Determination of dissolved methane in the Beijing-Hangzhou Grand Canal using automated head space-GC system
A new head-space gas chromatography system equipped with a flame ionization detector and method was self-assembled and established,which could automatically and simultaneously measure concentrations of dissolved methane and carbon dioxide in water samples,with wider linear range and low operating cost.Precision and accuracy of this system for CH4 were better than 0.16%and 0.02%,respectively,which met the measurement requirements.In August 2022,dissolved CH4 concentration and related parameters were observed in the Beijing-Hangzhou Grand Canal in Hangzhou City.Results showed that mean dissolved CH4 concentration was(642.4±423.3)nmol/L,mean saturation was(22310±14701)%and mean air-water CH4 flux was(548.57±603.70)μmol/(m2·d)during field survey,indicated the observed area was a net source of atmospheric CH4.In addition,it was reasonable to estimate that the mean daily release rate of CH4 from the Canal was approximate 1710mol,which was equivalent to 38.31m3 of natural gas or 82.94kg of carbon.
head spacegas chromatographBeijing-Hangzhou Grand Canalmethaneflux
万方数据
维普
