sherif Taha

residue pesticides lc ms ms mass spectrometry gc ms ms analysis c 18 solid phase selectivity peak separation residue analysis mobile phase column hplc flashback solvent condensation retention time gc column liner splitless injection split injection gas chromatography luke method sweden pesticide extraction methode quchers analyses mrm gap cxl usfda codex efsa mrl m/z linear trap single ion monitoring collision focusing rf-only time-of-flight axial and radial ejection staple diagram c trap orbitrap collision cell quadrupole apci api esi