采集了太原市2013年4-12月大气干沉降样品,并使用了离子色谱仪分析了其中的水溶性无机阴阳离子,报道了干沉降中水溶性离子的化学特征、沉降通量和来源分析.结果表明,SO42-、Ca2+和NO3-是太原市干沉降的主要离子,浓度分别为4258.83、2388.45、1048.35 μg·g-1.干沉降中的水溶性离子浓度水平季节变化趋势为秋季＞夏季＞春季,变化趋势受到排放源和气象因素的影响.降尘通量和水溶性离子沉降通量分别为323.72 mg·(m2· d)-1和21.43 mg· (m2·d)-1.干沉降中硫、氮沉降通量分别为1.55 t·(km2·a)-1和0.39 t·(km2·a)-1,高于国内其他地区的研究结果.水溶性离子的相关性分析和特征比值结果显示,干沉降中的NO3-和SO42-主要受到燃煤排放影响;Ca2+和Mg2+的主要来源除了扬尘外,燃煤也有贡献.
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