Chromatogram polynuclear aromatic hydrocarbons

An example of the application of this procedure to a complex chromatogram is shown in Figure 6.13 [34]. The sample is a mixture of polynuclear aromatic hydrocarbons from river sediments fractionated by capillary gas chromatography in the laboratory of Dr. M. L. Lee [40]. A count of peak maxima yields p = 145. Component numbers estimated from the slope and intercept give m = 234 and 267, respectively, yielding an average estimate of m = 250 for the number of components, which exceeds the number of peaks... 

While most columns are general-purpose, a number of columns are marketed for specific applications. Examples are columns for environmental analysis (carbamates, polynuclear aromatic hydrocarbons) or food testing (amino acids, organic acids, sugars). These columns are often shipped with chromatograms demonstrating the performance of the specific application. More examples of specific applications and GPC columns for polymer characterization are described in Chapter 7. 

Figure 2, Chromatogram of polynuclear aromatic hydrocarbon standards. Column fused-silica capillary (0.2 mm i.d.,...

On the monomeric LCSP called 4,4 -biphenylene-bis (4-n-butyloxy-benzoate) placed in a capillary column, 12 polynuclear aromatic hydrocarbon (PAHs) were separated in the mixture derived from coal tar (Fig. 4). The chromatogram of selected PAHs on metallomesogen stationary phase is presented in Fig. 5. Chromatograms of selected volatile aromatics compounds on monomeric stationary phases are presented in Figs. 6 and 7. 

FIGURE 4-4. Two approaches to the separation of polynuclear aromatics, (a) Reverse-phase separation of isomeric 4-ring polynuclear aromatics using a gradient of 70/30 (v/v) to 100/0 (v/v) acetonitrile/water as shown beneath the chromatogram. Column C,g detection at 254 nm. (b) Normal-phase separation of aromatic hydrocarbons. Column /uPorasil (silica, 10 /urn) 3.9 mm ID x 30 cm (2 columns) mobile phase hexane flow rate 8 mL/min. (Fig. 4-4b reproduced from reference 1 with permission.)... 

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