Characterization and Application of an Online Measurement System for NO3 and N2O5 Based on Cavity Ring-Down Spectroscopy
This study presents a home-made online measurement system for atmospheric NO3/N2O5 based on cavity ring-down spectroscopy and its characterization results.The system achieves a detection limit of 1.7×10-12 for NO3 and 2.9×10-12 for N2O5 at a time resolution of 1 minute.Under sampling conditions of 6 L/min flow rate and a filter membrane used for 1 day,the sampling loss for NO3 and N2O5 is determined to be 17.0%and 18.0%,respectively.Allan variance analysis indicates an optimal system stability at integration times between 60 and 100 seconds.Field measurements of NO3 and N2O5 were conducted in the urban area of Beijing,and the results demonstrate that the measurement system can achieve high-sensitivity measurements of NO3 and N2O5 under atmospheric environment.
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