HPLC-ICP-MS Determination of Iodate and Iodide in Drinking Water

A method of HPLC-ICP-MS for the determination of iodate and iodide in drinking water was proposed.Dionex IonPac AS14 anion chromagraphic column and AG14 guard column and 50 mmol·L-1 ammonium carbonate(adjusted to pH 9.9 with aq.ammonia) as mobile phase were used for separation of iodate and iodide.The eluates were used for ICP-MS determination,with linearity ranges between 0.20 to 300 μg·L-1 for both iodate and iodide.Values of detection limit(3S/N) found were 0.09 μg·L-1 for iodate and 0.13 μg·L-1 for iodide.Tests for recovery and precision were made by standard addition method at 2 different concentration levels,the results obtained were as follows: ① for iodate,recovery: 100.5% to 113.0%,RSD′s(n=8): 1.2% to 2.8%;② for iodide,recovery: 101.9% to 110.7%,RSD′s(n=8): 1.3% to 2.0%.