Cobalt-copper and cobalt-zinc effects on duckweed growth and metal accumulation
Titel:
Cobalt-copper and cobalt-zinc effects on duckweed growth and metal accumulation
Auteur:
Dirilgen, N. Inel, Y.
Verschenen in:
Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering
Paginering:
Jaargang 29 (1994) nr. 1 pagina's 63-81
Jaar:
1994-01
Inhoud:
Zn+2, Cu+2 and Co+2 were added to Jacob nutrient medium with constant pH value at concentrations ranging from 0.10-10.0 ppm, 0.20-2.00 ppm and 0.20-20.0 ppm, respectively. The IC50's for these metals as well as their effects on the growth and the accumulation efficiency by Lemna minor L. were determined. The IC50's for Co+2, Zn+2and Cu+2 were 16.90, 10.00 and 1.54 ppm, respectively. At 0.20-2.00 ppm concentrations, the potential of Lemna minor L. to accumulate these metals with respect to their inital concentrations in the medium was in the following order: Co+2 > Zn+2 > Cu+2. The effects of the metal pairs of Co+2-Cu+2 and Co+2-Zn+2 at concentration levels ranging from 0.10 to 2.00 ppm were also tested. The accumulation of Zn+2 was stimulated by Co+2 and the accumulation of Co+2 was inhibited by Zn+2. Also a decrease in the growth of Lemna minor L. was observed, especially at 2.00 ppm. The accumulation of Co+2 was suppressed by Cu+2, whereas the accumulation of Cu+2 was slightly promoted by Co+2. The growth Inhibition effect of Cu+2 was not changed by Co+2 at 0.10 through 1.00 ppm, but at 2.00 ppm, Co+2 reduced the growth Inhibitory effect of Cu+2.
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