Abstract
Inorganic iodine species, iodide, and iodate in seawater have been determined by a variety of classical methods of analysis. Only the spectrophotometric procedure using the absorbance of I/sub 3//sup -/ at 353 nm is utilized for an automatic determination. This method, however, has a few disadvantages such as interference with nitrite and insufficient accuracy for low concentration of iodide. This paper describes a new electrochemical technique for the automatic determination of iodine species in natural waters. The iodide is electrochemically oxidized to iodine and quantitatively concentrated on a carbon wool electrode in a preconcentration cell. After the interference ions were removed, the iodine was eluted with reducing agent followed by the determination at the polished Ag/sub 3/SI electrode in the detection cell. The iodate is determined after being reduced to iodide by reducing agent. The resulting amperometric current is proportional to iodide or iodate concentration in the original solution. The sensitivity is 0.4-0.5 ..mu..A/..mu..g I/sup -/ and the detection limit is 5 ng of I/sup -/. Iodine species can be accurately determined as iodide and total iodine (iodide + iodate) from less than 50 mL of seawater sample by this method. 5 references, 7 figures, 1 table.
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