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The Environment Agency are concerned with the impact of nine herbicides approved for use in or near water: asulam, dalapon, dichlobenil, diquat, 2,4-D amine, fosamine ammonium, glyphosate, maleic hydrazide and terbutryn. The purpose of this report is to review the available environmental data on those herbicides approved for use in England and Wales and, where necessary, make recommendations for the de·telopment of Environmental Quality Standards (EQSs).
The review comprises an effects and exposure assessment of these herbicides relating to the aquatic environment. The effects assessment derives from a review of their toxicity, persistence and bioaccumulation while the exposure assessment is based on an evaluation of the fate and behaviour of these chemicals in aquatic habitats combined with information concerning their production and usage in the UK.