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Determination of Aluminum by Adsorptive Cathodic Stripping Voltammetry with 1,2‐Dihydroxyanthraquinone‐3‐Sulfonic Acid (DASA): Effect of Thin Mercury Film Electrode
Author(s) -
Thomas Shaun D.,
Davey David E.,
Mulcahy Dennis E.,
Chow Christopher W. K.
Publication year - 2006
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.200503629
Subject(s) - mercury (programming language) , chemistry , cathodic stripping voltammetry , hanging mercury drop electrode , detection limit , masking agent , electrode , voltammetry , anodic stripping voltammetry , inorganic chemistry , analytical chemistry (journal) , nuclear chemistry , electrochemistry , chromatography , computer science , programming language
An analytical technique for aluminum (Al) based upon the complexation reaction between Al and the ligand – DASA (1,2‐dihydroxy‐anthraquinone‐3‐sulfonic acid) has previously been implemented successfully at the hanging mercury drop electrode (HMDE). There are several advantages of using mercury film electrodes (TMFE) over the HMDE, particularly if disposal of mercury is of concern. The novelty of using TMFE for adsorptive cathodic stripping voltammetry (ACSV) of Al – DASA is demonstrated in this paper. The peak potential used for the detection of Al in this system was at −1.15 V (vs. Ag/AgCl). The method produced a limit of detection ( LOD ) of 1 μM ( n =5) and a linear working range of 1–20 μM Al. Atomic force microscopy methods were used to investigate the nature of the TMFE and its interaction with DASA. The mercury droplets on the TMFE have a limited volume and this may lead to overloading of the electrode at relatively low concentrations of DASA. Interferences from Fe, Ca, Zn and Mg were investigated with only Fe appearing to interfere with the Al‐DASA system. Two masking agents ( o ‐phenanthroline and 2,2′‐bipyridyl) were shown to be effective at preventing the Fe interference.