铜陵市降水化学成份及其与大气污染关系分析

监测分析铜陵市降水的主要化学组成，结果表明ＳＯ２－４是降水中阴、阳离子量最高的离子，它是决定降水酸度的主导离子，ＮＯ－３对降水氢离子浓度也有一定影响，且铜陵市降水中ＮＯ－３的量高于一般酸雨区，阳离子中以Ｃａ２＋和ＮＨ＋４的量居高。其中ＳＯ２－４来源于大气中的ＳＯ２，Ｃａ２＋来源于大气中的ＴＳＰ，ＮＯ—３来源于大气中的ＮＯｘ。各单种离子含量高低不能决定降水氢离子浓度，氢离子浓度大小只取决于降水中阴、阳离子平衡状况。电导率是反映降水污染程度的一种指标，实际操作中行之有效，较为便捷。

Analysis of chemical component of precipitation and its relation with air pollution in Tong Ling city

Main chemical components of precipitation were monitored and analysed.The results showed that SO 2- 4 was dominant ion and it determined H +concentration of precipitation,its content is the highest in ion anion and ion cation;NO - 3 affected H +concentration of rain and its content was more than that of other ordinary acid rain area.In ion cation,content of Ca 2+ and NH + 4 were high.Among of them,SO 2- 4 came fron SO 2 in air,Ca 2+ came from TSP in air and NO - 3 came from NO x in air.Content of an ion did not decide H +concentration of precipitation and it only depended on balance of ion anion and ion cation in preipitation.Conductance rate was an effective quota to reflect pollution degree of preccipitation.