离子色谱–质谱法测定水质中六价铬的方法研究  

Determination of hexavalent chromium in water by Ion chromatography-mass spectrometry

作　　者：杨敏[1] 黄丽[2] 罗展纲[1] 张文改[2] 

机构地区：[1]广东省深圳市龙岗区疾病预防控制中心,广东深圳518172 [2]广东省东莞市疾病预防控制中心,广东东莞523000

出　　处：《中国卫生检验杂志》2011年第7期1628-1630,共3页Chinese Journal of Health Laboratory Technology

摘　　要：目的:建立离子色谱分离、电喷雾质谱检测水质中六价铬的方法。方法:水样经0.22μm微孔滤膜过滤后直接进样,以20 mmol/L KOH溶液为流动相,IonPac AS21 Analytical 2×250 mm色谱柱分离六价铬,使用单四级杆质谱,选择离子模式检测,监测离子为m/z118、117、101、85,其中117为定量离子。结果:Cr(Ⅵ)的线性范围为0μg/L～100.0μg/L,方法的检测限为0.57μg/L。在空白水样中分别添加4.0μg/L、10.0μg/L、50.0μg/L的六价铬,测得平均回收率(n=6)依次为102%、101%、100%,相对标准偏差分别为1.27%、2.82%、1.63%。与分光光度法对照表明,其结果无显著性差异。结论:该方法操作简便,快速,准确度和灵敏度高。Objective：A method for the determination of hexavalent chromium in water by ion chromatography-electrospray mass spectrometry was established.Methods： Sample was filtrated by a 0.22 μm micropore filter before injection.The separation of Cr（Ⅵ） was performed on a IonPac AS21 Analytical 2×250 mm column using solution of 20 mmol/L KOH as mobile phase,and the detection of Cr（Ⅵ） was carried out under selected ion monitoring（SIM） mode with monitoring ions of m/z118,117,101,85 and quantative ion of 117.Results： The calibration curve of Cr（Ⅵ） was linear in the range of 0 μg/L～100.0 μg/L with the method detection limit of 0.57 μg/L.The avarge recoveries（n=6） of Cr（Ⅵ） from blank samples spiked with three levels of 4.0 μg/L,10.0 μg/L,50.0 μg/L were 102%,101%,100% respectively,and the corresponding relative standard deviation were 1.27%,2.82% and1.63%.Comparing with the results by spectrophotometry,there was no significant difference.Conclusions： The method is simple,rapid,accurate and highly sensitive.

关 键 词：六价铬 水质 离子色谱-质谱 

分 类 号：O657.63[理学—分析化学]