School of Geography and the Environment, University of Oxford, South Parks Road, Oxford, OX1 3QY, UK.
Environ Sci Process Impacts. 2017 Apr 19;19(4):586-595. doi: 10.1039/c6em00527f.
The application of metaldehyde to agricultural catchment areas to control slugs and snails has caused severe problems for drinking water supply in recent years. In the River Thames catchment, metaldehyde has been detected at levels well above the EU and UK drinking water standards of 0.1 μg l at many sites across the catchment between 2008 and 2015. Metaldehyde is applied in autumn and winter, leading to its increased concentrations in surface waters. It is shown that a process-based hydro-biogeochemical transport model (INCA-contaminants) can be used to simulate metaldehyde transport in catchments from areas of application to the aquatic environment. Simulations indicate that high concentrations in the river system are a direct consequence of excessive application rates. A simple application control strategy for metaldehyde in the Thames catchment based on model results is presented.
近年来，聚乙醛在农业集水区的应用控制鼻涕虫和蜗牛，已对饮用水供应造成严重问题。在泰晤士河流域，2008 年至 2015 年间，在流域内许多地点检测到聚乙醛的浓度远远超过欧盟和英国饮用水标准的 0.1μg/L。聚乙醛在秋季和冬季施用，导致地表水中的浓度增加。研究表明，基于过程的水-生物地球化学输运模型（INCA-污染物）可用于模拟从施药区到水生环境的聚乙醛在集水区中的输运。模拟表明，河系中高浓度是过量施药率的直接后果。根据模型结果，提出了一种针对泰晤士河流域聚乙醛的简单施药控制策略。
