南京市冬季大气颗粒态汞的分布特征

采集了南京市2012年冬季4个功能区的PM2．5、PM10、TSP样品，对不同粒径大气颗粒物中的颗粒态汞测试。结果表明，南京冬季大气颗粒物TSP中汞的质量浓度为49．26 pg/m3～257．14 pg/m3，平均质量浓度为161．27 pg/m3；PM10中汞的质量浓度为44．82 pg/m3～228．29 pg/m3，平均质量浓度为147．38 pg/m3；PM2．5中汞的质量浓度为35．98 pg/m3～178．58 pg/m3，平均质量浓度为104．10 pg/m3。不同功能区大气颗粒态汞质量浓度的分布趋势为：交通综合区＞旅游区＞住宿综合区＞商业区。大气颗粒态汞60％以上存在于可吸入肺的PM2．5中，细颗粒物富集汞的能力比粗颗粒物强。

Distribution Characteristics of Particulate Mercury in Atmosphere of Nanjing during Winter

The samples of the PM2.5, PM10, TSP were collected in four functional sites of Nanjing during winter in 2012 , and the particular mercury concentrations in different size were analyzed .The results indicated that the mercury concentrations of TSP were 49.26 pg/m3 ~257.14 pg/m3 , the average concentration was 161.27 pg/m3.The mercury concentrations of PM10 were 44.82 pg/m3 ~228.29 pg/m3, the average concen-tration was 147.38 pg/m3.The mercury concentrations of PM2.5 were 35.98 pg/m3 ~178.58 pg/m3, the aver-age concentration was 104 .10 pg/m3 .The sequence of atmospheric particulate mercury concentration in different functional areas was：traffic district 〉tourist area 〉residential district 〉business district .More than 60%of particulates mercury was combined with fine aerosol , which can be inhaled into the lungs .The fine particulate matters enrich mercury much easier than the coarse particles .