Supplemental tests of gas trapping device for N-2 flux measurement

文献类型： 外文期刊

第一作者： Liu, Xinhong

作者： Liu, Xinhong;Gao, Yan;Wang, Yan;Yi, Neng;Zhang, Zhenhua;Yan, Shaohua;Zhao, Yongqiang

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关键词： Gas trapping device;N-2 flux measurement;Non-equilibrium diffusive error;Membrane inlet mass spectrometry method

期刊名称：ECOLOGICAL ENGINEERING （ 影响因子：4.035； 五年影响因子：4.611 ）

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收录情况： SCI

摘要： The gas trapping device method (GTD) is a relatively new method to measure N-2 flux from waters. However, the non-equilibrium diffusion error and the reliability of GTD method compared to other previously established N-2 flux measurement methods has not been evaluated. In this study, the diffusive error of GTD, coming from non-equilibrium N-2 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 N-2 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 N-2 standard gas (15% or 75%), indicating minor non-equilibrium diffusion errors. N-2 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 degrees C). Therefore, the GTD method offers a reliable alternative method to estimate N-2 flux rate in aquatic ecosystem. (C) 2016 Elsevier B.V. All rights reserved.

分类号： Q14`X171

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