Determination of iodide in seawater and edible salt by microcolumn liquid chromatography with poly(ethylene glycol) stationary phase.
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.
Rong
Li
L
Department of Chemistry, Faculty of Engineering, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan.
Takeuchi
Toyohide
T
D000097:Acetonitriles; D002853:Chromatography, Liquid; D007202:Indicators and Reagents; D007454:Iodides / Q000032:analysis*; D008970:Molecular Weight; D011092:Polyethylene Glycols; D012623:Seawater / Q000032:analysis*; D017673:Sodium Chloride, Dietary / Q000032:analysis*; D012997:Solvents; D013056:Spectrophotometry, Ultraviolet
D000097:Acetonitriles; D007202:Indicators and Reagents; D007454:Iodides; D017673:Sodium Chloride, Dietary; D012997:Solvents; D011092:Polyethylene Glycols