摘要
In this work, a highly sensitive solid-phase-dispersive microextraction method was designed based on magnetic carbon nanocomposites as a magnetic solid-phase extraction sorbent coupled with dispersive liquid-liquid microextraction and two miscible stripping solvents (MSPE-DLLME) followed by gas chromatography-mass spectrometry (GC-MS) for determination of 16 polycyclic aromatic hydrocarbons (PAHs). By adopting this research methodology, a mixture of two miscible organic solvents is used not only as stripping solvent for MSPE, but also as extraction and disperser solvents for DLLME procedure. Several parameters such as amount of extraction adsorbent, type of stripping, extraction solvents and their volumes, salt effect, and pH and volume of sample solution were optimized to obtain high extraction recoveries. Finally, 2 A mu L of extraction phase was injected into GC-MS. Under optimal conditions, the method attained satisfactory precisions (RSD% ae
- 出版日期2018-3