Nitrous Oxide (N2O) concentration analysis of gas samples.
- N2O concentration should be between 0.1 to 10 ppm. If the sample has more than 10 ppm N2O, it must be diluted before analysis.
- We need to inject a minimum of 3 mL into the GC.
- Samples in serum bottles should be over-pressured by at least 3 mL. If samples are at atmospheric pressure, then add UHP N2 to the bottle before removing 3 mL sample gas for analysis. Concentration data will need to be corrected to account for this dilution.
Samples are analyzed using our Green House Gas Analyzer (Shimadzu). A gas tight syringe is used to withdraw 3 mL gas sample from the over pressured sample vial and injected into the GC inlet. Gas standards that cover the sample concentration range are prepared in-house by mixing pure N2O with N2. Sample N2O concentration is calculated by using regression analyses (concentration vs peak response) of the standard data.