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1 September 2018 Comparison between a Photo-Acoustic Analyzer System (PAS) and Gas Chromatograph (GC) for Measuring CO2 and N2O Emissions in a Corn/Soybean Field
Dipti Rai, Nsalambi V. Nkongolo
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Abstract

There is a need to compare greenhouse gases (GHGs) measurements methods for data harmonization. The objective of this study was to compare Gas Chromatography (GC) and a Photo-Acoustic Analyzer System (PAS) as methods for measuring carbon dioxide (CO2) and nitrous oxide (N2O) emissions in a corn/soybean field. The study was conducted on a Waldron silt loam soil at Freeman farm of Lincoln University of Missouri. Sixteen cylindrical polyvinylchloride static chambers measuring 0.30 m in height and 0.20 m in diameter were permanently inserted into the soil to a depth of 0.05 m for GHGs measurements. Soil air samples were collected in each chamber with a 60 ml syringe and stored in a Tedlar bag for CO2 and N2O analysis by GC within 2 hours of sampling. CO2 and N2O measurements with PAS were done directly in-situ. Significant, stronger and positive correlations were found between PAS and GC in 11 out of 15 months - measurement cycles for CO2. The most significant correlation was observed in April 2015 (r = 0.90, p = 0.0001). For N2O, however, only 5 out of 15 measurements between PAS and GC had positive, but weak correlations. The highest correlation between PAS and GC measurements for N2O was also found in April 2015 (r = 0.71, p = 0.0020). Continuous monitoring of GHGs emissions is necessary to better understand their dynamics and how they are exacerbated by agricultural management practices. However, accurate measurement techniques are also needed.

Dipti Rai and Nsalambi V. Nkongolo "Comparison between a Photo-Acoustic Analyzer System (PAS) and Gas Chromatograph (GC) for Measuring CO2 and N2O Emissions in a Corn/Soybean Field," Transactions of the Kansas Academy of Science 121(3-4), 351-360, (1 September 2018). https://doi.org/10.1660/062.121.0405
Published: 1 September 2018
JOURNAL ARTICLE
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KEYWORDS
carbon dioxide
gas chromatography
nitrous oxide
photoacoustic analyzer
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