Download Food and Environmental Analysis by Capillary Gas by Lothar Matter PDF

By Lothar Matter

According to a few conferences held by means of the German Chemical Society, presents sensible suggestion for analysts and technicians who're now not now or ever intend to be specialists at the approach yet use it since it works. Covers utilizing the foundations of chromatography to capillary gasoline chromatography, picking out residues and contaminants, deciding upon polycyclic fragrant hydrocarbons in nutrients, and the mass-spectrometer as a detector within the method. Translated from released by means of VCH Verlagsgesellschaft in 1994.

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Additional info for Food and Environmental Analysis by Capillary Gas Chromatography

Sample text

Recognition of such interrelationships, however, requires familiarity with analytical methods and background knowledge (acquired by reading the "right" literature). Figure 1-24 shows a TIC chromatogram of the analysis of PAH in soil samples. Alongside traces of PAH compounds, a compound/class of compounds is seen to be present which exhibits heading (gradual rise of peak). The same phenomenon is seen in the analysis of PCBs in sewage sludges (by ECD detection). In both cases we are dealing with molecular sulfur S8, which can serve the analyst as an indicator of the use of sewage sludge [ 1-32].

Figure 2-1 1 (see p. 43) shows the confirmation of a positive acepromazine finding in pork. The upper chromatogram is the total ion current recorded with the aid of electron impact ionization. The peak marked with a " 1" is unequivocally due to acepromazine, as follows from comparison of the mass spectrum with that of the reference substance. There is also another peak in the total ion current chromatogram which was not shown by the preceding mass fragmentography because it does not contain any of the fragments selected for measurement.

3 Applications of GC/MS to the Analysis of Residues and Contaminants in Foods 33 Compared with conventional detectors, this approach yields not only the retention time but also important information about the presence of characteristic mass fragments, which greatly enhances the selectivity of the procedure and hence the reliability of the results. If mass fragmentography is used with chemical ionization a better signal-tonoise ratio is obtained than with electron impact ionization because the mass spectrometric signal is no longer distributed over numerous fragments but consists mainly of the molecular ion.

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