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The color of the water-soluble amethyst complex formed by the reaction of ferric ions with 2-fluorobenzoic acid can be used as the basis of a spectrophotometric method for the determination of iron. The effect of pH, concentration of reagents, and the presence of diverse ions are discussed. Results similar to those obtained by the salicylic acid method for the determination of iron can be expected, with the advantage that only the ferric ion reacts.

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