<Ul> <Li> 0.00047 ppm or 0.47 ppb is the odor threshold , the point at which 50 % of a human panel can detect the presence of an odor without being able to identify it . </Li> <Li> 10 ppm is the OSHA permissible exposure limit ( PEL ) ( 8 hour time - weighted average ) . </Li> <Li> 10 -- 20 ppm is the borderline concentration for eye irritation . </Li> <Li> 20 ppm is the acceptable ceiling concentration established by OSHA . </Li> <Li> 50 ppm is the acceptable maximum peak above the ceiling concentration for an 8 - hour shift , with a maximum duration of 10 minutes . </Li> <Li> 50 -- 100 ppm leads to eye damage . </Li> <Li> At 100 -- 150 ppm the olfactory nerve is paralyzed after a few inhalations , and the sense of smell disappears , often together with awareness of danger . </Li> <Li> 320 -- 530 ppm leads to pulmonary edema with the possibility of death . </Li> <Li> 530 -- 1000 ppm causes strong stimulation of the central nervous system and rapid breathing , leading to loss of breathing . </Li> <Li> 800 ppm is the lethal concentration for 50 % of humans for 5 minutes ' exposure ( LC50 ) . </Li> <Li> Concentrations over 1000 ppm cause immediate collapse with loss of breathing , even after inhalation of a single breath . </Li> </Ul>
<Ul> <Li> 0.00047 ppm or 0.47 ppb is the odor threshold , the point at which 50 % of a human panel can detect the presence of an odor without being able to identify it . </Li> <Li> 10 ppm is the OSHA permissible exposure limit ( PEL ) ( 8 hour time - weighted average ) . </Li> <Li> 10 -- 20 ppm is the borderline concentration for eye irritation . </Li> <Li> 20 ppm is the acceptable ceiling concentration established by OSHA . </Li> <Li> 50 ppm is the acceptable maximum peak above the ceiling concentration for an 8 - hour shift , with a maximum duration of 10 minutes . </Li> <Li> 50 -- 100 ppm leads to eye damage . </Li> <Li> At 100 -- 150 ppm the olfactory nerve is paralyzed after a few inhalations , and the sense of smell disappears , often together with awareness of danger . </Li> <Li> 320 -- 530 ppm leads to pulmonary edema with the possibility of death . </Li> <Li> 530 -- 1000 ppm causes strong stimulation of the central nervous system and rapid breathing , leading to loss of breathing . </Li> <Li> 800 ppm is the lethal concentration for 50 % of humans for 5 minutes ' exposure ( LC50 ) . </Li> <Li> Concentrations over 1000 ppm cause immediate collapse with loss of breathing , even after inhalation of a single breath . </Li> </Ul>
what is the odor threshold for hydrogen sulfide
what is the odor threshold for hydrogen sulfide
0.00047 ppm or 0.47 ppb
0.00047 ppm or 0.47 ppb