广州市酸雨现状及离子组成特征分析

Present Situation and Major Ions in Acid Rain in Guangzhou

以2004-2008年广州市降水样品监测资料为基础对广州市降水的化学特征进行了分析，结果表明降水样品pH分布范围在4．83～4．93。降水的酸雨频率在76％～83％之间，降水中的主要阳离子是Ca^2＋和NH4^＋，主要阴离子为SO4^2-和NO3^-酸雨类型为硫酸塑和硝酸型并重。

The chemical characteristic of wet precipitation at Guangzhou was studied on the basis of monitoring data measured from 2004 to 2008 in the paper. The annual mean pH varied from 4.83 to 4.93.76 %-83 % of the total samples have pH less than 5.60. Further analysis showed that SO42- and NO3 were the main anions, white Ca and NH4. The pollution of acid rain was caused by SO42- and NO3- as well.