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Electrocatalytic Reduction and Determination of Iodate and Periodate at Silicomolybdate‐Incorporated‐Glutaraldehyde‐ Cross‐Linked Poly‐ L ‐lysine Film Electrodes
Author(s) -
Pan YuChing,
Thangamuthu R.,
Chen ShenMing
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.200900526
Subject(s) - iodate , amperometry , periodate , glutaraldehyde , electrode , electrocatalyst , chemistry , materials science , inorganic chemistry , electrochemistry , iodide , chromatography , organic chemistry
The present work describes reduction of iodate (IO 3 − ), and periodate (IO 4 − ) at silicomolybdate‐doped‐glutaraldehyde‐cross‐linked poly‐ L ‐lysine (PLL‐GA‐SiMo) film coated glassy carbon electrode in 0.1 M H 2 SO 4 . In our previous study, we were able to prepare the PLL‐GA‐SiMo film modified electrode by means of electrostatically trapping SiMo 12 O 40 4− mediator in the cationic film of PLL‐GA, and the voltammetric investigation in pure supporting indicated that the charge transport through the film was fast. Here, the electrocatalytic activity of PLL‐GA‐SiMo film electrode towards iodate and periodate was tested and subsequently used for analytical determination of these analytes by amperometry. The two electron reduced species of SiMo 12 O 40 4− anion was responsible for the electrocatalytic reduction of IO 3 − at PLL‐GA‐SiMo film electrode while two and six electron reduced species were showed electrocatalytic activity towards IO 4 − reduction. Under optimized experimental conditions of amperometry, the linear concentration range and sensitivity are 2.5×10 −6 to 1.1×10 −2 M and 18.47 μA mM −1 for iodate, and 5×10 −6 to 1.43×10 −4 M and 1014.7 μA mM −1 for periodate, respectively.