Extraction of pesticides using modified QuEChERs method for fruits, food, vegetables and other oil samples the recoveries are not achieved at the spiked concentration levels ?
Same issue in water samples ?
Pesticides getting degrading/converting all isomers together and giving higher concentration ?
Not all I faced some compounds in GC-MS/MS
Hope this discussion from Researchgate help you:
https://www.researchgate.net/post/Is_there_a_way_to_use_QuEChERS_to_extract_pesticide_residues_from_walnuts
Akram , appreciated your very useful remark. Discussion is required in this regard.
For some compounds a possible explanation for the low recoveries is the use of PSA. This adsorbent, a primary and secondary amine, can interact with acidic compounds
yielding low recoveries after the clean-up step.
In addition, some compounds are a troublesome
compounds for GC–MS analysis because of their thermal degradation. Moreover, it is reported that
chlorothalonil presents recovery problems in some matrices when extracted with acetonitrile.
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