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Title: Bioconcentration kinetics of hydrophobic chemicals in different densities of Chlorella pyrenoidosa

Abstract

Algal density-dependent bioconcentration factors and rate constants were determined for a series of hydrophobic compounds in Chlorella pyrenoidosa. The apparent uptake rate constants of the hydrophobic compounds in algae varied between 200 and 710,000 L/kg/d, slightly increased with hydrophobicity within an experiment, were relatively constant for each algal density, and fitted fairly within existing allometric relationships. The bioavailability of the hydrophobic test compounds was significantly reduced by sorption by algal exudates. The sorption coefficients of the hydrophobic compounds to the algal exudates were between 80 and 1,200 L/kg, and were for most algal densities in the same order of magnitude as the apparent bioconcentration factors to the algae, that is, between 80 and 60,200 L/kg. In typical field situations, however, no significant reduction in bioavailability due to exudates is expected. The apparent elimination rate constants of the hydrophobic compounds were high and fairly constant for each algal density and varied between 2 and 190/d. Because the apparent elimination rate constants were higher than the growth rate constant, and were independent of hydrophobicity, the authors speculated that other factors dominate excretion, such as exudate excretion-enhanced elimination. Bioconcentration factors increased less than proportional with hydrophobicity, i.e., the octanol-water partition coefficient [K{sub ow}].more » The role of algal composition in bioconcentration is evaluated. Bioconcentrations (kinetics) of hydrophobic compounds that are determined at high algal densities should be applied with caution to field situations.« less

Authors:
; ; ;  [1]
  1. Utrecht Univ. (Netherlands)
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
675412
Resource Type:
Journal Article
Journal Name:
Environmental Toxicology and Chemistry
Additional Journal Information:
Journal Volume: 17; Journal Issue: 9; Other Information: PBD: Sep 1998
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 56 BIOLOGY AND MEDICINE, APPLIED STUDIES; WATER POLLUTION; FOOD CHAINS; ALGAE; POLYCHLORINATED BIPHENYLS; BIOLOGICAL ACCUMULATION; BIOLOGICAL INDICATORS

Citation Formats

Sijm, D T.H.M., Broersen, K W, Roode, D.F. de, and Mayer, P. Bioconcentration kinetics of hydrophobic chemicals in different densities of Chlorella pyrenoidosa. United States: N. p., 1998. Web. doi:10.1897/1551-5028(1998)017<1695:BKOHCI>2.3.CO;2.
Sijm, D T.H.M., Broersen, K W, Roode, D.F. de, & Mayer, P. Bioconcentration kinetics of hydrophobic chemicals in different densities of Chlorella pyrenoidosa. United States. https://doi.org/10.1897/1551-5028(1998)017<1695:BKOHCI>2.3.CO;2
Sijm, D T.H.M., Broersen, K W, Roode, D.F. de, and Mayer, P. 1998. "Bioconcentration kinetics of hydrophobic chemicals in different densities of Chlorella pyrenoidosa". United States. https://doi.org/10.1897/1551-5028(1998)017<1695:BKOHCI>2.3.CO;2.
@article{osti_675412,
title = {Bioconcentration kinetics of hydrophobic chemicals in different densities of Chlorella pyrenoidosa},
author = {Sijm, D T.H.M. and Broersen, K W and Roode, D.F. de and Mayer, P},
abstractNote = {Algal density-dependent bioconcentration factors and rate constants were determined for a series of hydrophobic compounds in Chlorella pyrenoidosa. The apparent uptake rate constants of the hydrophobic compounds in algae varied between 200 and 710,000 L/kg/d, slightly increased with hydrophobicity within an experiment, were relatively constant for each algal density, and fitted fairly within existing allometric relationships. The bioavailability of the hydrophobic test compounds was significantly reduced by sorption by algal exudates. The sorption coefficients of the hydrophobic compounds to the algal exudates were between 80 and 1,200 L/kg, and were for most algal densities in the same order of magnitude as the apparent bioconcentration factors to the algae, that is, between 80 and 60,200 L/kg. In typical field situations, however, no significant reduction in bioavailability due to exudates is expected. The apparent elimination rate constants of the hydrophobic compounds were high and fairly constant for each algal density and varied between 2 and 190/d. Because the apparent elimination rate constants were higher than the growth rate constant, and were independent of hydrophobicity, the authors speculated that other factors dominate excretion, such as exudate excretion-enhanced elimination. Bioconcentration factors increased less than proportional with hydrophobicity, i.e., the octanol-water partition coefficient [K{sub ow}]. The role of algal composition in bioconcentration is evaluated. Bioconcentrations (kinetics) of hydrophobic compounds that are determined at high algal densities should be applied with caution to field situations.},
doi = {10.1897/1551-5028(1998)017<1695:BKOHCI>2.3.CO;2},
url = {https://www.osti.gov/biblio/675412}, journal = {Environmental Toxicology and Chemistry},
number = 9,
volume = 17,
place = {United States},
year = {Tue Sep 01 00:00:00 EDT 1998},
month = {Tue Sep 01 00:00:00 EDT 1998}
}