电化学冷蒸气发生-原子荧光光谱法在鲜牛奶痕量汞分析中的应用  

DETERMINATION OF TRACE MERCURY IN MILK BY ELECTROCHEMICAL COLD VAPOR GENERATION COUPLED WITH ATOMIC FLUORESCENCE SPECTROMETRY

作　　者：戚琦[1] 范玉兰[1] 薛珺[1] 李勋[1] 

机构地区：[1]赣南师范学院化学与生命科学学院,江西赣州341000

出　　处：《食品研究与开发》2009年第10期103-105,共3页Food Research and Development

基　　金：江西省自然科学基金资助项目(2007GZH0377)

摘　　要：在断续流动条件下,采用自制的电化学流通池作为汞蒸气发生器,建立电化学冷蒸气发生法-原子荧光光谱联用技术对汞的分析方法。确定仪器的最佳条件,探讨了酸介质、电解电流等对测定结果的影响。在选定的操作条件下,汞的检出限为1.5ng/L。对1μg/LHg测定的相对标准偏差为2.3%(n=11)。方法应用于鲜牛奶中汞的测定,样品加标回收率在96%～104%之间。A sensitive method for determination of mercury was developed using an intermittent flow electrochemical cold vapor generation coupled with atomic fluorescence spectrometry （ECVG-AFS）. The mercury vapor was generated in the electrochemical flow cell. The operating conditions were optimized such as the concentration of sulfuric acid and the electrolytic current. The calibration curve was linear up to 5 μg/L Hg. A detection limit of 1.5 ng/L Hg and a relative standard deviation of 2.3 % for 1μg/L Hg were obtained. The method has been applied to the determination of trace mercury in milk, and the recovery was intherangeof 96 %--104 %.

关 键 词：断续流动 电化学冷蒸气发生 原子荧光光谱 鲜牛奶 汞 

分 类 号：O657.31[理学—分析化学] X132[理学—化学]