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The use of Ca + Pd + Zr as modifiers in the determination of sulfur by HR-CS GF MAS with solid sampling

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Abstract

This paper proposes a universal combination of chemical modifiers for sulfur determination through carbon monosulfide (CS) monitoring by high-resolution-continuum source graphite furnace molecular absorption spectrometry and solid sampling analysis. Three certified reference materials containing sulfur (NIST 8414, 8415 and 1648a) and a variety of samples were submitted to the proposed method. The CS molecule was monitored at 258.056 nm using a platform coated with Zr and a combination of 10 μL Ca (1 g L−1) and 4 μL Pd (10 g L−1) placed over the sample. The best pyrolysis and vaporization temperatures were 400 °C and 2300 °C, respectively. Aqueous standard solutions were employed to obtain the calibration curve, using a mix of three sulfur compounds (ammonium sulfate, L-cysteine, and thiourea), and the linear range was from 0.033 μg to 4 μg S. The LOQ and the characteristic mass were 0.033 μg S and 0.011 μg S, respectively, while the accuracy was evaluated using different organic and inorganic reference materials, and good agreement (higher than 93%) with the certified values for S was observed.

Graphical abstract: The use of Ca + Pd + Zr as modifiers in the determination of sulfur by HR-CS GF MAS with solid sampling

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Publication details

The article was received on 19 Dec 2018, accepted on 08 Jan 2019 and first published on 09 Jan 2019


Article type: Paper
DOI: 10.1039/C8JA00445E
Citation: J. Anal. At. Spectrom., 2019, Advance Article
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    The use of Ca + Pd + Zr as modifiers in the determination of sulfur by HR-CS GF MAS with solid sampling

    A. A. Vieira, É. R. Pereira, E. Carasek and B. Welz, J. Anal. At. Spectrom., 2019, Advance Article , DOI: 10.1039/C8JA00445E

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