Accumulation of Ag, Cd, Co, Cu, Hg, Ni and Pb in Pavlova viridis Tseng (Haptophyceae) |
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Authors: | Bi-lian Chen Qin Huang Xiao-jian Lin Qiao-qin Shi Song-gang Wu |
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Institution: | (1) The Bioengineering College, Fujian Normal University, Fuzhou, China;(2) The Swire Institute of Marine Science, The University of Hong Kong, Hong Kong |
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Abstract: | The flagellate alga Pavlova viridis Tseng was investigated in the laboratory for accumulation of the heavy metals, silver,
cadmium, cobalt, copper, mercury, nickel and lead. The cultures were grown in an artificial seawater medium mixed with the
individual metals at different concentrations. Based on data from the controls, the baseline metal concentrations in P. viridis
were shown to be in an order of Cu > Pb > Co > Cd > Ni > Ag > Hg. In the experimental groups, the seven metals displayed different
isotherm equilibrium patterns and the metal uptake capacity of the alga was Ni > Pb > Co > Hg > Cu > Cd > Ag at equilibrium.
When assessed using the bioconcentration factors, metal accumulation by P. viridis was demonstrated to be the most efficient
at a concentration of 0.001 mg L-1 for Ag, Cd and Co, and at 0.01 mg L-1 for Cu, Hg, Ni and Pb. This study suggests that P.
viridis can be a source of mineral supplements in mariculture. The alga is not, however, recognized as an effective agent
for removing heavy metals from wastewater.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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Keywords: | Pavlova viridis heavy metals mariculture mineral supplement metal accumulation bioconcentration factor metal removal microalgaew |
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