Measurement of methane and nitric oxide (I) emissions by gas chromatography using planar microfluidic systems
Abstract
The work proposes the use of microfluidic chromatographic systems to assess greenhouse gas emissions (methane CH4 and nitrogen oxide (I) N2O). The testing of the proposed gas chromatograph solution was carried out on agricultural fields when applying mineral fertilizers. The gas chromatographic method was used to study the emission of CH4 and N2O in 3 test agricultural plots using planar microfluidic systems. The maximum increase in the total N2O emission over the entire study period was observed in plots with fertilizer application (Neo N 46 (1) after disking and after sowing) and amounted to 0.084 and 0.072 mg/m2×hour compared to the control field without fertilizer application (0.061 mg/ m2×hour). The maximum methane emission was also observed when Neo N 46 fertilizer (1) was applied under disking and amounted to 1.720 mg/m2×hour. This is due to the prolonged effect of nitrogen nutrition from applying fertilizer with a urease inhibitor. It has been shown that the developed analytical systems based on planar microfluidic gas chromatography can be successfully used for direct gas chromatographic measurement of CH4 and N2O emissions without the use of additional components of the chromatographic system, which helps to simplify the analytical complex and reduce analysis time.
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