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 strea ms, using a solid-phase reactor incorporated into a flow-injection sys tem, was investigated. Mn2+-ions in samples injected into a earner str eam, were oxidised by solid lead(IV) dioxide suspended on silica gel b eads to form MnO4--ions which were detected spectrophotometrically at 526 nm. The linear range of the system is between I to 5 mg l(-1) with a detection limit of 0.56 mg l(-1). The proposed system is suitable f or the determination of manganese(II) in natural water and effluent st reams with a relative standard deviation of better than 1.8%.