EVALUATION OF A BUFFERED SOLID PHASE DISPERSION PROCEDURE ADAPTED FOR PESTICIDE ANALYSES IN THE SOIL MATRIX

• Main Author: Domínguez,Ana María
• Publication Date: 2015
• Other Authors: Funes,Mario, Fadic,Ximena, Placencia,Fabian, Cereceda,Francisco, Muñoz,Juan Pablo
• Format: Article
• Language: eng
• Source: Química Nova (Online)
• Download full: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422015000700884
• topic: soil; pesticide; solid phase dispersion extraction

An evaluation of the pesticides extracted from the soil matrix was conducted using a citrate-buffered solid phase dispersion sample preparation method (QuEChERS). The identification and quantitation of pesticide compounds was performed using gas chromatography-mass spectrometry. Because of the occurrence of the matrix effect in 87% of the analyzed pesticides, the quantification was performed using matrix-matched calibration. The method's quantification limits were between 0.01 and 0.5 mg kg-1. Repeatability and intermediate precision, expressed as a relative standard deviation percentage, were less than 20%. The recoveries in general ranged between 62% and 99%, with a relative standard deviation < 20%. All the responses were linear, with a correlation coefficient (r) ≥0.99.