602892

Oxygen-¹⁸O₂

99 atom % ¹⁸O, 99% (CP)

• Linear Formula: ¹⁸O₂
• CAS Number: 32767-18-3
• Molecular Weight: 36.00
• MDL number: MFCD00084251
• PubChem Substance ID: 24881829
• NACRES: NA.12

Properties

• vapor density: 1.11 (vs air)
• Quality Level: 200
• isotopic purity: 99 atom % ¹⁸O
• assay: 99% (CP)
• form: gas
• technique(s): PET imaging: suitable
• bp: −183 °C (lit.)
• mp: −218 °C (lit.)
• mass shift: M+4
• SMILES string: [18O]=[18O]
• InChI: 1S/O2/c1-2/i1+2,2+2
• InChI key: MYMOFIZGZYHOMD-XPULMUKRSA-N

Description

General description

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

Application

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.

Packaging

500 mL in Sure-Pac™

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.

Recommended products

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

Safety Information

• Pictograms: GHS03,GHS04
• Signal Word: Danger
• Hazard Statements: H270 - H280
• Precautionary Statements: P220 - P244 - P370 + P376 - P410 + P403
• Hazard Classifications: Ox. Gas 1 - Press. Gas Compr. Gas
• Storage Class Code: 2A - Gases
• WGK: WGK 3
• Flash Point(F): Not applicable
• Flash Point(C): Not applicable
• Personal Protective Equipment: dust mask type N95 (US), Eyeshields, Gloves