M. Erk et al., THE INTERACTIONS OF MN-54 WITH HUMIC SUBSTANCES OF FRESH-WATER SEDIMENT ORIGIN, Journal of environmental radioactivity, 35(2), 1997, pp. 203-219
The interactions of Mn-54 radionuclide with humic (HAB) and fulvic aci
d (FAB) isolated from freshwater sediment of the Butoniga impoundment
were studied in a freshwater system from Butoniga impoundment, and in
a diluted seawater system from the Rasla Bay at elevated pH by high-vo
ltage paper electrophoresis. rn this way, it was possible to detect ca
tionic, anionic and immobile Mn-54 species, and to calculate their ele
ctrophoretic mobilities. The interaction of Mn-54 with humic substance
s (HS) in a freshwater system is demonstrated by the formation of an e
lectrophoretically immobile zone and the formation of the cationic for
ms of Mn-54 having smaller electrophoretic mobilities than cationic fo
rms of Mn-54 in a freshwater system without HS added. The amount of ca
tionic forms decreases in the presence of HS. This effect is enhanced
with an increase in HS concentration in the range 5-100 mg l(-1) and i
n an increase in pH from 9.5 to 10.5. The addition of HAB up to 100 mg
l(-1) and the increase of pH from 7.9 to 9.0 in diluted seawater syst
ems do not cause significant changes of cationic electrophoretic mobil
ities of Mn-54, nor the formation of an electrophoretically immobile f
orm of Mn-54. (C) 1997 Elsevier Science Limited.