Confirmation method for the identification and determination of some organophosphorus and organochlorine pesticides in cocoa beans by gas chromatography-mass spectrometry.
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.
Rodríguez
P
P
Analytical Research Laboratory, Nutrexpa S.A., Barcelona, Spain.
Permanyer
J
J
Grases
J M
JM
González
C
C
D002099:Cacao / Q000032:analysis*; D008401:Gas Chromatography-Mass Spectrometry; D007306:Insecticides / Q000032:analysis*; D009943:Organophosphorus Compounds; D012997:Solvents; D013464:Sulfuric Acids
D007306:Insecticides; D009943:Organophosphorus Compounds; D012997:Solvents; D013464:Sulfuric Acids