Answer :
2 ppm averaged over an 8-hour work shift for nitric acid.
The 8-hour TWA PEL is the level of exposure established as the highest level of exposure an employee may be exposed to without incurring the risk of adverse health effects.
Exposure to nitric acid can cause irritation to the eyes, skin, and mucous membrane; it can also cause delayed pulmonary edema, pneumonitis, bronchitis, and dental erosion. Nitric acid is highly corrosive. Workers may be harmed from exposure to nitric acid.
The expiration date on Trace Metal Grade Nitric Acid is set to two years to ensure the integrity of the bottle is maintained and is still safe to use. Poly bottles will degrade with time, temperature, light exposure and laboratory storage conditions.
Learn more about nitric acid here:- https://brainly.com/question/10082840
#SPJ9
