LGR has launched an ultra-sensitive analyser that provides real-time, direct and automated measurement of carbonyl sulfide (COS) in ambient air samples with parts-per-trillion precision and at rates as fast as 10 Hz.

This new COS analyser also provides simultaneous measurements of carbon monoxide (CO), carbon dioxide (CO2) and water vapor (H2O) over a wide range of mole fractions, and without cross-sensitivity to other atmospheric species.

The new COS analyser does not require sample drying or any pre-treatment, which simplifies operation in the field, as well as in research and reference laboratories.

In addition, the field-proven reliability of LGR’s gas analysers, accessories and capabilities (including the Data Logging Software, Multiport Inlet Unit, and Ethernet/wireless connectivity), facilitate deployment in remote, unattended monitoring applications.

COS is an atmospheric gas that is gaining interest as a useful tracer to assess gross photosynthesis activity in plant canopies; plants uptake COS and CO2 during respiration, but only generate CO2 by photosynthesis. 

Simultaneous logging of the concentrations of both gas species thus enables net photosynthetic production to be monitored. 

Moreover, COS is the most abundant sulfur containing gas in the atmosphere and has been implicated in controlling the sulfur budget and aerosol loading of the stratosphere. 

Since COS is typically only present in air at about 500 parts per trillion (global average), extreme sensitivity is required, without cross-sensitivity with other atmospheric gases such as CO2, CH4 and H2O, which are typically present at much higher concentrations.

LGR precision gas analysers are based on the company’s patented Off-axis Integrated Cavity Output Spectroscopy (OA-ICOS) technology, a fourth generation, cavity-enhanced laser absorption technique. 

This unique approach is both more rugged and more precise than earlier cavity-enhanced techniques, such as conventional cavity ringdown spectroscopy (CRDS), because the performance of OA-ICOS does not need ultra-precise alignment or sub nanometer stability of its optics.

This ensures the highest absolute accuracy and linearity, longer maintenance intervals, higher reliability and significantly reduced cost of ownership.