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CARBON DIOXIDE FIXATIONof oxygen isotopes the acetate was converted to ethylene. 'The masses dealt with therefore were as follows: C13H3. CYOOH 3 H#P==C~3Hz, mass = 30 C'2H3. C'300H and -+ HzCP2=CPHz, mass = 29 CPH3. CP00H + H2U'J=CPHz, mass = 28 It should be possible with the mass spectrometer to determine the respective amounts of doubly, singly, and unlabeled ethylene in an ethylene sample, and hence the relative amount of the corresponding species of acetate from the fermentation. I. Procedure for Mass Analy. sis of C13-Ethylene Preparation of Ethylene -Doubly labeled ethylene was prepared from BaC03 containing 24. 5 per cent Cl3 by using the following series of reactions. BaC*O Mg 3 hex BaC2* y C*Hz. C*HO -K&rzO< C*H, C*OOH C&COCl 3 2 C*Hz. C*OCl ___ LiAIHL C*H C
Wood et al. (Fri,) studied this question.