Rong Li, Takeuchi Toyohide
Department of Chemistry, Faculty of Engineering, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan.
J Chromatogr A. 2004 Jul 9;1042(1-2):131-5. doi: 10.1016/j.chroma.2004.05.032.
An ion chromatography method for rapid and direct determination of iodide in seawater and edible salt is reported. Separation was achieved using a laboratory-made C30 packed column (100 mm x 0.32 mm i.d.) modified with poly(ethylene glycol) (PEG). Effects of eluent composition on retention behavior of inorganic anions have been investigated. Both cation and anion of the eluent affected the retention of analyte anions. The retention time of anions increased with increasing eluent concentration when lithium chloride, sodium chloride, potassium chloride, sodium sulfate, magnesium sulfate were used as the eluent, while it decreased with increasing eluent concentration when ammonium sulfate was used as the eluent. The detection limit for iodide obtained by injecting 0.2 microl of sample was 9 microg/l (S/N = 3). The present method was successfully applied to the rapid and direct determination of iodide in seawater and edible salt samples. Partition may be involved in the present separation mode.
报道了一种用于快速直接测定海水和食用盐中碘化物的离子色谱法。使用用聚乙二醇（PEG）改性的自制C30填充柱（100 mm×0.32 mm内径）实现分离。研究了洗脱液组成对无机阴离子保留行为的影响。洗脱液的阳离子和阴离子都影响分析物阴离子的保留。当使用氯化锂、氯化钠、氯化钾、硫酸钠、硫酸镁作为洗脱液时，阴离子的保留时间随洗脱液浓度的增加而增加，而当使用硫酸铵作为洗脱液时，阴离子的保留时间随洗脱液浓度的增加而减少。进样0.2微升样品得到的碘化物检测限为9微克/升（信噪比=3）。本方法成功应用于海水和食用盐样品中碘化物的快速直接测定。本分离模式可能涉及分配过程。
