560 



Annals New York Academy of Sciences 



Electric 12-in. mass spectrometer that is modified for high mass analyses. 

 Operating conditions of the General Electric instrument were: ionization 

 potential, 31 volts (benzene and methanol eluates of 2-Murray were run also 

 at 12 volts); ionization current, 50 yuamp.; accelerating potential, 2500 volts; 

 scan rate, magnet current 50 to 500 mamp. in 20 minutes; temperatures, sample 

 evaporator 255° to 262° C, volume 233° to 240° C, inlet lines 213° to 217° C, 

 ionization chamber 174° to 177° C. 



o 

 < 



OD 



tr 

 o 

 to 



CD 

 < 



, \.\ I -•■n-HEPTANE 



\ 1/ ll \ • • -CARBON-TET. 



I l|i V- -BENZENE 



' \) ' I— METHANOL 



*O.OImg/ml lo.025 mg/ml \ 



\ I Vl 



I 10.2 mg/ml 



, U-V SOLVENT \ 

 \ -METHANOL \ 



\ \ 



"200 240 280 320 



MILLIMICRONS 



360 



400 



Figure 3. Ultraviolet spectra of the silica gel chromatographic fractions of 1-Orgueil 

 6-hour extract. Saturated hydrocarbons do not absori) in the ultraviolet range. Aromatic 

 hydrocarbons do absorb. These spectra indicate that w-heptane eluate is composed primarily 

 of saturated hydrocarbons and that the aromatics in the 1-Orgueil extract are concentrated 

 in the benzene eluate. 



< 



GD 



q: 

 O 

 en 



CD 



< 



200 



240 



280 320 



MILLIMICRONS 



360 



400 



Figure 4. Ultraviolet spectra of the silica gel chromatographic fractions of the 2-Murray 

 20-hour extract. Chromatographic fractions of the 2-Murray extract are similar in composi- 

 tion to those of 1-Orgueil extract, but the relative concentrations of the aromatic hydrocarbons 

 in these extracts vary in much the same manner as do the aromatic contents of different 

 terrestrial sediments. 



