Determination of lead in indium metal and indium salts by anodic stripping voltammetry with addition of surfactant to suppress the indium peak

✍ Scribed by J. Opydo

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 444 KB
• Volume: 262
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(92)80015-y

✦ Synopsis

The determmatlon of trace lead IO mdmm and mdrum salts by d c anodlc stnppmg voltammetry without prelmunary separation IS described The electrocheuucal actlvlty of mdmm, which usually Interferes m the determmatlon of lead, IS inhibited by using Sulforokanol L-3 (oxyethylated lauryl alcohol sodmm sulphate salt) as a surfactant In 0 5 M tartrate solution at pH 4 4 as a supportmg electrolyte unthout the surfactant present, trace levels of lead (1 x lo-' M) can be determmed accurately d the molar ratlo of mdmm to lead IS not higher than 3, but If the electrolyte also contams 0 1% Sulforokanol L-3, mdmm can be tolerated at concentrations up to 0 05 M and the height of the lead peak is unaffected It IS therefore possible to determine 1 X 10-s M PMII) m the presence of 0 05 M I&I), 1 e , lead at the 3 6 X lo-'% level m mdmm The accuracy and preaslon of the determmation are satisfactory (relative standard devlatlon 2 4-8 8%) Lead has been determined m mdmm metal and mdmm salts of vanous degrees of punty