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 and potentiometric monitoring of the sulphide in a laboratory-made module has been developed. The analyte was converted into hydrogen sulphide by reaction with an acidic donor stream and accepted into a dilute NaOH solution after pervaporation. The method proposed has a determination range between 0.1-30µgml-1 and 0.3-50µgg-1 for liquid and solid samples, respectively, a precision (expressed as relative standard deviation) of 3.1 and 4.3%, respectively, and has been applied to a sulphide quality control standard containing a certified concentration of 10.10 µgml-1 with excellent results.