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A voltammetric phosphate sensor based on heteropolyanion formation at the nitrobenzene/water interface
Author(s) -
Osakai Toshiyuki,
Himeno Sadayuki,
Saito Atsuyoshi,
Katano Hajime
Publication year - 1993
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.1140050306
Subject(s) - arsenate , nitrobenzene , phosphate , aqueous solution , chemistry , ion , inorganic chemistry , electrochemistry , electrode , arsenic , catalysis , organic chemistry
A novel voltammetric sensor for phosphate ion has been developed. This sensor relies on electrochemical formation of a heteropolyanion at the interface between an aqueous sample solution and a nitrobenzene solution containing hexamolybdate anion (Mo 6 19 2− ) and on the subsequent detection of the voltammetric current due to the interfacial transfer of the heteropolyanion formed. Under optimal conditions, the voltammetric current is proportional to the phosphate concentration in the range from 0.02 to 0.5 mM. Though silicate ion interferes with the determination of phosphate ion, arsenate and germanate ions cause no significant interference.