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A method to determine Fe(Ⅲ) by thin layer resin phase spectrophotometry has been developed in this paper. The colored complex formed by Fe(Ⅲ) and 1,2-benzendiol is concentrated on the 717# resin, then Fe(Ⅲ) can be determined directly by making thin layer. The method is sensitive with a apparent molar absorption of 4.8×104L/mol·cm, which is 16 times higher than that of liquid phase spectrophotometry, most coexisting ions do not influence the determination. The detection limit for Fe(Ⅲ) is 1.47μg/L with the precision of 3.3% [n=6, 7μg/50mL Fe(Ⅲ)]. The calibration curve is linear in the range of 0~25μg/50mL. The preposed method was applied to the determination of Fe(Ⅲ) in water sample with satisfactory results.
The colored complex formed by Fe (Ⅲ) and 1,2-benzendiol is concentrated on the 717 # resin, then Fe (Ⅲ) can be determined directly by making thin layer. The method is sensitive with an apparent molar absorption of 4.8 × 104 L / mol · cm, which is 16 times higher than that of liquid phase spectrophotometry, most coexisting ions do not influence the determination. The detection limit The calibration curve is linear in the range of 0 ~ 25 μg / 50 mL. The preposed method was applied with Fe (Ⅲ) of 1.47 μg / L with the precision of 3.3% [n = 6, 7 μg / to the determination of Fe (Ⅲ) in water sample with satisfactory results.