Determination of dissolved sulphides in waste water samples by flow-through stripping chronopotentiometry with a macroporous mercury-film electrode.
Sulphides in water samples were determined by stripping chronopotentiometry in a computer controlled flow system with a flow-through electrochemical cell. The working electrode was a porous glassy carbon electrode coated with Nafion and mercury. The sample was diluted with 0.1 mol L(-1) NaOH and analysed. Sulphides in the sample were collected in the porous electrode as mercury sulphide and then stripped by a current of -500 microA. The limit of detection was found to be 1.6 microg L(-1) and 0.5 microg L(-1) for 1 mL and 5 mL of preconcentrated sample, respectively. The linear range for 1mL sample was found to be 5-400 microg L(-1). The repeatability and reproducibility was found to be 2.6% and 4.8%, respectively. The method was applied to analyses of waste water samples from a tannery.
Manova
A
A
Slovak University of Technology, Institute of Analytical Chemistry, Radlinskeho 9, 812 37 Bratislava, Slovakia.
Strelec
M
M
Cacho
F
F
Lehotay
J
J
Beinrohr
E
E
D002244:Carbon; D002623:Chemistry Techniques, Analytical / Q000379:methods*; D004563:Electrochemistry / Q000379:methods; D004566:Electrodes; D007220:Industrial Waste; D008628:Mercury / Q000032:analysis*; D011199:Potentiometry; D015203:Reproducibility of Results; D013440:Sulfides / Q000032:analysis* / Q000737:chemistry; D014865:Waste Disposal, Fluid / Q000379:methods*; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis*
D007220:Industrial Waste; D013440:Sulfides; D014874:Water Pollutants, Chemical; D014867:Water; D002244:Carbon; D008628:Mercury