Supplemental tests of gas trapping device for N2 flux measurement
Author(s)
Liu, Xinhong
Gao, Yan
Zhao, Yongqiang
Wang, Yan
Yi, Neng
Zhang, Zhenhua
Yan, Shaohua
Griffith University Author(s)
Year published
2016
Metadata
Show full item recordAbstract
The gas trapping device method (GTD) is a relatively new method to measure N2 flux from waters. However, the non-equilibrium diffusion error and the reliability of GTD method compared to other previously established N2 flux measurement methods has not been evaluated. In this study, the diffusive error of GTD, coming from non-equilibrium N2 partial pressure between the headspace inside the gas sample bottle and the air, was estimated using a sterilization experiment. Moreover, the GTD and MIMS methods were compared for measuring N2 flux from water under similar conditions. The results showed that there were maximum diffusion ...
View more >The gas trapping device method (GTD) is a relatively new method to measure N2 flux from waters. However, the non-equilibrium diffusion error and the reliability of GTD method compared to other previously established N2 flux measurement methods has not been evaluated. In this study, the diffusive error of GTD, coming from non-equilibrium N2 partial pressure between the headspace inside the gas sample bottle and the air, was estimated using a sterilization experiment. Moreover, the GTD and MIMS methods were compared for measuring N2 flux from water under similar conditions. The results showed that there were maximum diffusion errors of 2.99% in the sample bottles prefilled with pure Helium, while only 1.09–1.76% diffusion errors in bottles prefilled with other N2 standard gas (15% or 75%), indicating minor non-equilibrium diffusion errors. N2 fluxes from water measured by GTD and MIMS methods are quite similar under all three concentrations of nitrate (5.30, 10.55 and 17.25 mg L−1) and two levels of temperature (20 and 30 °C). Therefore, the GTD method offers a reliable alternative method to estimate N2 flux rate in aquatic ecosystem.
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View more >The gas trapping device method (GTD) is a relatively new method to measure N2 flux from waters. However, the non-equilibrium diffusion error and the reliability of GTD method compared to other previously established N2 flux measurement methods has not been evaluated. In this study, the diffusive error of GTD, coming from non-equilibrium N2 partial pressure between the headspace inside the gas sample bottle and the air, was estimated using a sterilization experiment. Moreover, the GTD and MIMS methods were compared for measuring N2 flux from water under similar conditions. The results showed that there were maximum diffusion errors of 2.99% in the sample bottles prefilled with pure Helium, while only 1.09–1.76% diffusion errors in bottles prefilled with other N2 standard gas (15% or 75%), indicating minor non-equilibrium diffusion errors. N2 fluxes from water measured by GTD and MIMS methods are quite similar under all three concentrations of nitrate (5.30, 10.55 and 17.25 mg L−1) and two levels of temperature (20 and 30 °C). Therefore, the GTD method offers a reliable alternative method to estimate N2 flux rate in aquatic ecosystem.
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Journal Title
Ecological Engineering
Volume
93
Subject
Environmental Science and Management not elsewhere classified
Earth Sciences
Environmental Sciences
Engineering