对武威市2013年7月至2014年6月收集的降水样品pH值、电导率和主要阴阳离子浓度进行测定和分析。结果表明：（1）降水样品的pH值6.69～8.84，平均值7.52。降水样品电导率33.9～766 μS·cm-1，平均182.07 μS·cm-1。（2）电导率冬季 >春季 >夏季 >秋季，pH值春季 >夏季 >秋季 >冬季。pH值与电导率呈显著的负相关，与风速呈正相关；电导率与降水量呈显著的负相关，与风速呈显著的负相关。（3）pH值和电导率都会随着沙尘事件的发生表现出增加的趋势。当沙尘事件发生的情况下，Na+、K+、Mg2+、Ca2+、SO42-、Cl-和NO3+的离子浓度都呈现增加的趋势，但从各离子浓度变化幅度对沙尘事件的响应来看，Na+、K+和NO3-对沙尘天气比较敏感，反应强烈。
This research analyzed the pH, electric conductivity and the concentrations of main anion and cation of precipitation samples collected from July 2013 to June 2014 in Wuwei. The results showed that: (1)The pH of the precipitation samples ranged from 6.69 to 8.84, and the average was 7.52. The range of electric conductivity was 33.9-766 μS·cm-1, and the average was 182.07 μS·cm-1. (2)The order of electric conductivity was winter >spring >summer >autumn, and the order of pH was spring>summer>autumn>winter. The pH and electric conductivity showed a significant negative correlation. The pH showed a significant positive correlation with the wind speed. The electric conductivity showed significant negative correlation with the precipitation and wind speed. (3) The pH and EC showed an increasing trend with the occurrence of sand-dust events. When the sand-dust events occurred, the concentrations of Na+, K+, Mg2+, Ca2+, SO42-, Cl- and NO3- showed increasing trend, But Na+, K+ and NO3 is relatively more sensitive to sand-dust events.
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