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Residue analysis of chlorpyrifos (an organophosphate pesticide) was
investigated in different water samples. Analysis was carried out
in collaboration with pesticide residue laboratory Kala Shah Kaku
due to the availability of latest chromatographic techniques.
Chlorpyrifos was analyzed in different samples of water collected
from different sites of Lahore. Sample preparation was done by
using Solid Phase Extraction (SPE) technique. Analysis was carried
out using High Performance Liquid Chromatography (HPLC).
Acetonitrile, methanol solvents were used as mobile phase to
achieve the best separation. Chlorpyrifos was detected in 0.161
mg/L-1.912mg/L concentration ranges. Maximum residue limit of
chlorpyrifos in drinking water established by either World Health
Organization (WHO) or European Union (EU) is 0.040mg/L. The highest
concentration of chlorpyrifos residue was 1.912mg/L in water sample
collected from Kala Shah Kaku. Study of residue analysis of
chlorpyrifos in water has the significant role to solve the
environmental problems related to pesticides.
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