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Association mechanisms of europium(III) and curium(III) with Chlorella vulgaris
Author(s) -
Ozaki Takuo,
Kimura Takaumi,
Ohnuki Toshihiko,
Yoshida Zenko,
Francis Arokiasamy J.
Publication year - 2003
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1897/02-481
Subject(s) - europium , chlorella vulgaris , chemistry , curium , adsorption , aqueous solution , chelation , cellulose , fluorescence , elution , nuclear chemistry , kinetics , inorganic chemistry , ion , chromatography , organic chemistry , botany , americium , algae , biology , physics , quantum mechanics , actinide
The association of Europium(III) (Eu[III]) and Curium(III) (Cm[III]) with Chlorella vulgaris and with cellulose was studied by a batch method and time‐resolved laser‐induced fluorescence spectroscopy (TRLFS). The kinetics study performed by the batch method showed that maximum adsorption of Eu(III) and Cm(III) on C. vulgaris was attained within 3 min of contact; afterward, the percentage adsorption decreased with time due to chelation of the ions with exudates released from C. vulgaris with a strong affinity for Eu(III) and Cm(III). The TRLFS revealed that the short‐term adsorption of Eu(III) on C. vulgaris was attributable to its coordination with cellulose on the algal cell wall. However, Eu(III) coordinated with the functional groups of cellulose very weakly despite the large distribution coefficients observed. These results indicate that the reactions, both at the cell's surfaces through adsorption and in solution phases through chelation with the exudates, are important in estimating the behavior of Eu(III) and Cm(III) in aqueous environments.