Determination of manganese(VII) as 3,3′-Dianisole-4,4′-bis(3,5-diphenyltetrazolium chloride) complex and its application

Abstract

A simple, rapid, selective and sensitive spectrophotometric method is described for the determination of trace amounts of manganese using Blue tetrazolium chloride as a chromogenic reagent. The method is based on the formation of ion-associate complex between manganese(VII) and the cation of ditetrazolium salt, having an absorption maximum at 255 nm. Beer’s law is obeyed in the range of 0.1–1.6 μg mL−1. The molar absorptivity and Sandell’s sensitivity were found to be 4.97 × 104 L mol−1 cm−1 and 1.11 × 10−3 μg cm−2, respectively. Limit of deterction is 6.86 ng mL−1 Mn(VII) and limit of quantitation is 22.8 ng mL−1 Mn(VII). Optimum reaction conditions were evaluated. The effect of interfering ions on the determination is described. The extraction, distribution and association constants, and the recovery factor have been calculated.