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The derivatization of molecular iodine to iodoform and its determination by adsorptive stripping voltammetry
Author(s) -
Möller Ada,
Scholz Fritz,
Lovrić Milivoj
Publication year - 1995
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.1140071014
Subject(s) - iodoform , adsorptive stripping voltammetry , detection limit , chemistry , iodine , derivatization , stripping (fiber) , extraction (chemistry) , calibration curve , aqueous solution , anodic stripping voltammetry , voltammetry , chromatography , analytical chemistry (journal) , materials science , high performance liquid chromatography , electrode , electrochemistry , organic chemistry , composite material
The determination of elementary iodine in aqueous solutions is possible by a preliminary liquid–liquid extraction into benzene, followed by a derivatization to iodoform with alcoholic KOH solution. The iodoform is measured by adsorptive stripping voltammetry at a signal which corresponds to the reaction\documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm HCl}_{\rm 3} + {\rm H}^ + + 2{\rm e}^ - \mathbin{\lower.3ex\hbox{$\buildrel\textstyle\rightarrow\over {\smash{\leftarrow}\vphantom{_{\vbox to.5ex{\vss}}}}$}} {\rm H}_{\rm 2} {\rm Cl}_{\rm 2} + {\rm I}^ - $$\end{document} The calibration plot is linear up to 1 × 10 −5 mol/L. The detection limit is at least 2 × 10 −8 mol/L and the standard deviation of the entire analytical procedure is 10%. The procedure is applicable to seawater.