Oxygen

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Oxygen

Oxygen

The sampling of gases for subsequent trace oxygen determination is not straightforward. Whilst in theory quantification of oxygen at single 1 µL/L (ppm v/v) concentrations should be possible, in practice accurate, on-site measurements below 100 µL/L are difficult to achieve with “off the shelf” instrumentation due to system leaks and ingress of atmospheric oxygen (21% v/v) into the analyser.

It is therefore essential that the determination of trace oxygen in gas is carried out at-line with a sampling and analysis system that has been proven to overcome ingress of air issues.

Mercury

Qa³ have developed a sampling apparatus and analysis protocol designed to (i) prevent contamination from atmospheric oxygen (ii) reduce equilibration time and (iii) achieve an LOQ for oxygen that is commensurate with the specifications imposed by many pipeline operators, which are typically ~10 µL/L. The methodology is in accordance with ASTM D7607 – 11 and offers a limit of detection (LOD) of 0.3 ppm v/v and a limit of quantification (LOQ) of 1.0 ppm v/v.

Key Features

  • A limit of detection 0.3 ppm v/v and a limit of quantification of 1.0 ppm v/v
  • No interference from the presence of CO₂ at concentrations ≤ 10% v/v
  • No interference from the presence of H₂S at concentrations ≤ 100 ppm v/v
  • Method approved for CATS pipeline entrants
  • LPG module available on request
  • Quality Control standards used to verify calibration on site
  • ATEX certification by Baseefa and Ɛx certification by ISSeP
 

Want to know more about our oxygen in gas services?

For further information on our bespoke system and how we can determine oxygen in gas down to < 1 ppm.

Companies we work with...

ConocoPhillips
Total
JM
BP
Axans
Petrofac
PTT Global Chemical
Nalco
Sonatrach
Shell
Coastal Energy
Salpem
Schlumberger
Inpex
Chevron
Repsol
BG Group
Premier Oil
Sabah
Ineos
Hellenic Petroleum