春季南充城区PM_(10)污染水平及其水溶性离子特征研究

Water-Soluble Ion Characteristics of Inhalable Atmospheric Particulates in Nanchong

采用中流量颗粒物采样器采集了60个可吸入颗粒物(PM10)环境样品,并用离子色谱法(IC)对所采集样品中的8种水溶性离子组成特征进行了分析。结果显示,春季南充城区空气质量良好,PM10中8种水溶性离子浓度大小为SO2-4>NO-3>Ca2+>Na+>Cl->K+>F->Mg2+。其中SO2-4、NO-3和Ca2+的平均质量浓度分别占总水溶性无机离子(TWSII)的62.4%、23.9%和4.7%。NO-3和SO2-4及Ca2+和Mg2+具有良好的相关关系,燃煤源对PM10的贡献大于机动车移动排放源的贡献;水溶性无机离子主要以NaCl、MgSO4和Mg(NO3)2的形式存在。

The eight kinds of water -soluble ions （F-、Cl-、NO3 -、SO4 2-、Ca2＋、Na＋、K＋、Ca2＋ and Mg2＋）of the 60 sampled specimens were analyzed with the ion chromatographic （IC）.The results show that the air quality in Nanchong was good in spring,and the mass concentrations of eight water-soluble ions in PM10 was ranked as SO4 2-〉NO3 -〉Ca2＋〉Na＋〉Cl-〉K＋〉F-〉Mg2＋,which may be in the form of NaCl,MgSO4 ,Mg （NO3）2 and so on.SO42-,NO3 -and Ca2＋,occupied respectively 62.4%,23H9%and 4.7%of the total water-soluble inorganic ions （TWSII）with mean concentrations of 27.4μg/m3N,10.5μg/m3N and 2.1μg/m3N.NO3 -and SO4 2-,Ca2＋and Mg2＋may have the same sources according to the correlation coefficient analyzed,which also demonstrated the stationary emission sources contributed more to the PM10 pollution than the mobile emission sources.