An analytical method employing gas chromatography (GC) with nitrogen–phosphorus detection has been
developed for the simultaneous determination of eight insecticides (seven organophosphorus pesticides:
ethoprophos, diazinon, chlorpyrifos-methyl, fenitrothion, malathion, chlorpyrifos and fenamiphos, and
one thiadiazine: buprofezin) in banana leaves that are currently being used to feed cattle or hogs. The
extraction and preconcentration of these pesticides were carried out using a modified QuEChERS procedure
and the whole method was validated in terms of repeatability, linearity, precision and accuracy. Triphenylphosphate
was used as internal standard. Matrix effect evaluation was also carried out using a
matrix matched calibration. The developed procedure gave satisfactory recovery (89–104%) and relative
standard deviation values (