NDLI: Effect of competing ions and complexing organic substances on the cadmium uptake by the soil bacterium Sinorhizobium meliloti.

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Effect of competing ions and complexing organic substances on the cadmium uptake by the soil bacterium Sinorhizobium meliloti.

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Effect of competing ions and complexing organic substances on the cadmium uptake by the soil bacterium Sinorhizobium meliloti.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Slaveykova, Vera I. Dedieu, Karine Parthasarathy, Nalini Hajdu, Rita
Description	Country affiliation: Switzerland Author Affiliation: Slaveykova VI ( Environmental Biophysical Chemistry, Institute of Environmental Science and Technology, School of Architecture, Civil and Environmental Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland. vera.slaveykova@epfl.ch)
Abstract	In an effort to improve the understanding and prediction of Cd uptake by soil bacteria, adsorbed and intracellular Cd were determined in unpolluted and highly polluted model soil solutions within a concentration range spanning from 10(-9) to 5 x 10(-5) M Cd. In parallel, the free Cd ion concentrations ([Cd(2+)]) were measured by a hollow fiber permeation liquid membrane. Obtained results demonstrated that Cd uptake by bacterium Sinorhizobium meliloti was related to [Cd(2+)] in the solution. Addition of different complexing organic substances reduced [Cd(2+)] in the bacterial medium and decreased both adsorbed and intracellular Cd. The adsorbed Cd was considerably reduced in the presence of 10(-4) to 5 x 10(-2) M [Ca] or [Mg]. No effect on Cd adsorption was observed in the presence of Zn or Mn, even at 100-fold excess. Intracellular Cd decreased in the presence of a high excess of Ca and Zn, while no significant effect was observed in the presence of Mg. An increase of dissolved Mn from 10(-9) to 10(-8) M resulted in a twofold decrease of the intracellular Cd, but no clear trend was observed in the presence of 10(-7) to 10(-6) M Mn. Based on complexation and competition studies, the stability constants, necessary for quantitative description of Cd uptake by S. meliloti and the development of the bacterial biotic ligand model for Cd, were derived and validated in the solutions containing mixtures of Cd, Zn, Ca, and Mg. Further numerical simulations of Cd uptake by S. meliloti exposed to soil pore waters demonstrated the importance of Zn competition and the insignificant influence of Ca and H on Cd uptake.
File Format	HTM / HTML
ISSN	07307268
Issue Number	4
Volume Number	28
e-ISSN	15528618
Journal	Environmental Toxicology and Chemistry
Language	English
Publisher	Wiley
Publisher Date	2009-04-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Soil Pollutants Research Support, Non-u.s. Gov't Calcium Organic Chemicals Discipline Environmental Health Discipline Toxicology Predictive Value Of Tests Journal Article Solutions Discipline Chemistry Magnesium Diffusion Cadmium Sinorhizobium Meliloti Soil Microbiology Membranes, Artificial Ions Pharmacology Metabolism Drug Effects Zinc Chemistry Adsorption Analysis Ligands Manganese
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Health, Toxicology and Mutagenesis

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