GC/MS is a technique used for the identification of pesticide
residues in a given sample. The extraction of pesticides from the
sample is done by using a solvent. The GC/MS gives the elution,
retention time and molecular weight of each pesticide in the
residue. The data obtained is then compared with that of a
referenced pesticide. In this experiment spinach, guava and orange
were used. The samples were divided into two groups: -
fruits/vegetables with pesticides and fruits/vegetables without
pesticides. The samples were extracted with acetonitrile in a
mixture of toluene. The extract was then analyzed in GC/MS. The
elution and retention time of pesticides residue was calculated and
the molecular weight of each pesticide was determined. The results
showed that low molecular weight pesticides were eluted first and
then the high molecular weight pesticides were eluted. The
molecular weight of each pesticide residue was compared with the
reference data and the pesticides were identified and the relative
abundance of each pesticide was calculated from GC/MS spectrum.
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