Abstract
Pollution of sulfur compounds could result in serious environmental issues, while the excessive intake tended to damage the respiratory and nervous system of living beings. In this article, a microplasma converter with small size, easy operation and low gas and power consumption was constructed to fulfill the high-efficient oxidation process of H2S to SO2, which was applied to both spectrophotometry and visual colorimetry to achieve a simple and quick nonchromatographic speciation analysis of H2S/SO2 or S2-/SO32-. Especially, analytes were introduced by acidified to vapor, greatly alleviating the matrices interferences, and visual colorimetry could attain direct naked eye detection without expensive instruments and tedious operation procedures. The lowest limit of detection was 3.47 μmol/L for both aqueous S2- and SO32- ions, and the integration of two methods covered a wide detection range of 0.05–7 mmol/L. These developed methods were applied to analysis of real environmental water samples successfully.
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