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Adsorptive Stripping Determination of Scandium(III) with Mordant Blue 9 on Silver Amalgam Film Electrode
Author(s) -
Piech Robert
Publication year - 2010
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201000176
Subject(s) - scandium , detection limit , certified reference materials , calibration curve , chemistry , adsorption , stripping (fiber) , dithiocarbamate , analytical chemistry (journal) , mercury (programming language) , materials science , chromatography , inorganic chemistry , organic chemistry , computer science , programming language , composite material
Abstract A new adsorptive stripping voltammetric method for the determination of trace scandium(III) based on the adsorption of scandium(III)‐mordant blue 9 complex on the cyclic renewable mercury film silver based electrode (Hg(Ag)FE) is presented. The effects of various factors such as: preconcentration potential and time, pulse height, step potential and supporting electrolyte composition are optimized. The calibration graph is linear from 2 nM (0.09 μg L −1 ) to 90 nM (4 μg L −1 ) for a preconcentration time of 45 s, with correlation coefficient of 0.9995. For a Hg(Ag)FE with a surface area of 7.9 mm 2 the detection limit for a preconcentration time of 90 s is as low as 5 ng L −1 . The repeatability of the method at a concentration level of the analyte as low as 0.2 μg L −1 , expressed as RSD is 1.9 % ( n =5). The proposed method was successfully applied and validated by studying the certified reference material (CRM 320 – river sediment) and natural samples with simultaneous recovery of Sc(III) from spiked water and sediment samples.