Analysis and incidence of organophosphorus compounds in sewage sludges.
D002849:Chromatography, Gas; D007306:Insecticides / Q000032:analysis*; D009943:Organophosphorus Compounds; D012722:Sewage / Q000032:analysis*
D007306:Insecticides; D009943:Organophosphorus Compounds; D012722:Sewage