A Headspace Equilibration Technique for Measurement of Dissolved Gases in Sediment Pore Water

Abstract
Multiphase headspace equilibration with gas chromatographic analysis was used for the simultaneous analysis of CH4, and N2 in Lake Erie sediment pore water, with total CO2 concentrations determined on a separate duplicate sediment sample. The minimum detectable concentrations of Ar, N2, CO2, and CH4 in a Lake Erie sediment were 1.55, 0.96, 2.50, and 1.01 ml/L, respectively, using a thermal conductivity detector. Precision of the dissolved gas analysis ranged from ±0.24 to ±0.41 ml/L.