摘要
对离子色谱测定大气颗粒物PM2.5中Na^＋、K^＋、Mg^2＋、Ca^2＋、NH4＋等5种可溶性阳离子的方法作探讨，试验结果表明：石英滤膜的空白值较特氟龙滤膜高，尤其是Na^＋、Ca^2＋；样品前处理的超声时问以60min为最佳；优化方法后标准曲线的相关性达0．999以上，对标准样品的测定值均在保证值范围内。当采样体积为标况下20m^3时，方法检出限Na^2＋、NH4＋为0．05μg／m^3，K^＋、Mg^2＋、Ca^2＋为0．1μg／m^3，实际样品平行测定6次的RSD≤1．3％，加标回收率范围为87．5％-109％。
Determination of five water-soluble cations, Na ＋ , K ＋ , Mg2＋ , Ca2＋ and NHf in atmospheric particulates PM2.5 by ion chromatography was investigated. The result showed that the blank value of Quartz membrane was higher than that of Teflon membrane especially for Na＋ and Ca2＋ determination. The best ultra- sonic time of sample pretreatment was 60 rain. Correlation coefficient of standard curve of five cations were as high as 0. 999 after optimizations. The determination values of the standard sample were within the guaranteed values. When the sampling volume was 20 m3 of standard conditions, the detection limit of Na ＋ , NH4＋ was 0.05 μg/m3 , the detection limit of K ＋ , Mg2＋ , Ca2 ＋ was 0.1 μg/m3. On the real sample testing, the precision was lower to 1.3% and the recovery rates were between 87.5% and 109% .
出处
《环境监测管理与技术》
2013年第5期44-47,共4页
The Administration and Technique of Environmental Monitoring
