Natural gas is colourless and odourless in its most pure form. When
extracted, it can contain sulfur compounds such as H2S and Mercaptans
that when in the presence of moisture can produce sulfuric acid that can
degrade the pipeline. So for reasons of public safety as well as
pipeline integrity, there is a need to measure and control precisely the
level of odorant species in natural gas :
- adjust the amount of sulfur molecules in the gas
- control of odorant passivation
- aids in detection of leaks
For more than 30 years, Chromatotec® has manufactured the
energyMEDOR, based on the gas chromatography principles, to measure H2S,
all mercaptans, sulfides, Tetrahydrothiophene (THT) and total sulfur in
natural gas. Due to the advantages of the “MEDOR” technology, a new
guideline was defined, ASTM D7493-08 (as the Standard Test Method for
Online Measurement of Sulfur Compounds in Natural Gas and Gaseous Fuels
by Gas Chromatograph and Electrochemical Detection). The energyMEDOR by
Chromatotec® is fully compliant with this guideline.
It has been established that organic aerosols (OA) makes up a major
fraction of fine particulate matter in all region of the atmosphere.
This fraction accounts approximately for half of the total PM2.5 dry
mass. Primary OA is directly emitted in the trophosphere from anthropological and natural sources whereas secondary OA (SOA) is formed in-situ in the atmosphere from the oxidation of biogenic or anthropogenic gas-phase precursors and subsequent partitioning of the less volatile products into the particle phase.
Authors : Jean Philippe AMIET, Louis VIVOLA
Odour measurement is a demanding topic to manage due to the complexity of existing solution and the methodology used.
Authors : Franck Amiet, Michel Robert, Dr Nicholas A Martin
Due to environmental issues, the world of gas analysis is evolving very rapidly. Governments set the rules to limit and control the environmental pollution through legislation. Volatile organic compounds (VOCs), often produced by human activities, are amongst the sources of pollution that
need to be identified and quantified for safety reasons. Exposure to high concentrations of certain VOCs is dangerous, even for short times, and the impact of low concentrations of VOCs on people’s health and environment has also become a major concern in recent years. The concentration of such compounds can be very different depending on the measurement area and it is a considerable technological challenge to analyse precisely and continuously the VOCs present in air within industrial walls or at the top of a mountain using the same instrument. Presently, only benzene is regulated, but there are moves to measure other VOCs which are known to be ozone precursors.