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Citation: TAO Chen, LI Chun-Sheng, CHU Wei-Cheng, GAO Ran-Ran, ZHOU Zhi-Heng, LI Yun-Meng, MA Zhen-Yu, TIAN DI. Correction Method of Light Source Interference for Simultaneous Determination of Selenium and Lead by Non-dispersive Hydride Generation-Atomic Fluorescence Spectrometry[J]. Chinese Journal of Analytical Chemistry, ;2019, 47(1): 163-168. doi: 10.19756/j.issn.0253-3820.181542 shu

Correction Method of Light Source Interference for Simultaneous Determination of Selenium and Lead by Non-dispersive Hydride Generation-Atomic Fluorescence Spectrometry

1.
College of Instrumentation & Electrical Engineering, JiLin University, Changchun 130023, China;
2.
Beijing Bohui Innovation Optoelectronic Technology Co., Ltd, Beijing 102206, China;
3.
Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China

Received Date: 20 August 2018
Revised Date: 30 September 2018

Fund Project: This work was supported by the National Major Scientific Instruments and Equipment Development Special Funds (No. 2016YFF0103303)

Hollow cathode lamps (HCL) are the most commonly used excitation sources for hydride generation-atomic fluorescence spectrometry (HG-AFS). In general, there was lead (Pb) interference in selenium (Se) HCL. This kind of light source interference affected the accuracy of the detection results when Se and Pb simultaneously were determined by HG-AFS. In this work, the effects of light source interference were discussed and analyzed, and a light source interference factor method was proposed to correct the spectral interference. This method had many advantages including simple operation and high reliability, and appropriately reduced the purity of the cathode of the light source. The spectral interference of Se HCL was discussed. The conditions of simultaneous determination of Se and Pb in K₃[Fe(CN)₆]-KBH₄-HCl chemical generation system were optimized, and the influence of Pb interference in HCL of Se was discussed. In the concentration range of 2-50 μg/L, the detection limit of Se was 0.034 μg/L (r=0.9995), and the detection limit of Pb was 0.019 μg/L (r=0.9997). The method precisions were 0.85% (10 μg/L, Se,n=9) and 0.47% (10 μg/L, Pb, n=9), respectively. The feasibility of the method was confirmed by the simultaneous detection of national standard sample rice GBW10010 (GSB-1), wheat GBW10011 (GSB-2) and soy flour. The results of the light source calibration were consistent with the standard values.
- Atomic fluorescence spectroscopy,
- Selenium,
- Lead,
- Interference correction
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