Bioconcentration kinetics of hydrophobic chemicals in different densities of Chlorella pyrenoidosa

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 w...

Full description

Saved in:

Bibliographic Details
Published in:	Environmental toxicology and chemistry Vol. 17; no. 9; pp. 1695 - 1704
Main Authors:	Sijm, D.T.H.M. (Utrecht University, Utrecht, The Netherlands.), Broersen, K.W, Roode, D.F. de, Mayer, P
Format:	Journal Article
Language:	English
Published:	Hoboken Wiley Periodicals, Inc 01-09-1998 SETAC
Subjects:	Animal, plant and microbial ecology Applied ecology BIOACCUMULATION BIOACUMULACION Bioconcentration Biological and medical sciences CHEMICALS CHLORELLA Chlorella pyrenoidosa Ecotoxicology, biological effects of pollution Effects of pollution and side effects of pesticides on plants and fungi Fundamental and applied biological sciences. Psychology Hydrophobicity Physiology Phytoplankton Polychlorinated biphenyls PRODUCTOS QUIMICOS PRODUIT CHIMIQUE Pollutant behavior Algae Chlorophycophyta Hydrophobic compound Bioavailability Hydrophobicity Polychlorobiphenyl Marine environment Chlorella pyrenoidosa Chlorocarbon Phytoplankton Biological accumulation Thallophyta
Online Access:	Get full text
Tags:	Add Tag No Tags, Be the first to tag this record!

Description
Summary:	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, we 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 [Kow]. 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
Bibliography:	S20 1999002240 ark:/67375/WNG-QMLHH26S-9 ArticleID:ETC5620170908 istex:068D283A8817A6FA942C3EEC42CB3A30AEB117DD ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 ObjectType-Article-1 ObjectType-Feature-2
ISSN:	0730-7268 1552-8618
DOI:	10.1002/etc.5620170908