Single Sweep Polarographic Determination of Nitrite by Conversion to Formamidine Disulfide

A sensitive single sweep polarographic peak, related to the nitrite concentration, appears in a slightly acidic solution containing nitrite and thiourea. The peak is ascribed to the reduction of formamidine disulfide (RSSR) resulting from the reaction between nitrite and thiourea. The reduction proc...

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Bibliographic Details
Published inAnalytical Sciences Vol. 7; no. 1; pp. 109 - 113
Main Authors CAI, Xiaohua, PEI, Jianhong, ZHOU, Xingyao, ZHAO, Zaofan
Format Journal Article
LanguageEnglish
Published Tokyo The Japan Society for Analytical Chemistry 1991
Japan Society for Analytical Chemistry
Japan Science and Technology Agency
Subjects
Analytical chemistry
Chemistry
Electrochemical methods
Exact sciences and technology
formamidine disulfide
nitrite
Single sweep polarography
Trace analysis
Cyclic voltammetry
Pulse polarography
Chemical analysis
Nitrites
Ultraviolet visible spectrometry
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Summary:A sensitive single sweep polarographic peak, related to the nitrite concentration, appears in a slightly acidic solution containing nitrite and thiourea. The peak is ascribed to the reduction of formamidine disulfide (RSSR) resulting from the reaction between nitrite and thiourea. The reduction process involves a slow conversion of this disulfide to mercury sulfide, i.e.a preceding reaction mechanism. The method is used to determine trace concentrations of nitrite, with a detection limit of 5×10-7mol/dm3. The sensitivity increases ten times when catholic stripping voltammetry is used at the static mercury electrode.
ISSN:0910-6340
1348-2246
DOI:10.2116/analsci.7.109