Bioavailability of labile and desorption-resistant phenanthrene sorbed to montmorillonite clay containing humic fractions
Journal Article
·
· Environmental Toxicology and Chemistry
The biodegradation of {sup 14}C-labeled phenanthrene in the presence of particles of montmorillonite and fulvic and humic acid-montmorillonite complexes was studied in a batch system. A mathematical model that takes into account the contribution to mineralization by the slowly desorbing compound was used to calculate the initial mineralization rates. Sorption of phenanthrene to the particles was determined in sorption isotherms, and desorption was measured during successive water extractions. Mineralization rates in equilibrated suspensions were higher than predicted from aqueous equilibrium concentrations, and in some cases, montmorillonite and fulvic acid-montmorillonite complexes stimulated the phenanthrene transformation rates. In contrast with the high bioavailability exhibited by phenanthrene sorbed as a labile form, biodegradation of the desorption-resistant phenanthrene occurred slowly and followed zero-order kinetics, which indicated a limitation caused by slow desorption. The results suggest that the mechanism of sorption may cause a differential bioavailability of the sorbed compound.
- Research Organization:
- C.S.I.C., Sevilla (ES)
- OSTI ID:
- 20012771
- Journal Information:
- Environmental Toxicology and Chemistry, Journal Name: Environmental Toxicology and Chemistry Journal Issue: 12 Vol. 18; ISSN ETOCDK; ISSN 0730-7268
- Country of Publication:
- United States
- Language:
- English
Similar Records
Effect of humic fractions and clay on biodegradation of phenanthrene by a Pseudomonas fluorescens strain isolated from soil
Organic pollutant sorption onto dissolved and sorbed humics, fulvics and humin
Correlation between biological and physical availabilities of phenanthrene in soils and soil humin in aging experiments
Journal Article
·
Sat Aug 01 00:00:00 EDT 1998
· Applied and Environmental Microbiology
·
OSTI ID:642349
Organic pollutant sorption onto dissolved and sorbed humics, fulvics and humin
Conference
·
Fri Dec 30 23:00:00 EST 1994
·
OSTI ID:40057
Correlation between biological and physical availabilities of phenanthrene in soils and soil humin in aging experiments
Journal Article
·
Sun Aug 01 00:00:00 EDT 1999
· Environmental Toxicology and Chemistry
·
OSTI ID:20012726