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采用离子色谱法同时测定了大气可吸入颗粒物PM10中的多种水溶性阴阳离子。样品采用超纯水超声萃取各种水溶性离子,优化的萃取溶液体积为40mL,萃取时间为15 min,萃取液用0.45μm纤维滤膜过滤,阴、阳离子分别采用响应的离子色谱柱分离,流动相分别采用3.6 mmol/L Na2CO3溶液+0.6 mmol/L NaHCO3溶液,2 mmol/L HNO3溶液,其中阳离子检测未使用抑制器,电导检测器检测。14种离子在一定浓度范围内线性关系良好,相关系数r都>0.999,F-,BrO3-,Cl-,NO2-,Br-,NO3-,PO42-,SO42-等8种阴离子的检出限分别为1.5,7.5,1.6,4.2,6.5,12.5,10.4,3.3μg/L,Li+,NH4+,Na+,K+,Mg2+,Ca2+等6种阳离子的检出限分别为4.6,12.3,8.5,19.8,12.4,17.9μg/L,平均回收率为92.3%~99.7%,标准偏差小于5%。方法适用于同时测定PM10中的多种水溶性离子。
Simultaneous determination of various water-soluble anions and cations in particulate matter PM10 in the atmosphere by ion chromatography. The sample was ultrapure water ultrasonic extraction of various water-soluble ions, the optimal volume of the extraction solution was 40mL, the extraction time was 15 min, the extract was filtered with 0.45μm fiber membrane, anion and cation were separated by ion-exchange reaction column, flow Phase respectively using 3.6 mmol / L Na2CO3 solution +0.6 mmol / L NaHCO3 solution, 2 mmol / L HNO3 solution, wherein the cation detection without the use of suppressor, conductivity detector detection. The linearity of 14 kinds of ions in a certain range of concentration was good with the correlation coefficients r> 0.999. The detection limits of eight anions such as F-, BrO3-, Cl-, NO2-, Br-, NO3-, PO42-, SO42- The detection limits of six kinds of cations, such as 1.5, 7.5, 1.6, 4.2, 6.5, 12.5, 10.4 and 3.3μg / L, Li +, NH4 +, Na +, K +, Mg2 + and Ca2 + were 4.6,12.3,8.5,19.8, 12.4,17.9μg / L, the average recovery was 92.3% ~ 99.7%, the standard deviation was less than 5%. The method is suitable for the simultaneous determination of various water-soluble ions in PM10.