Recently, the nitrous oxide isotope observation system of Southwest University has passed the acceptance inspection. The system is mainly used to measure the nitrous oxide concentration and isotope values of gas samples collected in the field and environmental gases. The system is composed ofAerodyneHigh time resolution trace gas and isotope analyzer, gas multi-channel sampling controller, andiChamberComposition of measurement room. This system is capable of real-time, fast, accurate, and online continuous measurement of nitrous oxide gas and isotope concentration in the ambient atmosphere, and can also be conveniently used for measuring gas samples in gas collection bags. The measurement principle is based on tunable mid infrared laser direct absorption spectroscopy technology, with a sampling frequency of up to10 Hz.

The system adopts210The meter cavity effectively improves the sensitivity and accuracy of measurement.

built-inIgor ProProfessional software that provides literature level data processing and analysis. The software has multiple functions such as data download, error analysis, leakage analysis, curve analysis, and data transfer.

System measurementN₂OGas andisotopeHaving a very highAccuracy:

The actual measurement results meet the measurement indicators:

N₂OGas measurement accuracy28.99ppt（1s）,7.96ppt（100s）

δ¹⁴N¹⁵N¹⁶Omeasurement accuracy2.21‰（1s）, 0.15‰（100s）

δ¹⁴N¹⁴N¹⁸Omeasurement accuracy3.86‰（1s）, 0.63‰（100s）