Abstract
Triazine and urea herbicides are two groups of photosystem II inhibiting herbicides frequently detected in surface, ground and marine waters. Yet, there are few water quality guidelines for herbicides. Ecotoxicity thresholds (ETs) for ametryn, hexazinone and simazine (triazine herbicides) and diuron (a urea herbicide) were calculated using the Australian and New Zealand method for deriving guideline values to protect fresh and marine ecosystems. Four ETs were derived for each chemical and ecosystem that should theoretically protect 99, 95, 90 and 80% of species (i.e. PC99, PC95, PC90 and PC80, respectively). For all four herbicides, the phototrophic species were significantly more sensitive than non-phototrophic species, and therefore, only the former data were used to calculate the ETs. Comparison of the ET values to measured concentrations in 2606 samples from 15 waterways that discharge to the Great Barrier Reef (2011–2015) found three exceedances of the simazine PC99, regular exceedances (up to 30%) of the PC99 in a limited number of rivers for ametryn and hexazinone and frequent (> 40%) exceedances of the PC99 and PC95 ETs in at least four waterways for diuron. There were no exceedances of the marine ETs in inshore reef areas. Further, ecotoxicity data are required for ametryn and hexazinone to fresh and marine phototrophic species, for simazine to marine phototrophic species, for tropical phototrophic species, repeated pulse exposures and long-term (2 to 12 months) exposures to environmentally relevant concentrations.
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This work is part of a considerably larger project to derive ET values for 45 pesticides that was funded by: the National Water Reform Committee, Australian Department of Environment and Energy, the National Environmental Sciences Program (NESP), the Queensland Department of Environment and Heritage Protection (DEHP) and the Queensland Department of Science, Information Technology and Innovation (DSITI). Two anonymous referees helped improve the manuscript.
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Warne, M.S.J., King, O. & Smith, R.A. Ecotoxicity thresholds for ametryn, diuron, hexazinone and simazine in fresh and marine waters. Environ Sci Pollut Res 25, 3151–3169 (2018). https://doi.org/10.1007/s11356-017-1097-5
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DOI: https://doi.org/10.1007/s11356-017-1097-5