Phytotoxicity of surface waters of the Thames and Brisbane River Estuaries: A combined chemical analysis and bioassay approach for the comparison of two systems

Bengtson Nash, S. M., Goddard, J. and Müller, J. F. (2006) Phytotoxicity of surface waters of the Thames and Brisbane River Estuaries: A combined chemical analysis and bioassay approach for the comparison of two systems. Biosensors & Bioelectronics, 21 11: 2086-2093. doi:10.1016/j.bios.2005.10.016


Author Bengtson Nash, S. M.
Goddard, J.
Müller, J. F.
Title Phytotoxicity of surface waters of the Thames and Brisbane River Estuaries: A combined chemical analysis and bioassay approach for the comparison of two systems
Journal name Biosensors & Bioelectronics   Check publisher's open access policy
ISSN 0956-5663
Publication date 2006-01-01
Sub-type Article (original research)
DOI 10.1016/j.bios.2005.10.016
Volume 21
Issue 11
Start page 2086
End page 2093
Total pages 8
Place of publication Oxford
Publisher Elsevier Advanced Technology
Collection year 2006
Language eng
Subject C1
291104 Environmental Technologies
730210 Environmental health
Abstract The Thames Estuary, UK, and the Brisbane River, Australia, are comparable in size and catchment area. Both are representative of the large and growing number of the world's estuaries associated with major cities. Principle differences between the two systems relate to climate and human population pressures. In order to assess the potential phytotoxic impact of herbicide residues in the estuaries, surface waters were analysed with a PAM fluorometry-based bioassay that employs the photosynthetic efficiency (photosystem II quantum yield) of laboratory cultured microalgae, as an endpoint measure of phytotoxicity. In addition, surface waters were chemically analysed for a limited number of herbicides. Diuron atrazine and simazine were detected in both systems at comparable concentrations. In contrast, bioassay results revealed that whilst detected herbicides accounted for the observed phytotoxicity of Brisbane River extracts with great accuracy, they consistently explained only around 50% of the phytotoxicity induced by Thames Estuary extracts. Unaccounted for phytotoxicity in Thames surface waters is indicative of unidentified phytotoxins. The greatest phytotoxic response was measured at Charing Cross, Thames Estuary, and corresponded to a diuron equivalent concentration of 180 ng L-1. The study employs relative potencies (REP) of PSII impacting herbicides and demonstrates that chemical analysis alone is prone to omission of valuable information. Results of the study provide support for the incorporation of bioassays into routine monitoring programs where bioassay data may be used to predict and verify chemical contamination data, alert to unidentified compounds and provide the user with information regarding cumulative toxicity of complex mixtures. (c) 2005 Elsevier B.V. All rights reserved.
Keyword Brisbane River
Photosystem Ii
Herbicides
Biophysics
Biotechnology & Applied Microbiology
Chemistry, Analytical
Electrochemistry
Nanoscience & Nanotechnology
Toxic Equivalency Factors
Aquatic Plants
Hervey Bay
Assay
Contamination
Biosensor
Quality
Q-Index Code C1

 
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Created: Wed, 15 Aug 2007, 19:03:37 EST