Reduced metribuzin pollution with phosphatidylcholine-clay formulations.

Background: Metribuzin is a widely used herbicide that has been identified as a groundwater contaminant. In this study, slow-release formulations of metribuzin were designed by encapsulating the active ingredient in phosphatidylcholine (PC) vesicles and adsorbing the vesicles onto montmorillonite.

Results: The maximum active ingredient content in the slow-release formulations was 246 g kg(-1) .