Sorption of lead onto two gram-negative marine bacteria in seawater

Marine Chemistry
By:  and 

Links

Abstract

Laboratory adsorption experiments performed at environmentally significant lead (Pb) and cell concentrations indicate that the marine bacteria examined have significant binding capacities for Pb. However, the behavior governing Pb sorption onto gram-negative bacteria in seawater may be quite complex. The sorption kinetics appear to involve two distinct phases, i.e., a rapid removal of Pb from solution within the first few minutes, followed by a slow but nearly constant removal over many hours. Also, the average binding coefficient, calculated for Pb sorption onto bacteria and a measure of binding intensity, increases with decreasing sorption density (amounts of bacteria-associated Pb per unit bacterial surface) at low cell concentrations (105 cells ml−1), but decreases with decreasing sorption density at higher cell concentrations (107 cells ml−1). The latter effect is apparently due to the production of significant amounts of extra-cellular organics at high cell concentrations that compete directly with bacterial surfaces for available lead. Lead toxicity and active uptake by marine bacteria did not appear significant at the Pb concentrations used.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Sorption of lead onto two gram-negative marine bacteria in seawater
Series title Marine Chemistry
DOI 10.1016/0304-4203(85)90044-1
Volume 15
Issue 4
Year Published 1985
Language English
Publisher Elsevier
Contributing office(s) Toxic Substances Hydrology Program
Description 12 p.
First page 333
Last page 344