ProjectMicrobial and Photolytic Transformations of Superfund Chemicals
Project Leaders: Andrew Schuler, Karl Linden
Publications ↓Project Description
The broad objective of this project is to elucidate the separate and combined effects of microbial and photolytic processes on transformations of target Superfund chemicals, with applications to gaining a better understanding of natural transformation processes at existing Superfund sites and to developing improved systems for remediation. These chemicals will include organophosphate pesticides (chlorpyrifos, parathion, and diazonon) and polycyclic aromatic hydrocarbons (fluorene and its heterocyclic analogs carbazole, dibenzofuran, and dibenzothiophene; fluoranthene; and benzo[a]pyrene). This work will yield important information regarding the fundamental processes affecting toxic exposures in natural systems, and it will include the development of new strategies for decreasing these exposures through improved remediation systems. The specific aims of this project are as follows:
- Assess the separate photolytic and microbial
- isolate transformations of individual target Superfund chemicals.
- Determine photolytic and microbial transformation effects on toxicity and identify intermediates of interest.
- Assess biodegradability of photolytic intermediates and photodegradability of biodegradation intermediates.
- Evaluate influence of physical, chemical, and biological factors on microbial and photolytic degradation, including mixture effects.
- Develop and evaluate novel remediation technologies based on an innovative combination of photolytic, oxidative, and microbial transformation processes.
This work will interface strongly with the other Projects in this proposal through its focus on the same OPs and PAHs, and through its use of their toxicity assays to assess the toxicity of photolytic and microbial intermediates.
Description ↑Publications
Cooper, E.M., H.M. Stapleton, C.W. Matson, R.T. Di Giulio, and A.J. Schuler. UV treatment and biodegradation of dibenzothiophene: identification and toxicity of products. Environmental Toxicology and Chemistry (accepted).
Eischeid AC, Meyer JN, Linden KG. 2009. UV disinfection of adenoviruses: molecular indications of DNA damage efficiency. Applied and Environmental Microbiology 75: 23-28. PMCID 2612207
Watts, M.J and Linden KG. 2009. Advanced oxidation kinetics of aqueous trialkyl phosphate flame retardants and plasticizers. Environ Sci Technol. 15;43:2937-42. PMCID: 19475974
Shemer, H., Linden, K.G. 2007. Aqueous photodegradation and toxicity of the polycyclic aromatic hydrocarbons fluorene, dibenzofuran and dibenzothiophene, Water Research, Vol. 41, No 4, 853-861.
Shemer, H., Linden, K.G. 2007. Photolysis, oxidation and subsequent toxicity of a mixture of polycyclic aromatic hydrocarbons in natural waters, Journal of Photochemistry and Photobiology A: Chemistry In Press, online 10 November 2006
Shemer, H., Linden, K.G. 2006. Degradation and byproduct formation of diazinon using UV and UV/H2O2 processes, Journal of Hazardous Materials Vol. 136, No. 3, 553-559
Shemer, H., Sharpless, C.M., Linden, K.G. 2005. Photodegradation of 3,5,6-trichloro-2-pyridinol in aqueous solution, Water, Air, and Soil Poll. Vol. 168, No. 1-4, 145-155.
Shemer, H., Sharpless, C.M., Linden, K.G. 2005. Photodegradation of 3,5,6-trichloro-2-pyridinol in aqueous solution, Water, Air, and Soil Poll. Vol. 168, No. 1-4, 145-1
Cooper, E.M. and Dharni Vasudevan. 2003. Comparison of hydroxynaphthoic acid isomer sorption onto goethite: Batch, ATR-FTIR and Computational chemistry approaches. In: Proceedings of the 226th ACS (American Chemical Society) National Meeting, September 7-11, 2003. New York, NY.
Sutton, D., Zbigniew Kabala, A.B. Francisco, and Dharni Vasudevan. 2001. Limitations and Potential of Commercially Available Rhodamine WT as a Groundwater Tracer. Water Resources Research. 37(6):1641-1656.
Vasudevan, Dharni, R.L. Fimmen, and A.B. Francisco. 2001. Tracer Grade Rhodamine WT: Structure of constituent isomers and their sorption behavior. Environmental Science and Technology. 35:4089-4096.