Abstract
ABSTRACT The catalytic effect of manganese (II) on the oxidation of Diphenylamine-4-azo-benzen-4'-sulfonic acid potassium salt with potassium periodate in the presence of 1, 10-phenanthroline in weakly acidic media was studied. A catalytic kinetic spectrophotometric method for determination of manganese (II) in the range 0.05 – 2.5 ng ml-−1 can be determined by the fixed-time method with a detection limit of 0.017 ng ml-−1. The method was applied successfully to the determination of manganese (II) in tap water and human urine.
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