GC-ECDGas Chromatograph-Electron Capture Detector
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A multiresidue QuEChERS-based method for analyzing pesticides in honey was proposed [45]; the honey was heated and dissolved in [Na.sub.2]EDTA prior to extraction with acetonitrile and d-SPE, and the resulting extract was analyzed by GC-ECD. Another method used UPLC-MS/MS for determining pesticides after QuEChERS extraction, which involved dissolving the honey in water and using a mixture of acidified acetonitrile/ethyl acetate [46].
2 shows the representative GC-ECD chromatograms of analysis of pesticide and PCBs standard mixture, fortified fish extract and extracts of highly contaminated fish samples from two locations; i.e.
For pe determination of endosulfan profenofos and bifenprin GC-ECD were used which contained Agilent 7890A gas chromatograph Injector auto- sampler 7683-B Capillary column HP-5MS (30 m A- 0.320 mm A- 0.25m) Detector -ECD.
Obtained standard mixture of samples were injected to GC-ECD system in mentioned conditions with 0.5, 0.75, 1, 1.5 and 2 [micro]g/ml concentration and calibration curve for each pesticide was prepared.
The data showed the evidence that capillary column GC-ECD could be used reliably and advantageously for pesticide analysis.
* Corresponding Author Email: najam.lubna@gmail.com, lubna_mini@yahoo.com Table 1: GC-ECD conditions.
Additional aliquots from six bottles of RM 8504, selected according to a stratified random sampling scheme, were analyzed by GC-ECD equipped with not only a DB-5 capillary column (described above) but also one with a relatively non-polar stationary phase (DB-XLB, J & W Scientific, Folsom, CA).
An Agilent 6890 gas chromatograph with a 5973 mass selective detector was used for confirming positive results on the GC-ECD. The inlet was operated in the splitless mode using a 4mm drilled Uniliner with a Press-Tight connector at 200[degrees]C for both solid phase microextraction and liquid injections.
Determination of PCBs and organochlorine pesticides by GC-ECD and GC/MS.