为研究日喀则不同粒径大气颗粒物中水溶性无机离子的组成特征，利用Andersen分级撞击式采样器在夏、冬季进行大气颗粒物分级采样，采用离子色谱测定NH＋4、Ca2＋、K＋、Mg2＋、Na＋、SO2－4、NO－3和Cl－等8种离子浓度．结果表明，夏、冬季总离子浓度分别为9648±3030、4925±1138 ng·m－3．夏季离子浓度高低顺序为Cl－﹥Ca2＋﹥NH＋4﹥Na＋﹥SO2－4﹥NO－3﹥K＋﹥Mg2＋，Cl－、Ca2＋、NH＋4和Na＋占总离子浓度的比重为74?9％；冬季水溶性无机离子浓度高低顺序为Cl－﹥SO2－4﹥NH＋4﹥NO－3﹥Ca2＋﹥Na＋﹥K＋﹥Mg2＋，Cl－、SO2－4、NH＋4和NO－3占总离子浓度的比重为88．0％．夏、冬季大气颗粒物中所有水溶性无机离子的粒径分布均成双峰型．夏季，大气颗粒物中SO2－4与Mg2＋（r＝0．951）、Ca2＋（r＝0．947），NO－3与Mg2＋（r＝0．904）、Ca2＋（r＝0．843），在0．01水平（双侧）上均显著相关；冬季，细粒子中K＋与Cl－（r＝0．740）、SO2－4（r＝0．929）及NO－3（r＝0．920），在0．01水平（双侧）上显著相关．
To investigate the size distributions of water?soluble inorganic ions in PM in Shigatse, samples were collected by Thermo Scientific Andersen impactor in summer and winter. Eight water?soluble inorganic ions, including NH+4 , Ca2+, K+, Mg2+, Na+, SO2-4 , NO-3 and Cl-were analyzed by IC. The results showed that concentrations of all ions were 9648 ± 3030 ng·m-3 in winter and 4925 ± 1138 ng·m-3 in summer. Variations of ion concentrations were observed in the following order: Cl-﹥Ca2+﹥NH+4 ﹥Na+﹥SO2-4 ﹥NO-3 ﹥K+﹥Mg2+in summer, and Cl-﹥SO2-4 ﹥NH+4 ﹥NO-3 ﹥Ca2+﹥Na+﹥K+﹥Mg2+in winter. Concentrations of Cl-, Ca2+, NH+4 and Na+accounted for 74.9%of all the ions in PM in summer, and those of Cl-, SO2-4 , NH+4 and NO-3 accounted for 88.0% of all the ions in PM in winter. Correlations of SO2-4 and Mg2+( r=0.951) , Ca2+( r=0.947) were significant at the 0.01 level, and those of NO-3 and Mg2+(r=0.904), Ca2+(r=0.843) were also significant at the 0.01 level in summe. Correlations of K+ and Cl-(r=0.740), SO2-4 (r=0.929), NO-3(r=0.920) were significant at the 0.01 level.
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