caa a22 4500 469106204 CHVBK 20180323133057.0 cr unu---uuuuu 170328e19920901xx s 000 0 eng 10.1007/BF00044714 doi (NATIONALLICENCE)springer-10.1007/BF00044714 Sorption of hydrophobic organic contaminants and trace metals on phytoplankton and implications for toxicity assessment [Elektronische Daten] [G-Yull Rhee, Patsy-Ann Thompson] The partitioning of trace metals and hydrophobic organic contaminants to phytoplankton determines their toxicity as well as their fate and transport in aquatic ecosystems. Accurate impact assessments, therefore, depend on a good understanding of the factors regulating the sorption of these compounds to biotic particles. The accumulation of chlorinated organic compounds in phytoplankton is generally considered as being due solely to physical sorption, described by reversible equilibrium models based on Langmuir or Freundlich isotherms. On the other hand, the uptake of trace metals is a two phase process: a fast sorption component viewed as an ionexchange or a covalent bonding process with cell surface ligands, followed by an intracellular transport phase that is dependent on cellular metabolic activity. The uptake of inorganic and hydrophobic organic pollutants and their bioaccumulation are influenced in a complex manner by duration of exposure and cell density, by environmental factors such as pH, the concentration of cations and of dissolved and colloidal organic matter, as well as by phytoplankton physiological condition. High concentrations of H+, Ca2+, and Mg2+ ions will reduce trace metal sorption by directly competing for uptake sites on the cell's surface, whereas the presence of dissolved organic carbon such as natural and synthetic chelators and phytoplankton exudates will reduce the bioavailability of both trace metals and hydrophobic organic contaminants. Thus, the impact of toxic contaminants on phytoplankton may be determined as much by the factors influencing uptake and partitioning as by the potency of the toxicants and interspecies differences in sensitivity. Recommendations for improving toxicity assessments are presented. Kluwer Academic Publishers, 1992 sorption kinetics nationallicence hydrophobic organic contaminants nationallicence trace metals nationallicence toxicity assessment nationallicence Rhee G-Yull Wadsworth Center for Laboratories and Research, State University of New York at Albany, New York State Department of Health, Empire State Plaza, 12201, Albany, New York, USA aut Thompson Patsy-Ann Wadsworth Center for Laboratories and Research, State University of New York at Albany, New York State Department of Health, Empire State Plaza, 12201, Albany, New York, USA aut Journal of Aquatic Ecosystem Health Kluwer Academic Publishers 1/3(1992-09-01), 175-191 0925-1014 1:3<175 1992 1 10813 https://doi.org/10.1007/BF00044714 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00044714 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Rhee G-Yull Wadsworth Center for Laboratories and Research, State University of New York at Albany, New York State Department of Health, Empire State Plaza, 12201, Albany, New York, USA aut NATIONALLICENCE 700 1- Thompson Patsy-Ann Wadsworth Center for Laboratories and Research, State University of New York at Albany, New York State Department of Health, Empire State Plaza, 12201, Albany, New York, USA aut NATIONALLICENCE 773 0- Journal of Aquatic Ecosystem Health Kluwer Academic Publishers 1/3(1992-09-01), 175-191 0925-1014 1:3<175 1992 1 10813 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer