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Design of a new flame-containing molecular emission cavity for speciation of sulfide, sulfite, sulfate, thiosulfate and thiocyanate in wastewater: catalytic behaviour of hydrogen ion

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A new flame-containing molecular emission cavity analysis (MECA) system was designed for the speciation of S2−, SO3 2−, SO4 2−, SCN, and S2O3 2− in wastewater based on the catalytic properties of H+. For speciation of sulfur, SO3 2− and S2O3 2− were detected via the formation of SO2 during direct introduction to an air-bubbling Cu(II)/HNO3 and Al(III)/OH solutions, respectively. Total quantity of SO3 2−, S2−, SO4 2−, and SCN was also determined via introduction of the real sample to the other vessel containing Ar-bubbling HClO4 (0.5 M) via generation of SO2 as well as aerosols of H2S, H2SO4, and HSCN using a sonicator. For determination of sulfate, S2−, SO3 2−, and SCN were masked using a 0.01-mol L−1 Ag(I), followed by introduction of the filtered solution through the injection port. SCN was also detected by oxidation with I3 (0.5 mmol L−1) during evaluation of the enhancement in the molecular emission of generated SO4 2 . In addition, S2− was evaluated via difference between the molecular emissions of sulfur compounds. No molecular emission was also observed for S4O6 2−. The only observed interference was evaluated during the introduction of 500-fold excess of PO4 3−.
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Keywords: chemiluminescence; molecular emission cavity analysis; speciation; sulfur compounds

Document Type: Research Article

Affiliations: Department of Chemistry, College of Sciences, Shiraz University, Shiraz, 71454, Iran

Publication date: September 26, 2014

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