Radioiodination of humic substances via azocoupling with 3-[125I] iodoaniline.

Radioiodination of humic substances via azocoupling with 3-[125I] iodoaniline. Research Abstract Details 

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Radioiodination of humic substances via azocoupling with 3-[125I] iodoaniline. Abstract Text:

A new method is described for radiolabeling humic substances (HS) with iodine radioisotopes. The method radiolabels the electron-rich aromatic moieties of HS with the 3-[125I]iodobenzenediazonium ion via azocoupling. The method uses four steps: (i) 3-aminobenzenetrimethylstannane is synthesized and isolated by using a silica gel column, (ii) 3-[125I]iodoaniline is synthesized and isolated by HPLC, with radiochemical yields of up to 60%, (iii) 3-[125I]iodobenzenediazonium chloride is synthesized, and the reaction mixture from this step is used in step iv to radioiodinate HS with radiochemical yields of up to 95% (with reference to 3-[125I]iodoaniline). The advantage of this method is that it is selective radiolabeling, placing the radiolabel in a specific site (the 3-position of the phenyl ring) within HS molecules, which minimizes unwanted secondary chemical interactions. Investigations of the stability of the radiolabel and the effect of photoreductive dehalogenation showed that there was a negligible release of 125I. The production of radiolabeled HS using this method allows the sensitive detection of HS in laboratory and field studies. In addition, the method offers the possibility of using different iodine radioisotopes simultaneously in investigations using HS.

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Radioiodination of humic substances via azocoupling with 3-[125I] iodoaniline. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Environmental science & technology

VOLUME: 42

Page Numbers: 4083-7

Journal Abbreviation: Environ. Sci. Technol.

ISSN: 0013-936X

DAY: 1

MONTH: Jun

YEAR: 2008

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LANGUAGE: eng

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Grant and Affiliation Information for Radioiodination of humic substances via azocoupling with 3-[125I] iodoaniline.

AFFILIATION: Institute of Interdisciplinary Isotope Research, Permoserstrasse 15, 04318 Leipzig, Germany. franke@iif-leipzig.de

Country: United States

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MEDLINETA: Environ Sci Technol

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