NDLI: Resource manipulation in uranium and arsenic attenuation by Lemna gibba L. (duckweed) in tailing water of a former uranium mine

Content Provider	Springer Nature Link
Author	Mkandawire, Martin Taubert, Barbara Dudel, E. Gert
Copyright Year	2005
Abstract	Influences of phosphorus and nitrogen on uranium and arsenic accumulation in Lemna gibba L. were investigated in the laboratory hydroponic cultures and in the field pot experiments. The initial uranium and arsenic concentrations in solutions for the hydroponic cultures were 1000 μ g l$^{−1}$ each, while in situ trials used tailing water containing 198.7 ± 20.0 μ g U l$^{−1}$ and 75.0 ± 0.4 μ g As l$^{−1}$ at a former uranium mine in eastern Germany. A test of three PO$_{4}$$^{3−}$ concentrations (0.01, 13.6 and 40.0 mg l$^{−1}$) in the hydroponic cultures, highest uranium accumulated in L. gibba under the culture with highest PO$_{4}$$^{3−}$. Significant differences in uranium accumulation were between 0.01 mg l$^{−1}$ and 13.6 mg l$^{−1}$ PO$_{4}$$^{3−}$ cultures only (ANOVA p = 0.05). In the field, addition of 40.0 mg l$^{−1}$ PO$_{4}$$^{3−}$ increased the bioaccumulation of uranium significantly. Contrary, high PO$_{4}$$^{3−}$ concentrations suppressed the bioaccumulation of arsenic in both the laboratory and the field. The bioaccumulation of both uranium and arsenic increased slightly with the increase of NH$_{4}$$^{+}$ concentration. However, high NH$_{4}$$^{+}$ concentrations reduced the yield in the control experiments. The concentration of uranium rose temporarily to 856.0 ± 294.0 μ g l$^{−1}$, while the concentration of arsenic sunk slightly and temporarily immediately after amending the tailing waters with 40 mg l$^{−1}$ PO$_{4}$$^{3−}$. The speciation of uranium in the tailing water was modelled with geochemical code PhreeqC, which predicted that uranyl carbonate species dominated before addition of phosphates, but after increasing the PO$_{4}$$^{3−}$ concentrations, uranyl phosphates species became dominant. Addition of NH$_{4}$$^{+}$ to the tailing water had negligible influence on free available uranium and arsenic concentrations. Thus, manipulations to enhance uranium and arsenic attenuation by L. gibba has limitation when the amendments interact with other elements including the contaminants in the milieu, and when the target contaminants have antagonistic behaviour in the tailing water.
Starting Page	83
Ending Page	101
Page Count	19
File Format	PDF
ISSN	00496979
Journal	Water, Air, and Soil Pollution
Volume Number	166
Issue Number	1-4
e-ISSN	15732932
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2005-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	ammonium bioaccumulation chemical speciation immobilisation phosphates resource manipulation tailing water uranium mines Hydrogeology Environment Atmospheric Protection/Air Quality Control/Air Pollution
Content Type	Text
Resource Type	Article
Subject	Ecological Modeling Environmental Chemistry Pollution Environmental Engineering Water Science and Technology

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