毛细管电泳-电感耦合等离子体质谱法对砷形态分析  

Speciation Analysis of Arsenic by Capillary Electrophoresis Coupled With Inductively Coupled Plasma Mass Spectrometry

作　　者：王泽邦 赵学玒[1] Wang Zebang;Zhao Xuehong(Institute of Automation,Tianjin University,Tianjin,300072,China)

机构地区：[1]天津大学精密仪器与光电子工程学院,天津300072

出　　处：《仪器仪表用户》2018年第7期24-25,17,共3页Instrumentation

基　　金：国家高技术研究发展计划(2014AA022305)

摘　　要：建立了使用毛细管电泳与电感耦合等离子体质谱联用技术(CE-ICP-MS)对5种形态的砷化合物砷甜菜碱(As B)、砷胆碱(As C)、三价砷(As3+)、二甲基砷(DMA)和一甲基砷(MMA)进行形态分析的实验方法。结果表明,使用摩尔体积比为4:1的50mmol/L H3BO3~12.5mmol/L Na2B4O7混合溶液作为缓冲溶液,在p H值为9.1,分离电压为18KV的实验条件下分析结果最为理想。5种砷化物的峰面积相对标准偏差(RSD)在5%以内,检出限(3S/N)为1.6ug/L^3.1ug/L。应用该方法成功地对虾肉中的砷化物进行了分析,回收率为88%~112%。该方法具有分析速度快、灵敏度高等优点,可用于虾肉样品中砷元素的形态分析。A CE-ICP-MS method applied to determination of As B,As C,As（Ⅲ）,DMA,MMA was Established. The results showed that using a molar ratio of 4：1 50 mmol/L H3 BO3~12.5 mmol/L Na2 B4 O7 solution as buffer solution, the best results were obtained under the conditions of p H 9.1 and separation voltage 18 KV. The relative standard deviation（RSD） of the peak areas of the five arsenides was within 5%, and the detection limit（3 S/N） was 1.6μg/L^3.1μg/L. The method was successfully applied to the analysis of arsenic in shrimp meat with the recovery rate of 88%~112%. The method has the advantages of high analysis speed, high sensitivity, and can be used for speciation analysis of arsenic in shrimp meat samples.

关 键 词：毛细管电泳 电感耦合等离子体质谱 形态分析 砷 

分 类 号：O657.8[理学—分析化学]