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对南京市城区与郊区秋季PM10中水溶性离子的浓度水平,变化规律及其相关性进行分析。结果表明：水溶性离子是南京市PM10的重要组成部分,占PM10总量的26.8%～49.5%;NO3-、SO24-为南京PM10中离子的主要成分同时SO24-与PM10的相关性高,在郊区与城区相关系数分别为0.97与0.98;土壤源对Mg2＋的贡献多于海洋气溶胶。郊区与城区非海盐Mg2＋和Ca2＋的比值分别为0.0308～0.0557与0.0314～0.0558,与中国北方沙漠地区相异,说明观测期间南京大气PM10主要受局地源影响;南京城、郊NO3-/SO24-均值分别为0.74和0.80,说明南京市城郊PM10中NO3-与SO24-更多地来自于机动车尾气排放。“,”It was researched that the concentration level,change law and correlativity of the water soluble ions in PM10 in autumn in the urbon and suburban areas of Nanjing.The results showed that water soluble ions were an important part of PM10 in Nanjing,which accounted for 26.8% to 49.5% of PM10 total amount;NO-3,SO2-4 were the main component of PM10 in Nanjing while the correlation between SO2-4 and PM10 was high,in suburban and urban areas correlation coefficients were 0.97 and 0.98;the soil source contribution to Mg2+ was more than marine aerosols.Suburban and urban non-sea salt Mg2+/Ca2+ ratios were 0.0308~0.0557 and 0.0314~0.0558,which were different from desert regions of northern China,showing that PM10 is mainly affected by local source;suburban and urban NO-3/SO2-4 ratios(average) were 0.74 and 0.80,showing that NO-3 and SO2-4 in PM10 in Nanjing were mainly from vehicle exhaust emissions.