4 CONCLUDING REMARKS
An efficient method was introduced for the simple determination
of the OPPs diazinon, malathion, and chlorpyrifos in
the river, sea, and well water samples. The method, termed
as microfunnel-filter-based emulsification microextraction,
provides a high sensitivity for determination of the target
analytes. Since the maximum residue limits for OPPs in
water samples are in the range of 20–100 ng/mL, the method
provides suitable LODs in the range of 4–8 ng/mL. The
method can be performed in a few minutes, it is centrifugefree,
and by dispersion of the acceptor phase into a high
volume of the sample solution, a high PF is provided (in the
range of 306–342). The proposed method was directly, and
without any pretreatment, used for the determination of the
target analytes in all the understudied water samples using a
simple micro-funnel that made it possible to utilize low-toxic
solvents in the extraction process, and by filtration of the
extracting phase, the sample clean-up was enhanced.
ACKNOWLEDGMENT
The