For precise measurement of the concentration of nitrous oxide (N2O), methane (CH4), carbon dioxide (CO2), ammonia (NH3) and water (H2O).

Measurement of all gases using cavity ring-down spectroscopy, for excellent quantification of rise rates even under field conditions. The field-proven robust platform measures gas fluxes under soil hoods, in mesocosms, or during background measurements in urban areas or near agricultural sources. Direct field measurement provides data with high temporal resolution and eliminates additional sources of error when transporting samples to the laboratory.

Advantages:

• Measurement at remote sites with minimal maintenance and calibration.
• Simultaneous and continuous measurement of N2O, CH4, CO2, NH3 and H2O
• Sensitivity in the billionths range for excellent rate-of-rise quantification
• Fast response time and continuous measurements provide data with high temporal resolution
• Operates in open or closed systems and integrates easily with hood systems

Measurement accuracy at 5 minutes measurement time:

N2O: < 5 ppb

CH4: < 5 ppb

CO2: < 200 ppb

NH3: < 1 ppb

H2O: < 100 ppm  

Advantages of CRDS technology:  

(Source: Zaman et al. () Chapt. 2.7.1:  

"CRDS analyzers have three major advantages for measuring soil gas fluxes compared to conventional GC measurements:  

(1) They allow detection and measurement of low levels of GHG fluxes. Areas with low emission rates, while not significant in the short term, can be of great interest for calculating the global GHG budget when extrapolated over time and large areas; (2) Measurements of multiple species allow direct correlations between gas species. The processes and sources associated with GHG emission (or uptake) may require more than one axis for adequate; and (3) the high sampling frequency of real-time measurements leads to better characterization of soil flux profiles and shorter closure times for soil flux chambers. In addition, the real-time nature of this system provides immediate feedback on site selection and avoids sampling and storage effects."

Datenblatt Picarro G2508