Sequential-injection procedure for determination of iodide in pharmaceutical and drinking water samples by catalytic reaction with spectrophotometric detection.
A novel sequential-injection system was developed for determination of iodide at very low concentrations by using a kinetic method. The method is based on the catalytic effect of iodide on the redox reaction between Ce4+ and As3+ first described by Sandell and Kolthoff. The calibration curve is constructed by measuring the decrease of Ce4+ absorbance versus iodide concentration with a delay time of 30 s. The detection limit is 1.5 microg/L, the working temperature is 45 degrees C, and the working range is 0.002-0.5 mg/L. Reasonable agreement was obtained when the method was applied to pharmaceutical and drinking water samples. The method has a sample throughput of approximately 15/h.
Erustes
J A
JA
University of the Balearic Islands, Departament de Química, Palma de Mallorca, Spain.
Forteza
R
R
Cerdà
V
V
D001151:Arsenic / Q000032:analysis; D002138:Calibration; D002384:Catalysis; D002563:Cerium / Q000032:analysis; D007202:Indicators and Reagents; D007454:Iodides / Q000032:analysis*; D004364:Pharmaceutical Preparations / Q000032:analysis*; D012996:Solutions; D013056:Spectrophotometry, Ultraviolet; D013696:Temperature; D014881:Water Supply / Q000032:analysis*
D007202:Indicators and Reagents; D007454:Iodides; D004364:Pharmaceutical Preparations; D012996:Solutions; D002563:Cerium; D001151:Arsenic