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Determination of total iodide in seawater by gas chromatography-mass spectrometry  

Shin, Ueon-Sang (Korea Institute of Science and Technology)
Publication Information
Analytical Science and Technology / v.15, no.5, 2002 , pp. 445-450 More about this Journal
Abstract
A sensitive gas chromatographic method has been established for the determination of total iodide in seawater as their volatile organic derivative. The method is based on the formation of 4-iodo-2,6-dimethylphenol with 2,6-dimethylphenol in matrix and a single-step extraction of the derivative with ethyl ether, which are then measured by gas chromatography-mass spectrometry (selected ion monitoring). Iodate in sea water was completely reduced to iodide with ascorbic acid and acetic acid. The detection limit was 0.1 ng/mL in seawater and the calibration curve showed good linearity with r=0.9997. The method was sensitive, reproducible and simple enough to permit the reliable routine analysis of total iodide in seawater. Total iodide in sea water was found about 30 ng/ml.
Keywords
Seawater; iodide; GC-MS; 4-iodo-2,6-dimethylphenol;
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