2.4. Analysis
The tomato samples were analyzed for pesticide residues in the laboratory
of Centro de Aguas y Saneamiento Ambiental at Universidad
Mayor de San Simon, Cochabamba, Bolivia.
The pre-treatment for the samples was conducted according to
QuEChERS — Multiresidue Method for the Analysis of Pesticides. The
quantification of residual levels was performed by gas chromatography
following an adapted method of US Environmental Protection Agency
(USEPA), 1996. The pesticides analyzed were: Aldrin, dieldrin,