
Sol–gel methyl coating in capillary microextraction hyphenated on-line with high-performance liquid chromatography: Counterintuitive extraction behavior for polar analytes
Keywords: فنول; Sample preconcentration; Sol–gel methyl coating; In-tube SPME; Capillary microextraction (CME); High-performance liquid chromatography (HPLC); On-line coupling; CME-HPLC; Polycyclic aromatic hydrocarbons (PAHs); Ketones; Phenols; Alcohols; Amines