Determination of manganese in natural water and effluent streams using a solid-phase lead(IV) dioxide reactor in a flow-injection system

The determination of manganese(II) in natural water and effluent streams, using a solid-phase reactor incorporated into a flow-injection system, was investigated. Mn2+-ions in samples injected into a carrier stream, were oxidised by solid lead(IV) dioxide suspended on silica gel beads to form MnO4−-ions which were detected spectrophotometrically at 526 nm. The linear range of the system is between 1 to 5 mg l−1 with a detection limit of 0.56 mg l−1. The proposed system is suitable for the determination of manganese(II) in natural water and effluent streams with a relative standard deviation of better than 1.8%.