酸雨类型由硫酸型向硫酸和硝酸混合型过渡.

Characteristics and cause analysis on acid rain pollution in Shijiazhuang City

According to the monitoring data of acid rain from 2009 to 2013 in Shijiazhuang City,the change regularity and trend of atmospheric precipitation,pH,electrical conductivity and precipitation chemistry are studied.The results show that the average annual rainfall in recent five years is 557.4 mm,and rainfall happens mostly at June,July,August and September.The maximum pH value of rainfall is 7.98,the minimum is 4.41,and the average value is 5.88.The electrical conductivity is 12.37～18.03 ms/m,and the annual average value is 14.96 ms/m,which is negative correlation with pH value.Acid rain frequency average is 4.35 ％,and there is no acid rain in nearly two years.The anion concentration in precipitation from high to low is SO42-,NO3-,Cl-,F-,and the action concentration from high to low is Ca2＋,NH4＋,Mg2＋,K＋,Na＋.The acid rain type in Shijiazhuang City is changing from sulfuric acid to the mixture of sulfuric acid and nitric acid.