Abstract: A water removal method for gas concentration sampling, and a sampling method and device. The water removal method comprises: removing water from a sample gas by means of a first cold trap tube filled with a hydrophilic material, and then concentrating the sample gas by means of a concentration cold trap tube; then by means of a carrier gas, conveying components desorbed by the first cold trap tube under a heating state to a second cold trap tube that is in a cooled state and that is filled with a hydrophobic organic adsorbent material, and adsorbing organic substances in the components desorbed by the first cold trap tube: by means of the carrier gas, bringing the moisture desorbed by the first cold trap tube out of the second cold trap tube, and then by means of the carrier gas, conveying residual components desorbed by the first cold trap tube and the second cold trap tube under the heating state to the concentration cold trap tube for concentration.

Abstract: A water removal method for gas concentration sampling, and a sampling method and device. The water removal method comprises: removing water from a sample gas by means of a first cold trap tube filled with a hydrophilic material, and then concentrating the sample gas by means of a concentration cold trap tube; then by means of a carrier gas, conveying components desorbed by the first cold trap tube under a heating state to a second cold trap tube that is in a cooled state and that is filled with a hydrophobic organic adsorbent material, and adsorbing organic substances in the components desorbed by the first cold trap tube: by means of the carrier gas, bringing the moisture desorbed by the first cold trap tube out of the second cold trap tube, and then by means of the carrier gas, conveying residual components desorbed by the first cold trap tube and the second cold trap tube under the heating state to the concentration cold trap tube for concentration.

Abstract: A multi-channel headspace extraction needle is provided. The extraction needle includes an inner needle tube, a sealed connector, and a needle rod and an outer needle tube respectively installed on a top portion and a bottom portion of the sealed connector. The sealed connector includes a first conduit and a second conduit connected with a tube lumen of the outer needle tube. A sealing layer is disposed between a bottom tube wall of the inner needle tube, which extends into the tube lumen of the outer needle tube, and a sidewall of the outer needle tube. The sidewall of the outer needle tube includes a first through-hole and a second through-hole respectively disposed above and under the sealing layer. The first through-hole is connected with the tube lumen of the outer needle tube and the second through-hole is connected with a tube lumen of the inner needle.

Abstract: A multi-channel headspace extraction needle is provided. The extraction needle includes an inner needle tube, a sealed connector, and a needle rod and an outer needle tube respectively installed on a top portion and a bottom portion of the sealed connector. The sealed connector includes a first conduit and a second conduit connected with a tube lumen of the outer needle tube. A sealing layer is disposed between a bottom tube wall of the inner needle tube, which extends into the tube lumen of the outer needle tube, and a sidewall of the outer needle tube. The sidewall of the outer needle tube includes a first through-hole and a second through-hole respectively disposed above and under the sealing layer. The first through-hole is connected with the tube lumen of the outer needle tube and the second through-hole is connected with a tube lumen of the inner needle.