Dual-Wavelength Spectrophotometric Determination of Trace Amounts of Iron in Water and Food Usintg Copper-o-Chlorophenylfluorone Complex as Chromogenic Reagent

摘要

The reaction between iron (Fe~(3+)) and the chromogenic reagent, o-chlorophenylfluorone (o-CPF) was sensitive and selective at pH 6 and in the presence of excess of copper(II). It was used for the determination of trace amounts of iron by primary-secondary wavelength spectrophotometery (PSWS). This method gave higher sensitivity than ordinary spectrohotometery because it can utilize simultaneously the peak absorption and the valley absorption of the complex solution. By analyzing several samples, the relative standard deviations were less than 3.8% and the recovery rate of Fe between 92.5 and 108%.