液相色谱-质谱法对饮用水中六价铬的测定  

Determination of Hexavalent Chromium in Drinking Water by High Performance Liquid Chromatography-Mass Spectrometry

作　　者：王骏[1] 胡梅[1] 张卉[1] 张喜琦[1] 玄国东[1] 祝建华[1] 

机构地区：[1]山东省产品质量监督检验研究院,山东济南250100

出　　处：《分析测试学报》2009年第12期1468-1470,共3页Journal of Instrumental Analysis

摘　　要：建立了液相色谱分离、电喷雾质谱测定饮用水中六价铬的方法。水样经微孔滤膜过滤后直接进样，以乙腈-1．5mmol／L四丁基氢氧化铵水溶液为流动相，Xterra^TM MS C18色谱柱分离六价铬，使用单四极杆质谱，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。Cr（VI）的线性范围为1．0～100．0μg/L，方法定量下限为1μg/L。在空白水样中分别添加1．0、2．0、10．0μg／L的六价铬，测得平均回收率（n=5）依次为91％、94％、97％，相对标准偏差分别为12．2％、7．4％、3．5％。测定了42个饮用水样品，其中17批检出六价铬，检出量为1．2～15．4μg/L。A method for the determination of hexavalent chromium in drinking water by high performance liquid chromatography- electronspray mass spectrometry was established. Sample was filtrated by a 0. 45 μm mieropore filter before injection. The separation of Cr （ VI ） was performed on a XterraTM MS C18 column using aeetonitrile- 1.5 mmol/L tetrabutyl ammonium hydroxide solution as mobile phase, and the detection of Cr （ VI ） was carried out under selected ion monitoring （ SIM ） mode with monitoring ions of m/z 118, 117, 101, 85 and quantative ion of 117. The calibration curve of Cr（VI） was linear in the range of 1.0 - 100.0 μg/L with a quantitation limit of 1 μg/L. The avarge recoveries（ n = 5 ） of Cr（ VI ） from blank samples spiked with three levels of 1.0, 2.0, 10. 0 μg/L were 91% , 94% , 97% , respectively, and the corresponding relative standard devia- tion were 12.2% , 7.4% , 3.5% , respectively. 42 drinking water samples were used to test, and Cr（ VI）was detected in 17 samples with the concentration of 1.2 - 15.4 μg/L.

关 键 词：六价铬 饮用水 液相色谱-质谱 

分 类 号：O657.63[理学—分析化学]