ABSTRACT
Nitric acid is manufactured in large amounts because it is an important intermediate product for the production of chemical fertilizers. It is manufactured at concentrations ranging from 55 to 65%, known as "diluted acid." The tail gases resulting from dilute nitric acid manufacture contain nitrogen oxides (NOx) and oxygen (2 to 4 vol %), the remainder being nitrogen and water vapors. In addition to their toxicity for plants and animals, nitrogen oxides are corrosive as a result of their conversion into acids when in contact with precipitation.
