The efficiency of the method of de‐aerating aqueous solutions devised by Hersch has been examined. The method is more convenient and efficient than those in current use, because within 1 h. the residual oxygen content of a solution can be reduced either to 0.003 ± 0.001 p.p.m. by weight by use of ‘White Spot’ nitrogen (less than 10 p.p.m. of oxygen) as the scrubbing gas, or 0.0005 p.p.m. when purifited nitrogen is used.
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Gilroy et al. (1962) studied this question.
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