Spectrochemical determination of trace As, Fe, Hg, Mn, and Pb by an argon-stabilized U-shaped DC arc |
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Authors: | D M Markovi? I Novovic? |
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Institution: | (1) Institute of Physics, P.O. Box 68, 11080 Belgrade, Pregrevica 118, Serbia |
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Abstract: | Argon-stabilized U-shaped DC arc with a system for aerosol introduction was used for the determination of As, Fe, Hg, Mn,
and Pb. By applying a computer program performing a time integration of the registered signals and by optimizing the working
conditions of an U-shaped arc plasma, the detection capability for As, Fe, Hg, Mn, and Pb was improved, which contributed
to the lowering of the detection limits. The lowest detection limits for Fe, Mn, and Pb were achieved during an integration
time of 20 s, and for As and Hg during an integration time of 30 s, and their values were 1.1, 0.1, 0.9, 15, and 2.6 ng/mL,
respectively. The detection limits obtained by our method with optimal integration times were compared with the detection
limits obtained using other methods: inductively coupled plasma-atomic emission spectrometry (ICP-AES), directly coupled plasma-atomic
emission spectrometry (DCP-AES), microwave-induced plasma-atomic emission spectrometry (MIP-AES), inductively coupled plasma-mass
spectrometry (ICP-MS), and an improved thermospray flame furnace atomic absorption spectrometry (TS-FF-AAS).
The text was submitted by the authors in English. |
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