Sigma-Aldrich Oxygen-18O2. 99 atom % 18O, 99% (CP). 1 L

Oxygen-¹⁸O₂ is a naturally occurring stable isotope of oxygen. Natural abundance of ¹⁸O₂ containing at least 99 atom % O-18.

¹⁸O₂ isotopic labelling was employed, in conjunction with time-of-flight secondary ion mass spectrometry, to characterize and elucidate the parts of the degradation mechanisms induced by molecular oxygen. Using ¹⁸O₂ as a label, it is possible to study collagen degradation with this non-reutilized label and SO avoid the large errors that are introduced by the recycling of other labels.

Oxygen-¹⁸O₂ can be used to study the kinetic and functional analyses in photosynthesis research. It is used to estimate the role of oxygen in the vitamin-K dependent carboxylation reaction. Also used to measure the amount of oxygen produced by the etching a Quartz tube with SF₆ plasma.

1 L quantity is packaged in a 450 mL carbon steel lecture bottle with brass CGA 110/180 valve. Nominal gas pressure at 21ºC is 20 psig for 1 L. This pressure is slightly above atmospheric pressure. Care must be taken when extracting this product from the cylinder.

All gas volumes are quoted at Standard Temperature and Pressure (STP) and not at Normal Temperature and Pressure (NTP). One STP Liter is 7.7% more gas than one NTP Liter.

Brass hose adapter Z146811 or brass body mini gas regulator Z513539 is recommended for 500 mL Sure/Pac cylinder (U.S only). For 1 L cylinder, either stainless steel control valve Z146951 or Z187224 is recommended.
PTFE sealing washers GCA inlet size 180 Z146994
PTFE sealing washers CGA inlet size 110 Z146986