Researchers in soil science are interested in rapid, accurate and reproducible greenhouse gas (GHG) flux monitoring methods in order to assess and compare various soil systems, either natural or farmed. Their works also serve as a basis for determination of best farming practices (in particular for fertilization) and future land management strategies. As they typically focus on carbon and nitrogen cycles, and on GHG emissions, researchers usually target CO2, CH4, N2O, and NH3.
Scientific teams are studying the emission rates of soil systems around the world, including in remote locations, and very often in rugged conditions. Beyond their need for high sensitivity with typical concentration levels barely higher than the ambient background, the quality of their results will strongly depend on high replication rate to account for the intrinsic heterogeneity of the soils.
It means that they have to deal with large number of measurements, sometimes in experimental fields far away from analytical labs. Hence they need cost-effective direct measurement solutions which can be easily deployed in the field, and of course with superior specifications.
The most widely used and least expensive method for measuring GHG fluxes in agricultural fields involves periodic gas sampling from static flux-chambers: the emission rate (or efflux) is derived from the concentration increase rate in the closed chamber volume.
Once pre-configured with the appropriate set of optical filters, the Photoacoustic Gas Monitor 1512 can be easily and rapidly deployed at the various flux chamber locations. It is typically integrated in a closed-loop system with a chamber and enables the parallel reading of up to 5 gas concentrations (+ water vapor).
Simple by design, the standalone instrument is extremely easy to use even by non-experts in gas analysis: all it takes is a start/stop button.
Measurement logs of extended research campaign are conveniently stored in the internal memory and can be easily analyzed using the user-friendly LumaSoft Application Software, then exported into spreadsheet format for further processing.
Leveraging the photoacoustic spectroscopy technique, the Innova 1512 differentiates significantly from the competition with a very low volume measurement cell. Consequently, a 1:1000 ratio is easily obtained between the cell volume and the static flux chamber for typical bucket-size (~ 10L) chambers. It helps minimizing the disturbances inside the chamber and possible artifacts on the readings.
When measuring with active cross-compensation (from IR spectroscopic interferences), the following detection limits can be obtained after proper filter configuration and instrument calibration.
Detection limits of typical gas of interest:
|Carbon dioxide||CO2||5 ppm|
|Nitrous oxide||N2O||0.03 ppm|
- Field deployable standalone monitor
- In-situ direct multi-gas monitoring
- Low volume gas sample cell
- Stable, Reliable, “zero” maintenance
- Scalability of measurement campaigns at high replication rate without extra cost (no carrier gas, no consumables)
It was already selected by multiple end-users worldwide who reported its use in a large variety of conditions over the planet: grasslands, wetlands, crop fields, rice paddies, etc.