||I U P A C
Organizations & People
Pure Appl. Chem.,
Vol. 70, No. 8, pp.1567-1584, 1998
COMMISSION OF MICROCHEMICAL TECHNIQUES AND TRACE ANALYSIS
Working Group on Speciation
The Determination of Iodine Species in Environmental
and Biological Samples
and M. Morita
Synopsis: Iodine is found in organic forms in plants and animals and
in inorganic forms in natural water samples. Methods of identification and
quantitative determination for iodine species are decided by the types of
compound and the matrices in which they occur. Iodine is an essential element
and specific raioimmunoassay methods have been devised for physiologically
important compounds (thyroxine and related compounds) in which it is found.
In addition, marine plants and animals have provided a rich source of varied
and unexpected organic iodine compounds that occur, along with other organic
halogen compounds, as secondary metabolites. Natural waters, particularly
marine waters contain iodine chiefly in the forms of iodide and iodate. Organic
iodine compounds in biological samples have been identified by classical natural
products chemical techniques following their isolation, and by modern spectroscopic
methods. Routine analysis of such compounds can be done by gas chromatography
(GC) and high performance liquid chromatography (HPLC). Analysis of inorganic
iodine species in waters is carried out by catalytic, electrochemical and
spectrometric methods and by GC; possibly HPLC inductively coupled-mass spectrometry
(ICP-MS) might be the method of choice in the future.
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