Determination of sulphide in liquid and solid samples by integrated pervaporation-potentiometric detection

A selective dynamic method for the determination of sulphide in Liquid and solid samples based on the integration of hydrogen sulphide pervaporation a nd potentiometric monitoring of the sulphide in a laboratory-made module ha s been developed. The analyte was converted into hydrogen sulphide by react ion with an acidic donor stream and accepted into a dilute NaOH solution af ter pervaporation. The method proposed has a determination range between 0. 1-30 mug ml(-1) and 0.3-50 mug g(-1) for liquid and solid samples, respecti vely, a precision (expressed as relative standard deviation) of 3.1 and 4.3 %, respectively, and has been applied to a sulphide quality control standar d containing a certified concentration of 10.10 mug ml(-1) with excellent r esults. (C) 2001 Elsevier Science B.V. All rights reserved.