Abstract
AbstractThis paper reports the concentrations of the herbicide simazine which were found in a stream draining a small agricultural catchment as a result of normal agricultural practice. The study, part of the National Rivers Authority Research and Development programme, shows that peaks in the concentration of simazine occurred very soon after rainfall events. It goes on to show that although the mass of simazine transported from the catchment during each rainfall event is small as a percentage of that applied (less than 1%), the concentrations observed are far from insignificant. It is suggested that monitoring programmes need to be designed to cover such pesticide pulses generated as the result of rainfall events occurring at times of peak application. Also, more realistic environmental‐quality standards need to be developed and applied where the EC drinking water Directive is inappropriate, and to reflect the intermittent nature of the problem.
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