title: Photostability of methidathion in wet soil amended with biosolid and a surfactant under solar irradiation.
abstract: Photodegradation studies of the organophosphorous insecticide methidathion in thin layers of wet soil samples have been carried out under solar irradiation. Soil samples consisted of an agricultural soil added with two amendments: a municipal biosolid and the cationic surfactant TDTMA (tetradecyl trimethyl ammonium bromide). Dark controls of the different soil treatments were also considered. Soil and biosolid samples were previously autoclaved to eliminate biotic degradation. In this study we investigated the role of these amendments in methidathion photodegradation which is a rapid (<7 days) and indirect process. Although scarce differences were found between non-amended and amended samples, methidathion from soil exposed under sunlight is degraded more quickly than in dark conditions. Photodegradation products (methidathion oxon GS 13007 and GS 12956) were not detected.
authors.affiliation: Departamento de Ciencias de la Tierra y Química Ambiental, Estación Experimental del Zaidín (CSIC), E-18008 Granada, Spain.
authors.forename: Lourdes
authors.initials: L
authors.lastname: Sánchez
authors.forename: Esperanza
authors.initials: E
authors.lastname: Romero
authors.forename: Aránzazu
authors.initials: A
authors.lastname: Peña
mesh_terms: D002849:Chromatography, Gas; D002853:Chromatography, Liquid; D013058:Mass Spectrometry; D009946:Organothiophosphorus Compounds / Q000737:chemistry*; D010782:Photolysis / Q000528:radiation effects*; D000644:Quaternary Ammonium Compounds / Q000737:chemistry; D012722:Sewage / Q000737:chemistry; D012987:Soil / Q000032:analysis*; D013030:Spain; D013472:Sunlight; D013501:Surface-Active Agents / Q000737:chemistry; D050337:Trimethyl Ammonium Compounds
chemical_list: D009946:Organothiophosphorus Compounds; D000644:Quaternary Ammonium Compounds; D012722:Sewage; D012987:Soil; D013501:Surface-Active Agents; D050337:Trimethyl Ammonium Compounds; C005828:methidathion; C009410:tetradecyltrimethylammonium