Experimental equipment: CT catalyst solution 100ml, formaldehyde solution 100ml, a spray gun, a detector, a large glass container, two transparent plastic cups, a white paper, a towel, a rubber band, a solution measuring glass tube , a cling film
Experimental procedure: 1. Uniformly spray the CT catalyst solution on the towel. 2. Use a glass tube to take 1 ml of formaldehyde into a clear plastic cup, cover one of the cups with a towel coated with a CT solution, and secure it with a rubber band. 3. Place two plastic cups in large glass containers and seal them with cling film. 4. Test the ppm value once every other time (0.1ppm is the standard).