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    Evaluation of headspace equilibration methods for quantifying greenhouse gases in groundwater

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    Jahangir et al postprint_JEMA.pdf
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    Author
    Jahangir, Mohammad M. R.
    Johnston, Paul
    Khalil, Mohammed I.
    Grant, Jim
    Somers, Cathal
    Richards, Karl G.
    Keyword
    Greenhouse gas
    Headspace extraction
    Dissolved gases
    Shaking time
    Standing time
    Date
    23/08/2012
    
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    URI
    http://hdl.handle.net/11019/413
    Citation
    Jahangir, M. M. R.; Johnston, P.; Khalil, M. I.; Grant, J.; Somers, C.; Richards, K. G. Evaluation of headspace equilibration methods for quantifying greenhouse gases in groundwater. Journal of Environmental Management, 2012, 111, 208-212. DOI: 10.1016/j.jenvman.2012.06.033
    Abstract
    The objective of the study was to evaluate the different headspace equilibration methods for the quantification of dissolved greenhouse gases in groundwater. Groundwater samples were collected from wells with contrasting hydrogeochemical properties and degassed using the headspace equilibration method. One hundred samples from each well were randomly selected, treatments were applied and headspace gases analysed by gas chromatography. Headspace equilibration treatments varied helium (He):water ratio, shaking time and standing time. Mean groundwater N2O, CO2 and CH4 concentrations were 0.024 mg N L−1, 13.71 mg C L−1 and 1.63 μg C L−1, respectively. All treatments were found to significantly influence dissolved gas concentrations. Considerable differences in the optimal He:water ratio and standing time were observed between the three gases. For N2O, CO2 and CH4 the optimum operating points for He:water ratio was 4.4:1, 3:1 and 3.4:1; shaking time was 13, 12 and 13 min; and standing time was 63, 17 and 108 min, respectively. The headspace equilibration method needs to be harmonised to ensure comparability between studies. The experiment reveals that He:water ratio 3:1 and shaking time 13 min give better estimation of dissolved gases than any lower or higher ratios and shaking times. The standing time 63, 17 and 108 min should be applied for N2O, CO2 and CH4, respectively.
    Funder
    Department of Agriculture, Food and the Marine, Ireland; Department of Civil, Structural and Environmental Engineering, Trinity College Dublin
    Grant Number
    RSF 06383
    ae974a485f413a2113503eed53cd6c53
    http://dx.doi.org/10.1016/j.jenvman.2012.06.033
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    Environment, Soils & Land Use
    Environment, Soils & Land Use
    Environment, Soils & Land Use

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