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

Oxygen
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Oxygen O2  =  32.00 (7782-44-7)

General reagent grade of commerce containing not less than 99.99% v/v of oxygen.

Nitrogen and argon Less than 100 ppm.

Carbon dioxide Less than 10 ppm.

Carbon monoxide Less than 5 ppm.