Figure 4
From: Methane formation and consumption processes in Xiangxi Bay of the Three Gorges Reservoir
Experimental equipment layout.
(a) The whole experiment system consists of a big water tank with electric heater (1), micro-pump (2), small fans (4), temperature transducers (5) and electronic thermometers TP3001 (6), some three-way and connecting pipes. The environment water (3) in the tank was darkened by ink to shield sediments from light. Three 1.0 m long acrylic round tubes were signed A, B and C as experimental controls and the length of sediments from Xiangxi Bay (7) in each tube was 35 cm. Tube A also has a water column of 27 cm from Xiangxi Bay (8). All of these tubes were sealed by gum stoppers (9) with two small two measurement holes. Free space of Tube C was filled with pure nitrogen, while Tube A and B were filled with air. (b) Experimental equipment of Tube A. Three-way pipes, connecting pipes and other pipes connect the tube with nitrogen cylinder and LGR. The Greenhouse Gas Analyzer (CH4, CO2, H2O) LGR from Los Gatos Research was used to measure the concentration of greenhouse gases.
