Anodic stripping potentiometric determination of antimony in environmental materials

✍ Scribed by S.B. Adeloju; T.M. Young

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 628 KB
• Volume: 302
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(94)00452-r

✦ Synopsis

A method is described for sensitive and reliable determination of ultra-trace concentrations of antimony in environmental samples by anodic stripping potentiometry (ASP). The method involves potentiostatic deposition of antimony onto a glassy carbon mercury film electrode and the subsequent chemical oxidation (stripping) with mercury(H) ions. The optimum conditions for the reliable determination of antimony by this method are mixture of 1 M HCl and 0.5 M NaCl as supporting electrolyte, electrolysis potential of -400 mV vs. saturated calomel electrode (WE) and 8 mg/l of mercury(H) ions as oxidant. A linear concentration range is obtained from O-250 pg/l and the detection limit with a lo-min electrolysis time is 0.9 pg/l(3% R.S.D., n = 6). The interferences of inorganic and organic substances such as lead, copper, cadmium, sodium dodecyl sulphate and Triton X-100 were overcome by selective deposition of the analyte and by the use of standard additions method. The use of a dry ashing procedure in conjunction with the' anodic stripping potentiometric technique for the reliable determination of ultra-trace concentrations of antimony in environmental materials is demonstrated.