Oxygen and carbon dioxide analysers

In a number of surveys, Lovell (1979), Lovell and Hale (1983) and Lovell et al. (1979, 1983) used a Taylor Servomex DA272 oxygen analyser and a Lab-Line 2245 carbon dioxide analyser. These instruments were connected in series and samples of soil air from a probe driven about 1 m into the ground were introduced by means of a hand pump. 

A disadvantage of both instmments is that, in the field, repeated and tedious zeroing is necessary before and after each measurement in order to ensure the requisite precision. 

Magnetic susceptibilities of common gases at 100% concentration in sample, expressed in terms of oxygen equivalent 

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