Determination of iodide in seawater using C30 column modified with polyoxyethylene oleyl ether in ion chromatography

• Published in: Talanta (Oxford) Vol. 72; no. 5; pp. 1625 - 1629
• Main Authors: Rong, Li, Lim, Lee Wah, Takeuchi, Toyohide
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 31.07.2007; Oxford Elsevier
• Subjects: Analytical chemistry; C30 modified stationary phase; Chemistry; Chromatographic methods and physical methods associated with chromatography; Exact sciences and technology; Iodide; Ion chromatography; Marine; Other chromatographic methods; Polyoxyethylene oleyl ether stationary phase; Seawater; Iodide; Ion chromatography; Polyoxyethylene oleyl ether stationary phase; C30 modified stationary phase; Seawater; Iodates; Peak resolution; Composition effect; Nitrates; Magnesium Chlorides; Retention time; Ammonium chloride; Direct method; Detection limit; Sodium sulfate; Thiocyanates; Standard deviation; Quantitative analysis; Stationary phase; Lithium Sulfates; Elution; Ether; Iodides; Sodium chloride; Ammonium sulfate; Inorganic anion; Ultraviolet detector; Cations; Aqueous solution; Magnesium Sulfates; Packed column
• ISSN: 0039-9140; 1873-3573
• DOI: 10.1016/j.talanta.2007.03.017

An ion chromatographic method for rapid and direct determination of iodide in seawater samples is reported. Separation was achieved using a laboratory-made C30 packed column (100 mm × 0.32 mm i.d.) modified with polyoxyethylene oleyl ether, with an aqueous solution of 300 mM sodium chloride as eluent and using UV detection at 220 nm. Samples containing iodate, nitrate, iodide and thiocyanate were eluted within 8 min, and the relative standard deviations of the retention time, peak area and peak height were all smaller than 4.19% for all of the analyte anions. Effects of eluent composition on retention behavior of inorganic anions have been investigated. Both cation and anion of the eluent affected the retention time of analytes. When inorganic eluents, such as ammonium chloride, ammonium sulfate, lithium chloride, sodium chloride, sodium sulfate, magnesium chloride and magnesium sulfate were used, the retention time of analytes increased with increasing eluent concentration. The limit of detection of iodide was 19 μg l −1 (S/N = 3), while the limit of quantitation was 66 μg l −1 (S/N = 10). The present method was successfully applied to the rapid and direct determination of iodide in seawater samples.