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Evaluation and in situ assessment of photodegradation of polyaromatic hydrocarbons in semipermeable membrane devices deployed in ocean water |
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| Authors: | Tatiana V Komarova Michael E Bartkow Steve Carter |
| Institution: | a The University of Queensland, National Research Centre for Environmental Toxicology (EnTox), 39 Kessels Road, Coopers Plains, Queensland, Australia b Swiss Federal Institute of Aquatic Science and Technology (Eawag), Department of Environmental Toxicology, CH-8600 Dübendorf, Switzerland c Queensland Health Forensic and Scientific Service (QHFSS), Queensland, Australia |
| Abstract: | Semipermeable membrane devices (SPMDs) were deployed in water using four different methods: a typical SPMD cage with and without a mesh cover, a bowl chamber and without any protection. In addition to routinely used performance reference compounds (PRCs), perdeuterated dibenza,h]anthracene was added. Due to its high sampler to water partition coefficient no measurable clearance due to diffusion was expected during the deployment period, hence any observed loss could be attributed to photodegradation. The loss of PRCs was measured and SPMD-based water concentrations determined. Results showed that a typical SPMD deployment cage covered with mesh provided the best protection from photodegradation. Samplers which had undergone the highest photodegradation underestimated PAH water concentrations by up to a factor of 5 compared to the most protected SPMDs. This study demonstrates that the potential for photodegradation needs to be addressed when samplers are deployed in water of low turbidity. |
| Keywords: | Performance reference compounds Photodegradation Semipermeable membrane devices |
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