Detection of traces of oxygen in gases: methylene blue method.
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Australian Atomic Energy Commission
Abstract
A simple method for the detection of traces of oxygen in gas streams is described. The method is based on the colour change which occurs when leuco-methylene blue is oxidised to methylene blue. Suggested uses of the method are in argon-arc welding and glove-box work where oxygen must be excluded.
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Davis, P. S. (1958). Detection of traces of oxygen in gases: methylene blue method (AAEC/E21). Lucas Heights, NSW: Australian Atomic Energy Commission.