Abstract
Abstract Manganese speciation in natural waters and sediments has been investigated. Size distribution studies coupled with differential pulse polarography (DPP) showed that manganese in water is present either as Mn2+ aq or as a labile Mn(II) complex. The speciation of manganese in the sediments were done by sequential extraction. The exchangeable fraction showed the same pattern at the cross section of the river as for dissolved manganese and total organic carbon (TOC) indicating that all these have a common origin, i.e. anthropogenic input.
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