Abstract
Two simple procedures for preparation of homogeneous 14CO2 samples for liquid scintillation counting are described. In one procedure (A), the carbon dioxide absorbing agent and the carbonate solution are placed in one tube. Carbon dioxide is released from the carbonate solution by sulfuric acid and absorbed by phenethyl-amine directly. Added NaH14CO3 (16–8000 dpm/ml.) is recovered nearly quantitatively in the amine phase. Similar results are obtained with another procedure (B), with which 14CO2 is released from the carbonate solution and flushed with nitrogen into a counting vial containing absolute methanol and phenethylamine.
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