Evaluation of pesticide adsorption in gas chromatographic injector and column

Química Nova

Pinho, Gevany Paulino de¹  Queiroz, Maria Eliana Lopes Ribeiro de¹  Neves, Antônio Augusto¹  Silvério, Flaviano Oliveira¹  Universidade Federal de Minas Gerais, Montes Claros, Brasil¹  Universidade Federal de Viçosa, Viçosa, Brasil¹ 

关键词: matrix effects;    pesticides;    gas chromatography.;   

DOI  :  10.1590/S0100-40422012000400016

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

Components in complex matrices can cause variations in chromatographic response during analysis of pesticides by gas chromatography. These variations are related to the competition between analytes and matrix components for adsorption sites in the chromatographic system. The capacity of the pesticides chlorpyrifos and deltamethrin to be adsorbed in the injector and chromatographic column was evaluated by constructing three isotherms and changing the column heating rate to 10 and 30 ºC min-1. By using ANCOVA to compare the slope of calibration graphs, results showed that the higher the injector temperature (310 ºC) the lower the pesticide adsorption. Also, deltamethrin influenced the adsorption of chlorpyrifos on the column chromatographic.

【 授权许可】

Unknown