呼和浩特市降水化学特征分析

对2006年呼和浩特市降水离子监测资料进行分析,结果表明:降水呈碱性,季节分布明显,夏季降水集中且pH值为全年最低,冬季降水量少,pH值较高;SO42-离子为主要致酸离子,阳离子中Ca2+,Mg2+离子的浓度很高;降水中主要成分之间相关性显著,Ca2+的中和作用较强;降水气团的后向轨迹分析表明蒙古国的沙漠地区是呼和浩特冬春季碱性降水的主要来源,夏季较低的pH值降水则部分源于我国的华中、华北地区的酸性污染物中长距离输送。

Analysis on Chemical Characteristics of precipitation in Hohhot

The ions monitoring data of precipitation were analyzed in Hohhot in 2006.the result showed that the precipitation in Hohhot was alkaline,the season distribution was obvious,the precipitation was concentrated in summer and less in winter,the pH value is lower in summer and higher in winter,SO42-still was the main acid ion,the ion concentration of Ca2＋and Mg2＋ were very high,the main elements of precipitation have great correlation,Ca2＋ shown strong neutralizing effect,the analysis on rear trajectory of precipitation air mass showed that the desert in Mongolia is a major source of alkaline precipitation in winter and spring,while the low pH value in summer is due to the long-distance transmission of acidic pollutants from China＇s central and eastern area.