Water removal method for gas concentration sampling, sampling method and device therefor

A water removal device for gas concentration and sampling, comprising a first cold trap, a second cold trap, a concentration cold trap and a control module;

• wherein
• the first cold trap has a cold trap tube filled with hydrophilic materials therein;
• the second cold trap has a cold trap tube filled with hydrophobic organic substance-adsorbing materials therein;
• the control module includes three control modes;
• wherein
• a first control mode is configured to control the first cold trap and the concentration cold trap to both operate in cooling states, and to control a controllable valve in a pipeline, so that a sample gas from a sample gas source passes through the cold trap tube of the first cold trap and a cold trap tube of the condensation cold trap successively, and the sample gas successively undergoes water removal and condensation;
• a second control mode is configured to control the first cold trap to operate in a heating state, to control the second cold trap to operate in a cooling state, and to control the controllable valve in the pipeline, so that a carrier gas from a carrier gas source passes through the cold trap tubes of the first cold trap and the second cold trap successively to adsorb organic substances desorbed from the cold trap tube of the first cold trap and to carry moisture desorbed from the cold trap tube of the first cold trap out of the cold trap tube of the second cold trap by means of the carrier gas;
• a third control mode is configured to control the first cold trap and the second cold trap to both operate in heating states, and to control the controllable valve in the pipeline, so that the carrier gas from the carrier gas source passes through the cold trap tubes of the first cold trap and the second cold trap respectively, and then enters the cold trap tube of the concentration cold trap to concentrate the organic substances desorbed from the cold trap tubes of the first cold trap and the second cold trap.