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Solid Phase Spectrophotometric Determination Of Cobalt By Xylenol Orange

Jila Azad, Nahid Chalyavi, Kazem Kargosha

A simple and sensitive solid phase spectrophotometric method for the determination of cobalt is proposed based on the reaction between cobalt and xylenol orange (XO). The reaction product is fixed on the anionic exchanger resin sephadex QAE A-25 at pH= 5. The optical absorbance of the anionic gel like resin, packed in a 1.00 mm cell is directly measured at 588.0 nm. The linear range of calibration curve is found to be 100-1000 μgL-1, with a detection limit of 13 ppb. The relative standard deviation for ten independent determinations is 2.1%. The effect of foreign ions is also studied.