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Abstract
The optimum conditions for extraction of manganese (VII) as an ion-association complex with Tetrazolium Violet (TV) has been determined. The ratio MnO4 −: TV+ is 1:1. Beer's law is obeyed in the range of 0.05 - 0.6 μg ml−1 manganese (VII). The molar absorptivity of the ion-pair is (6.67 ± 0.05) × 104 L mol−1cm−1, extraction constant Kex = 3.1 × 104, distribution constant KD = 56.5 and association constant β = 5.59 × 102. A sensitive and selective method for determination of microquantities of manganese (VII) in soils has been developed.