Rong Li, Lim Lee Wah, Takeuchi Toyohide
Department of Chemistry, Faculty of Engineering, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan.
Talanta. 2007 Jul 31;72(5):1625-9. doi: 10.1016/j.talanta.2007.03.017. Epub 2007 Mar 19.
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 x 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 microg l(-1) (S/N=3), while the limit of quantitation was 66 microg l(-1) (S/N=10). The present method was successfully applied to the rapid and direct determination of iodide in seawater samples.
报道了一种用于快速直接测定海水样品中碘化物的离子色谱方法。采用实验室自制的填充有聚氧乙烯油醚的C30柱（100 mm×0.32 mm内径）进行分离，以300 mM氯化钠水溶液为洗脱剂，在220 nm处进行紫外检测。含有碘酸盐、硝酸盐、碘化物和硫氰酸盐的样品在8分钟内洗脱完毕，所有分析物阴离子的保留时间、峰面积和峰高的相对标准偏差均小于4.19%。研究了洗脱剂组成对无机阴离子保留行为的影响。洗脱剂的阳离子和阴离子均影响分析物的保留时间。当使用氯化铵、硫酸铵、氯化锂、氯化钠、硫酸钠、氯化镁和硫酸镁等无机洗脱剂时，分析物的保留时间随洗脱剂浓度的增加而增加。碘化物的检测限为19 μg l(-1)（S/N = 3），定量限为66 μg l(-1)（S/N = 10）。该方法成功应用于海水样品中碘化物的快速直接测定。
