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Advisor(s)
Abstract(s)
We have developed a new method for single-drop
microextraction (SDME) for the preconcentration of organochlorine
pesticides (OCP) from complex matrices. It is based
on the use of a silicone ring at the tip of the syringe. A 5 μL
drop of n-hexane is applied to an aqueous extract containing
the OCP and found to be adequate to preconcentrate the OCPs
prior to analysis by GC in combination with tandem mass
spectrometry. Fourteen OCP were determined using this technique
in combination with programmable temperature vaporization.
It is shown to have many advantages over traditional
split/splitless injection. The effects of kind of organic solvent,
exposure time, agitation and organic drop volume were
optimized. Relative recoveries range from 59 to 117 %, with
repeatabilities of <15 % (coefficient of variation) were
achieved. The limits of detection range from 0.002 to
0.150 μg kg−1. The method was applied to the preconcentration
of OCPs in fresh strawberry, strawberry jam, and soil.
Description
Keywords
Organochlorine pesticides SDME GC-MS/MS