Premium
Capillary electrophoretic separation of inorganic sulfur–sulfide, polysulfides, and sulfur‐oxygen species
Author(s) -
Petre Catalin Florin,
Larachi Faïçal
Publication year - 2006
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/jssc.200500265
Subject(s) - chemistry , thiosulfate , sulfur , tetrathionate , sulfite , polysulfide , sodium hydrosulfide , inorganic chemistry , sulfide , sulfate , hydrogen sulfide , organic chemistry , electrolyte , electrode
A CE protocol was developed for the identification and separation of inorganic polysulfides simultaneously with other inorganic sulfur‐bearing species coexisting in aqueous hydrosulfide/sulfur solutions. The electrophoretic separation of thiosulfate, sulfate, hydrosulfide, sulfite, tetrathionate, and polysulfides was achieved at pH values between 8.2 and 12.2. The peaks attributed to the polysulfide species were strongly sensitive to pH. CE analysis of hydrosulfide/sulfur solutions at different pH values permitted possible identification of two forms of polysulfides: S 4 2– and S 3 2– . Upon exposure to air at ambient temperature, thiosulfate was the main oxidation product of hydrosulfide/sulfur solutions mainly in the first 60 min, when hydrosulfide was rapidly consumed. Analysis of the oxidation reaction products provided retrospectively tentative evidence that the peaks separated and identified as tri‐ and tetrasulfide may be ascribed to polysulfides.