Mathematics – Logic
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gecoa..48.2107l&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 48, Issue 10, pp.2107-2111
Mathematics
Logic
3
Scientific paper
The speciation of Mn has been determined in 15 rivers and streams representing a wide variety of physico-chemical conditions. Using the technique of anodic stripping voltammetry ( asv ), specific for reduced Mn(II) species, it is found that a major part of the <0.015 m Mn size fraction is present in a reduced Mn(II), asv -labile, form. In some waters there is also a significant asv inactive Mn fraction considered to be present as a `small colloidal' species. The soluble (<0.015 m) Mn fraction represents 15-95% of total Mn and does not appear to be dependent upon pH, alkalinity, specific conductance or humic substance concentration in the water. It is argued that under the dynamic, short residence time, conditions that apply in most rivers the paniculate and soluble Mn fractions are decoupled, their respective presence being dependent principally upon the catchment hydrogeological conditions. This contrasts with a previously held view that the paniculate phase is coupled to the dissolved phase by the pH dependent oxidation of dissolved Mn(II) to highly insoluble Mn(IV) species (Graham et al. , 1976). Consideration of manganese speciation in waters which were incubated for five months showed that pH becomes the controlling factor when equilibrium is approached.
Davison William
Laxen Duncan P. H.
Woof Colin
No associations
LandOfFree
Manganese chemistry in rivers and streams does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Manganese chemistry in rivers and streams, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Manganese chemistry in rivers and streams will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1227603