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Novel Sensitive Voltammetric Detection of Trace Gallium(III) with Presence of Catechol Using Mercury Film Silver Based Electrode
Author(s) -
Piech Robert
Publication year - 2009
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.200904621
Subject(s) - detection limit , gallium , mercury (programming language) , calibration curve , chemistry , supporting electrolyte , catechol , repeatability , electrode , adsorption , analyte , analytical chemistry (journal) , electrolyte , materials science , chromatography , organic chemistry , computer science , programming language
A new adsorptive stripping voltammetric method for the determination of trace gallium(III) based on the adsorption of gallium(III)‐catechol 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 (0.14 μg L −1 ) to 100 nM (6.97 μg L −1 ) for a preconcentration time of 30 s, with correlation coefficient of 0.9993. For a Hg(Ag)FE with a surface area of 9.7 mm 2 the detection limit for a preconcentration time of 90 s is as low as 7 ng L −1 . The repeatability of the method at a concentration level of the analyte as low as 0.05 μg L −1 , expressed as RSD is 3.6% ( n =5). The proposed method was successfully applied by studying the natural samples and simultaneous recovery of Ga(III) from spiked water and sediment samples.