Carbon black extract, capillary

Figure 3. SFC chromatogram of a carbon black extract. Conditions n-pentane mobile phase at 210°C 32 m x 75 pm i.d. fused silica capillary column coated with a 0.25- Jm film of crosslinked 50% phenyl methylphenylpolysiloxane, UV-absorption at 214 nm, asymptotic density program from 0.07 g/mL (26.7 atm) to 0.24 g/mL according to the equation 13 8...

Figure 1.17 Separation of large ring polycyclic aroaatic hydrocarbons extracted from carbon black on a 1.8 x 0.2 n I.D. fused silica capillary column packed with 3 micrometer spherical octadecylsllanized silica gel eluted with a stepwise solvent gradient at a flow rate of 1.1 mlcroliters/min with an inlet pressure of about 360 atmospheres. Under isocratic conditions this column yielded ca. 225,000 theoretical plates. (Reproduced with permission from ref. 238. Copyright Friedr. Vieweg t Sohn).

Figure 29 8 illustrates the separation of polycyclic aromatic hydrocarbons extracted from a carbon black, Detection was by fluorescence excited at two differeni wavelengths. Note the selectivity provided by this technique, The chromatogram was obtained b> using a 40 m X. SO pm inside-diameter capillary coated with a 0,25-pm film of S0% phenylpolysiloxane. The mobile phase was pentane at 2l(rc. and the following pro-gram was used initial mobile-phase density held at... 

Solid-phase extraction (SPE) has been used in conjunction with separation techniques [gas chromatography (GC), liquid chromatography (LC), and capillary electrophoresis (CE)] for environmental analysis. Recent developments in both SPE and solid-phase microextraction (SPME) have been reviewed. Some of the solid phases investigated previously include graphitized carbon black, octadecylsilica, and Ci8 cartridges. Comparisons of the sorbent materials available for the extraction of phenols have been carried out in conjunction with chromatographic separations. A comparison of polycrystalline graphites and SPME fibers [poly (dimethyl... 

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