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Journal of the Chilean Chemical Society

On-line version ISSN 0717-9707

Abstract

RIVAS, JORGE  and  VALENZUELA, MARÍA LUISA. SORPTION OF APOLAR PESTICIDES BY UNITS OF BENZOIC ACID PROPYL ESTER IN CYCLIC PHOSPHAZENE. J. Chil. Chem. Soc. [online]. 2017, vol.62, n.4, pp.3783-3787. ISSN 0717-9707.  http://dx.doi.org/10.4067/s0717-97072017000403783.

The effects of temperature, pH and agitation time (equilibrium) on the adsorption process of different pesticides on N3P3(OC6H4COOCH2CH2CH3)6 was studied. With optimal conditions experimental, the adsorption isotherms have been realized with through Langmuir and Freundlich models. Pesticides are compounds used mainly in agriculture to control various species (plants, insects, worms, fungi). Due to their physicochemical properties, they can remain for a long time in the application sites, bioaccumulating and moving between environmental compartments which generate various environmental problems. The results obtained showed a physisorption mechanism for the five pesticides studied, with higher sorption for: azinphos methyl (93,5 mg kg-1), carbaryl (290.5 mg kg-1) and carbofuran (580.5 mg kg-1) at 20 ° C, according to the models used.

Keywords : Sorption; pesticides; cyclic phosphazene.

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