• Spectroscopy and Spectral Analysis
  • Vol. 29, Issue 5, 1431 (2009)
YIN Xue-bin1、*, LU Xiao-qi1, YAO Chun-xia1, SONG Jing1, QIAN Wei1, LUO Yong-ming1, LIANG You-qing2, and SUN Li-guang2
Author Affiliations
  • 1[in Chinese]
  • 2[in Chinese]
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    DOI: Cite this Article
    YIN Xue-bin, LU Xiao-qi, YAO Chun-xia, SONG Jing, QIAN Wei, LUO Yong-ming, LIANG You-qing, SUN Li-guang. A Study on Decreasing the Instrument Detection Limit of Atomic Fluorescence Spectrometry(AFS-930)for Hg[J]. Spectroscopy and Spectral Analysis, 2009, 29(5): 1431 Copy Citation Text show less

    Abstract

    In the present study, the detection limit of atomic fluorescence spectrometry (AFS-930) was decreased to 2 ng·L-1 (n=6) based on several optimizing modifications, including that the sub-high voltage of photomultiplier tube and the current of hollow-cathode lamp were elevated to 280 V and to 30 mA, respectively, and the height of atomization cell was set as 10 mm; In addition, the concentration of KBH4 was decreased to 0.5% (KOH 0.2%). With the optimized parameters, a good standard curve of Hg concentration versus intensity of fluorescence (If) could been obtained readily, after that, a 4-ng·L-1-Hg water samples was measured accurately with a little relative standard deviation (RSD) of <5%, while for approximately 2-ng·L-1-Hg waters the RSD varied within a wide range of 10.9%-27.2%, likely due to the absorption of Hg by polyethylene vessels used in this study and/or due to the contamination by analysis grade reagents used in this study. By using low-absorption polytetrafluoroethylene (PTFE) materials and the guaranteed reagents, the instrument detection limit was further decreased to 1 ng·L-1(n=10).
    YIN Xue-bin, LU Xiao-qi, YAO Chun-xia, SONG Jing, QIAN Wei, LUO Yong-ming, LIANG You-qing, SUN Li-guang. A Study on Decreasing the Instrument Detection Limit of Atomic Fluorescence Spectrometry(AFS-930)for Hg[J]. Spectroscopy and Spectral Analysis, 2009, 29(5): 1431
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