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Electrochemical Detection of ClO $\rm{ {_{3}^{-}}}$ , BrO $\rm{ {_{3}^{-}}}$ , and IO $\rm{ {_{3}^{-}}}$ at a Phosphomolybdic Acid Linked 3‐Aminopropyl‐Trimethoxysilane Modified Electrode
Author(s) -
Rahman Md. Aminur,
Won MiSook,
Wei PeiHai,
Shim YoonBo
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.200603489
Subject(s) - electrode , electrochemistry , chemistry , x ray photoelectron spectroscopy , phosphomolybdic acid , cyclic voltammetry , redox , analytical chemistry (journal) , nuclear chemistry , inorganic chemistry , catalysis , physics , organic chemistry , nuclear magnetic resonance
A composite film modified electrode containing a Keggin‐type heteropolyanion, H 3 (PMo 12 O 40 )⋅H 2 O, was fabricated with 3‐aminopropyltrimethoxysilane (APMS) attached on an electrochemically activated glassy carbon (GC) electrode through the formation of COSi bond. PMo 12 O $\rm{ {_{40}^{3-}}}$ was then complexed with APMS through the electrostatic interaction between the phosphate groups of PMo 12 O $\rm{ {_{40}^{3-}}}$ and amine groups of APMS (PMo 12 O $\rm{ {_{40}^{3-}}}$ ‐APMS). XPS and cyclic voltammetry were employed for characterization of the composite film. The PMo 12 O $\rm{ {_{40}^{3-}}}$ ‐APMS modified electrode showed three reversible redox pairs with smaller peak‐separation and was stable in the larger pH range compared with that in a solution phase. The catalytic properties of the modified electrode for the reduction of ClO $\rm{ {_{3}^{-}}}$ , BrO $\rm{ {_{3}^{-}}}$ , and IO $\rm{ {_{3}^{-}}}$ were studied and the modified electrode exhibited good electrocatalytic activities for the three anions. The experimental parameters, such as pH, temperature, and the applied potential were optimized. The detection limits were determined to be 7.0±0.35 μM, 4.0±0.17 μM, and 0.1±0.04 μM for ClO $\rm{ {_{3}^{-}}}$ , BrO $\rm{ {_{3}^{-}}}$ , and IO $\rm{ {_{3}^{-}}}$ , respectively. The modified electrode was applied to natural water samples for the detection of ClO $\rm{ {_{3}^{-}}}$ , BrO $\rm{ {_{3}^{-}}}$ , and IO $\rm{ {_{3}^{-}}}$ .