Gram-Schmidt chromatograms

Figure 7.27 Constructed Gram-Schmidt chromatogram of a temperature-programmed packed-capillary LC separation of 4.8 ig Irgafos P-EPQ dissolved in DMF temperature programme 50°C for 8min, 4°Cmin-1 up to 140°C. Legend 1, mono-P-EPQ 2, Irgafos 168 3, 4,3 -P-EPQ 4, oxidised 4,4 -P-EPQ 5, 4,4 -P-EPQ. After Bruheim et al. [511]. From I. Bruheim et al., Journal of High Resolution Chromatography, 23, 525-530 (2000). Wiley-VCH, 2000. Reproduced by permission of Wiley-VCH.

Figure 18 (a) GC-FTIR Gram-Schmidt chromatograms from evolved gases from PHB at... 

Gram, Christian, 77 7 Gram-Schmidt chromatogram, 74 233 Grand canonical ensemble, 7 33 Grand Composite Curve (GCC), 73 221, 20 737-738... 

In GC/FTIR, the chromatogram representing the absorbance of each scanset versus retention time is called the Gram-Schmidt chromatogram (GSC). The GSC resembles the total ion chromatogram (UC) in MS and a flame-ionization detector (FID) chromatogram. It is not a simple sum of all... 

Figure 3. Chromatograms of an extract of a rubber sample containing two mustard agents (peaks marked with 2 and 3) (a) Gram-Schmidt chromatogram and (b) functional group chromatogram 750-680 cm-1 (Reproduced by Permission of the Finnish Ministry for Foreign Affairs from International Interlaboratory Comparison (Round-Robin) Test for the Verification of the Chemical Disarmament, F.3. Testing of Procedures on Simulated Industry Samples, The Ministry for Foreign Affairs of Finland, Helsinki, Finland, 1992, ref. 18)...

Gram-Schmidt chromatograms are created from the interferogram intensities and reflect the infrared absorption. The Gram-Schmidt traces are plots of infrared absorbance versus time. The absorbance spectra of the eluted species are calculated by performing a Fourier transformation on the interferogram. 

Figure 7.14 GC-FTIR analysis of petrol using a 25 m x 0.25 mm BP-1 capillary column (a) Gram-Schmidt chromatogram (b) stack plot. (Reproduced by permission of Perkin...

The nature of this technique requires that interferograms are collected over short time intervals. Data can be displayed in real time and are commonly monitored as the changing spectrum of the GC effluent and the changing infrared absorption as a function of time. The latter is known as a Gram-Schmidt chromatogram. 

Figure 18 TLC-FTIR window chromatogram (A and B, dashed line) and Gram-Schmidt chromatogram (B, dotted line) of an analgesic containing paracetamol, phenazone, and caffeine.

Rgure 24 HPTLC-FTIR Gram-Schmidt chromatogram from peppermint oil (A) and from a mixure of its ingredients (B) menthol 1.8 min. carvone 2.8 min, menthone 4.0 min, and menihylacetate 5.0 min. 

Gram-Schmidt chromatogram— a nonselective summation of total intensity from a spectral scan per unit time which resembles in profile a flame ionization detector chromatogram. 

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