Optimization of a novel method for determination of benzene, toluene, ethylbenzene, and xylenes in hair and waste water samples by carbon nanotubes reinforced sol–gel based hollow fiber solid phase microextraction and gas chromatography using factorial experimental design

Direct synthesis of nitrogen-doped graphene on platinum wire as a new fiber coating method for the solid-phase microextraction of BXes in water samples: Comparison of headspace and cold-fiber headspace modes

“…The injector and detector temperatures were set to 200ºC and 300ºC, respectively. The injection was undertaken in split mode with split ratios of 1:10 and 1:20 for the first 2 min and the remaining run time, respectively due to avoid of overlap or flatting of some peaks and prevent of probably leakage which may be new fiber has [12,[33][34][35]. Nitrogen (>99.999%) at a constant pressure of 4 psi was used as the carrier gas.…”

Orthogonal array design for optimization of hollow-fiber-based liquid-phase microextraction combined with high-performance liquid chromatography for study of the pharmacokinetics of magnoflorine in rat plasma

“…Blood samples were collected from the ocular vein in clean heparinized glass tubes before (0 h) and 0.033, 0.083, 0.17, 0.25, 0.5, 0.75, 1,2,4,6,8,9,12,24, and 36 h after dosing. The samples were then centrifuged and the separated plasma was processed as described above.…”

“…The application of OAD can simplify the experimental procedure without affecting the quality of results. Adopted as a chemometric method, OAD has been widely used for the optimization of analytical procedures in recent years [20][21][22][23][24].…”

Fiber-based solid phase microextraction using fused silica lined bottles to collect, store, and stabilize a multianalyte headspace gas sample for offline analyses

“…In situ fiber solid phase microextraction [1] (SPME) is a mature quantitative sampling technique that enables trace-level multianalyte detection for a wide range of sample matrices [2][3][4][5] and environmental conditions [6][7][8][9]. In fiber SPME, a syringe-like device houses a retractable fused silica fiber with an immobilized stationary extraction phase at its tip, which is inserted into the sample headspace or liquid to collect and concentrate analytes via absorption and/or adsorption, until ideally equilibrium is achieved.…”