Acetic acid detection tube 145 Propyl acetate, measuring range 20 to 500 ppm, is a semi quantitative method, but it has large errors, multiple interference factors, and the test paper itself is prone to failure. At present, commonly used test strips for detecting ammonia, organophosphorus pesticides, carbon monoxide, phosgene, hydrogen cyanide, hydrogen sulfide, formaldehyde, acetaldehyde, nitrogen dioxide, hypochlorous acid, hydrogen peroxide, etc. The tracheal examination method has the characteristics of simplicity, speed, and direct reading