heinemann chemistry 2 (4th edition) isbn 978 1 74081 6564heinemann chemistry 2 © harcourt...

Heinemann Chemistry 2 (4th edition)

ISBN 978 1 74081 6564Heinemann Chemistry 2 © Harcourt Education, a division of Pearson Australia Group Pty Ltd 2007

Figure 6.2 Thin-layer chromatography of three different food colours (A, B and C). A number of chemicals once used as food colours are now regarded as hazardous and can be detected by this method.



Figure 6.3 Calculation of the Rf

values of components on a chromatogram.



Figure 6.4 Chromatogram for Question 1.



Table 6.2 Rf values of some plant materials.



Figure 6.5 Using column chromatography to separatethe components in a mixture.



Figure 6.6The constructionof a high performance liquid chromatograph.



Figure 6.9 A gas chromatograph.



Figure 6.10 Section through a GLC column.



Figure 6.11 Gas chromatogram of a petrol sample.



Figure 6.12 Chromatogram of a reference sample containing a mixtureof butane, 2-methylbutane, hexane, benzene and 2-methylhexane.



Figure 6.13 Petrol sample spiked with benzene.



Figure 6.14 Chromatogram of standard samples of benzene and an unknown sample.



Figure 6.15 Calibration graph for benzene in petrol.



Table 6.4 Rf values

of some amino acids.



Figure 6.17 Chromatogram using Solvent 1.



Figure 6.18 Chromatogram using solvent 2.



Figure 6.19 Solvent fronts: amino acids.



Figure 6.20 Chromatograms produced for suspected contaminated water sample and parathion standards.



Figure 6.21 Chromatogram of four hydrocarbons.



Figure 6.22 Chromatogram of herbal tea extract.



Table (Q20) Results for nitroglycerine standards and sample.

heinemann chemistry 2 (4th edition) isbn 978 1 74081 6564heinemann chemistry 2 © harcourt...

Documents

heinemann chemistry

harcourt education

th edition isbn

gas chromatogram

petrol sample

r f values of components

reference sample

unknown sample