离子色谱法测定PM_(2.5)中水溶性无机阴离子

Determination of Water-soluble Anion in PM2.5 by Ion Chromatogram

利用戴安ICS-900离子色谱仪对PM2.5中水溶性无机阴离子F-、Cl-、NO2-、NO3-和SO42-进行了分离测定.5种离子的线性相关系数r>0.996,6次测试的相对标准偏差小于3.34%,F-、Cl-、NO2-、NO3-和SO42-的检测限分别为0.003 8、0.006 1、0.003 8、0.025 4和0.061 1 mg·L-1.该方法操作简单、准确、快速,适用于同时测定PM2.5中的水溶性无机阴离子.

The Dionex ICS-900 ion chromatography was used to analyze the F^-, Cl^-, NO2^-, NO3^- and SO4^2- in PM2.5. Linearity between the peak areas and concentrations of their respective water-soluble anions was found to be good in the definite ranges for the 5 ions, with the correlation coefficients （r） larger than 0.996. The relative standard deviations were less than 3.34%. The detection limits for F, CI, NO2^-, NO3^- and SO4^2- were 0.0038, 0.0061, 0.0038, 0.0254 and 0.0611 mg·L^-1, respectively. This method is easy to operate and the results accurate. With its fast detection abilities it is suitable for simultaneous determination of water-soluble anions in PM2.5.