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Figure 10. Reversed-phase HPLC analysis of PAHs extracted from SRM 1649, urban dust/organics, with UV detection, preceded by normal-phase HPLC fractionation based on ring carbon number. (Reprinted from reference 72. Copyright 1984 American Chemical Society.) Continued on next page.

Solution The relevant output from the AIM facility is given on the next page (note that the three portions we have extracted are from separate sections of the AIM output). We are interested in attractors—atoms—numbers 1, 3 and 4, which are the carbon atoms. The AIM method places the positive charge near the hydrogen atoms, while the carbon atoms have very little excess positive charge (although there is slightly more on the central carbon). 

The removal of the O atom from the 0 ion leaves behind two electrons that need a home. We can imagine them flooding onto the Fe ions that still cluster round the 0" ions, even in the fluid (Figure 4.4 on the next page). It is easy to do the arithmetic for every three O atoms extracted by CO molecules... 

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