title: Confirmation method for the identification and determination of some organophosphorus and organochlorine pesticides in cocoa beans by gas chromatography-mass spectrometry.
abstract: The main objective of this work is to develop a routine quality control method for pesticide residues in cocoa beans, using gas chromatography-mass spectrometry. The investigated pesticides, which are used to control pests in the growing of cacao, are: Acephate, Propoxur, HCH, Heptachlor, Fenitrothion, Pirimiphos-methyl, Aldrin, Dieldrin, pp'-DDE, op-DDE and DDT. Two extraction methods were tested. The first was based on strong attack by concentrated sulphuric acid and later extraction with n-hexane: the investigated residues were Acephate, HCH, Fenitrothion and DDT; recoveries were 68-95% and the detection limits 0.5-10 ppb. The second extraction method was based on the Universal Trace Residue Extractor (UNITREX), which consists of a distillation system for organophosphorus and organochlorine pesticides in fatty samples. The investigated residues were Heptachlor, Pirimiphos-methyl, Aldrin, Propoxur, Dieldrin, op-DDE and pp'-DDE; recoveries were 67-88% and the detection limits 1-10 ppb.
authors.affiliation: Analytical Research Laboratory, Nutrexpa S.A., Barcelona, Spain.
authors.forename: P
authors.initials: P
authors.lastname: Rodríguez
authors.forename: J
authors.initials: J
authors.lastname: Permanyer
authors.forename: J M
authors.initials: JM
authors.lastname: Grases
authors.forename: C
authors.initials: C
authors.lastname: González
mesh_terms: D002099:Cacao / Q000032:analysis*; D008401:Gas Chromatography-Mass Spectrometry; D007306:Insecticides / Q000032:analysis*; D009943:Organophosphorus Compounds; D012997:Solvents; D013464:Sulfuric Acids
chemical_list: D007306:Insecticides; D009943:Organophosphorus Compounds; D012997:Solvents; D013464:Sulfuric Acids