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A new automated spectrophotometric method for the determination of total sulfite in white and red wines is reported. The assay is based on the reaction of o-phthalaldehyde (OPA) and ammonium chloride with the analyte in basic medium under SI conditions. Upon on-line alkalization with NaOH, a blue product is formed having an absorption maximum at 630nm. The parameters affecting the reaction – temperature,...
A sensitive and robust analytical method for spectrophotometric determination of ethyl xanthate, CH 3 CH 2 OCS 2− at trace concentrations in pulp solutions from froth flotation process is proposed. The analytical method is based on the decomposition of ethyl xanthate, EtX − , with 2.0molL −1 HCl generating ethanol and carbon disulfide, CS 2 . A...
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