Estimation of direct-contact fraction for phenanthrene in surfactant solutions by toxicity measurement
SCIE
SCOPUS
- Title
- Estimation of direct-contact fraction for phenanthrene in surfactant solutions by toxicity measurement
- Authors
- Lee, HJ; Lee, MW; Lee, DS; Woo, SH; Park, JM
- Date Issued
- 2007-09-30
- Publisher
- ELSEVIER SCIENCE BV
- Abstract
- The toxicity of solutions containing nonionic surfactants Tween 80, Brij 35 and/or phenanthrene to Pseudomonas putida ATCC 17484 was investigated. The fraction of direct contact between micellar-phase phenanthrene and bacterial cell surface was estimated by using the toxicity data and a mathematical model. The mathematical model was used to calculate phenanthrene concentration in the micellar phase and aqueous pseudophase separately. The first-order death rate constant increased from 0.088 +/- 0.016 to 0.25 +/- 0.067 h(-1) when the phenanthrene concentration was increased from 0 to 5.17 x 10(-6) M (equals water solubility). The intrinsic toxicity of surfactant was higher in Brij 35 than in Tween 80. When phenanthrene concentration was increased to 9.7 x 10(-5) M in surfactant solutions, the death rate constant increased to 1.8 +/- 0.024 and 0.41 +/- 0.088 h(-1) for 8.4 x 10(-4) M Brij 35 and 7.6 x 10(-4) M Tween 80. The direct-contact fraction was 0.083 and 0.044 for Brij 35 and Tween 80, respectively, under these conditions using exponential model. The toxicity increased with increasing phenanthrene concentration at a fixed surfactant concentration. The toxicity decreased with increasing the surfactant concentration at a fixed phenanthrene concentration due to decreased contact of bacteria with phenanthrene present in the interior of surfactant micelles. (c) 2007 Elsevier B.V All rights reserved.
- Keywords
- bioavailability; direct contact; PAH; surfactant; toxicity; POLYCYCLIC AROMATIC-HYDROCARBONS; SOIL-WATER SYSTEMS; NONIONIC SURFACTANT; MICELLAR PHASE; BIODEGRADATION; SOLUBILIZATION; BIOAVAILABILITY; KINETICS; MINERALIZATION; BACTERIA
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/23121
- DOI
- 10.1016/J.JBIOTEC.2007.07.953
- ISSN
- 0168-1656
- Article Type
- Article
- Citation
- JOURNAL OF BIOTECHNOLOGY, vol. 131, no. 4, page. 448 - 457, 2007-09-30
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- There are no files associated with this item.
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