%0 Journal Article
%T Uso del 芍cido sulf迆rico en las determinaciones de plaguicidas organoclorados: I. Calidad qu赤mico-anal赤tica de la precipitaci車n de grasa por el 芍cido sulf迆rico concentrado en muestras con alto contenido de l赤pidos
%A WALISZEWSKI
%A Stefan M
%A M車JICA GARC赤A
%A X車chitl
%A INFANZ車N
%A Rosa M
%A BARRADAS DERMITZ
%A Dulce Mar赤a
%A CARVAJAL ZARRABAL
%A Octavio
%J Revista internacional de contaminaci車n ambiental
%D 2008
%I Universidad Nacional Aut車noma de M谷xico
%X many papers describe analytical methods for organochlorine pesticide residue determinations in environmental samples. gas chromatography with electron capture detection requires highly purified extracts, ie. with an efficient clean-up step. to achieve this purpose, different clean-up methods are employed. most organochlorine pesticides are resistant to sulfuric acid, a property used for the destruction of endogenous compounds and fat precipitation. both fat extract treatments that use sulfuric acid as a clean-up medium, and quantities of nonvolatile residues determined after the clean-up step, are described. samples of adipose tissues (human, bovine, pig and chicken), butter and margarine were studied. the analytical method allows good (higher than 90 %) organo-chlorine pesticide recovery and an extract ready for gas chromatography with a minimal amount of nonvolatile compounds (0.8 to 2.2 mg that constitutes 0.22 to 1.87 % of the analyzed sample) determined gravimetrically. the low quantity of nonvolatile residues present in cleaned-up extracts allows multiple sample gas chromatographies without diminishing column resolution and electron capture detector response. the analytical quality study (10 repetitions for each fat sample) shows a 4.8 to 12.5 % coefficient of variation, indicating an appropriate method for fat sample monitoring studies.
%K organochlorine pesticides
%K fats
%K sulfuric acid.
%U http://www.scielo.org.mx/scielo.php?script=sci_abstract&pid=S0188-49992008000100004&lng=en&nrm=iso&tlng=en