电化学冷蒸气发生-原子荧光光谱法测定人发中的痕量汞

Determination of trace mercury in human hair by electrochemical cold vapor generation coupled with atomic fluorescence spectrometry

采用自制的电化学流通池作为汞蒸气发生器，以玻碳为阴极材料，结合原子荧光光谱法，在断续流动条件下，建立了电化学冷蒸气发生法．原子荧光光谱联用技术（ECVG-AFS）对汞的分析方法。在优化的实验条件下，汞在0～5．0μg／LYE围内荧光强度与浓度呈良好的线性关系，汞的检出限为1．2ng/L。对1μg/L Hg测定的相对标准偏差为1．8％（n=11）。可用于人发标准样品中汞的测定。

An extremely sensitive method for the determination of mercury was developed using an intennittent flow electrochemical cold vapor generation coupled with atomic fluorescence spectrometry （ECVG-AFS）. The mercury vapor was generated on the surface of a glassy carbon cathode in the electrochemical flow cell. The operating conditions for the electrochemical generation of mercury vapor were investigated in detail. Under the optimal conditions, the calibration curve was linear up to 5 μg/L Fig at 1.5 A. A detection limit of 1.2 ng/L and a relative standard deviation of 1.8 % for 1 μg/L Hg were obtained. The accuracy of method was verified by the determination of mercury in the certified reference human hair.