### Determination of Trace Amounts of Thallium by Adsorptive Cathodic Stripping Voltammetry with Xylenol OrangeDetermination of Trace Amounts of Thallium by Adsorptive Cathodic Stripping Voltammetry with Xylenol Orange

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 Author Shams, Esmaeil ♦ Yekehtaz, Mehdi Source J-STAGE Content type Text Publisher The Japan Society for Analytical Chemistry Language English
 Abstract Trace amounts of thallium(I) can be determined using adsorptive cathodic stripping voltammetry in the presence of Xylenol Orange (XO). The reduction current of the thallium(I)-XO complex ion was measured by square-wave cathodic stripping voltammetry. The peak potential was at -0.44 V vs. Ag/AgCl. The effect of various parameters (pH, ligand concentration, accumulation potential and collection time) on the response are discussed. The response was linearly related to the thallium concentration in the range 0.5 - 110 ng $ml^{-1}$ and 110 - 2000 ng $ml^{-1}.$ The limit of detection was 0.2 ng $ml^{-1}.$ The relative standard deviation for the determination of 80 ng $ml^{-1}$ thallium was 2.8%. Many common anions and cations did not interfere with the determination of thallium. The interference of lead was reduced by the addition of 0.003 M sodium carbonate. The voltammetric procedure was then successfully applied to the determination of thallium in various complex samples. ISSN 09106340 Learning Resource Type Article Publisher Date 2002-01-01 e-ISSN 13482246 Journal Analytical Sciences(analsci) Volume Number 18 Issue Number 9 Page Count 4 Starting Page 993 Ending Page 996