DIFFUSIVE GAS CONCENTRATION DETECTION PIPE

PROBLEM TO BE SOLVED: To provide a diffusive gas concentration detection pipe bringing about measurement of better accuracy and higher sensitivity from a viewpoint of the subject related to a measure of an endocrine disruptor having become a problem in recent years. SOLUTION: The diffusion type gas concentration detection pipe is equipped with a rod-shaped air permeable porous body 142 and the reagent impregnated carrier 144 allowed to fill the periphery of the air permeable porous body 142. The body 142 has a through-hole 142A provided to the center in the longitudinal direction thereof and, as a material thereof, a chemical resistance material such as polyethylene, polypropylene, Teflon (R) or the like is designated and used in a form of an open-cell type foam. As the air permeable porous body 142, for example, a silica gal, activated alumina, silica sand or the like can be used. As a material of press fitting bodies 16 and 16, a material similar to the air permeable porous carrier 142 and a usual material, for example, a fabric such as cotton cloth, a nonwoven fabric, filter paper, porous ceramics or the like are designated.