• British Pharmacopoeia Volume IV
  • Appendices
  • Appendix I A. General Reagents

Argon
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Argon Ar  =  39.95 (7440-37-1)

Laboratory cylinder grade of commerce containing not less than 99.995% v/v of Ar.

When used in the test for Carbon monoxide in medicinal gases (Appendix IX E), after passage of 10 litres at a flow rate of 4 litres per hour, not more than 0.05  ml of 0.002m sodium thiosulphate VS is required for the titration (0.6  ppm).