A new analysis method with GC or GC-MS for the quick detection of pesticide residues in vegetables.
J Chromatogr Sci
; 43(3): 158-62, 2005 Mar.
Article
em En
| MEDLINE
| ID: mdl-15842755
ABSTRACT
A new analytical method for gas chromatography (GC) or GC-mass spectrometry (MS) using the direct sampling technique is described. This direct sampling technique, which bypasses the conventional complicated sample pretreatment process, is applicable to cases of fast detection of pesticide residues in foods and large-scale screening of samples by portable GC in field detection. By a direct sampling technique, the vegetable sample is ground into paste, and 30 mg is placed directly into the evaporating chamber for GC-MS identification and quantitation (by full-scan mode). The GC column used is an HP-5 (30.0-m x 250-microm x 0.25-microm, 5% phenyl methyl siloxane). Chlorpyrifos, bromophos, fenpropathrin, gamma-666, and pp'-DDT are chosen to represent organophosphorus, pyrethrins, and organochlorine pesticides because they are chief objects of the detection of pesticide residues in vegetables. Rape, a common and mass-consumed vegetable in China, is chosen as the sample in this study. The detection limits for these pesticides by the full-scan mode are all below the maximum pesticide residue limit of vegetables set by the Ministry of Agriculture of China, and the reproducibility of this method is acceptable. This analysis method is proven to be simple, quick, and reliable and is suitable for multipesticide residues analysis of vegetables. It can also be used in the analysis of vegetable components and signal chemicals.
Buscar no Google
Base de dados:
MEDLINE
Assunto principal:
Verduras
/
Resíduos de Praguicidas
/
Cromatografia Gasosa
/
Cromatografia Gasosa-Espectrometria de Massas
Tipo de estudo:
Diagnostic_studies
Idioma:
En
Ano de publicação:
2005
Tipo de documento:
Article