4.7 Article

Ultrasensitive determination of mercury by solution anode glow discharge atomic emission spectrometry coupled with hydride generation

Journal

CHINESE CHEMICAL LETTERS
Volume 31, Issue 10, Pages 2814-2818

Publisher

ELSEVIER SCIENCE INC
DOI: 10.1016/j.cclet.2020.03.055

Keywords

Solution anode glow discharge; Hydride generation; Atomic emission spectroscopy; Mercury

Funding

  1. Instrument Development Project of the Chinese Academy of Sciences [YZ201539]
  2. National Natural Science Foundation of China [21175145]
  3. Shanghai Technical Platform for Testing on Inorganic Materials [19DZ2290700]

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An innovative method for the ultrasensitive detection of mercury by solution anode glow discharge atomic emission spectroscopy (SAGD-AES) coupled with hydride generation (HG) was first investigated. In this method, the mercury vapor generated by the HG was transmitted to the SAGD through the miniature hollow tungsten tube for excitation and detected by a miniaturized spectrograph. A thorough parametric evaluation of the HG and SAGD system was performed, including the type and concentration of carrier acid, He flow rate, concentrations of NaBH4, discharge current and discharge gap. Under optimal operating conditions, the detection limit for Hg2+ achieved 0.03 mg/L, with a relative standard deviation of 1.1% at the Hg2+ concentration of 5 mg/L. Moreover, the correlation coefficient of the calibration curve was 0.9996 in the range between 0.1 and 10 mg/L. The accuracy and practicability of HG-SAGD-AES were verified by measuring GBW09101b (human hair), GBW10029 (fish), soil and rice samples. The results showed good agreement with the certified values and values from direct mercury analyzer (DMA). (C) 2020 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.

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