An indirect procedure for the determination of 2,4‐dichlorophenoxyacetic acid (2,4‐D) and 2,4,5‐trichlorophenoxyacetic acid (2,4,5‐T) in mixtures via adsorptive stripping voltammetry is reported. This method takes advantage of the formation of a new pH‐dependent peak, which is obtained when these acids interact with Fe(II). The limits of detection are 1.7 ppb for 2,4‐D and 1.5 ppb for 2,4,5‐T. The relative standard deviations (for 10 determinations) are 6.2 and 5.7%, respectively.
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Li et al. (1990) studied this question.
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