The principal method of manufacture of nitric acid is the catalytic oxidation of ammonia.
Employing electrochemical method, the concentration of nitric acid had been reduced from 4 to about 0.5 M, under constant current/potential conditions in batch mode, for the purpose of optimizing the process parameters for the destruction of nitric acid in radioactive liquid waste, with good energy efficiency.
Burning lean mixture in spark ignition (SI) engine leads to decrease in temperature of combustion process and is one of the methods of limiting nitric oxide emission and increasing the engine efficiency.
Five samples were digested with three different acid digestion methods namely method A (a combination of nitric-perchloric acids HNO3 HClO4 in a ratio 2 1), method B (only nitric acid HNO3), and method C (a mixture of nitric-hydrochloric acids HNO3 HCl in a ratio 1 3), to recommend the most efficient digestion method that gains the highest analyte recovery.
A method of rice digestion using nitric acid and hydrogen peroxide to determine metals (Al, Ca, Cd, Co, Cr, Cu, Fe, K, Mg, Mn, Na, Ni, Pb and Zn) using Inductively Coupled Plasma Optical Emission Spectrometry (ICP OES) was developed.
There remains considerable interest in developing methods for the targeted delivery of nitric oxide and other small molecule bioregulators such as carbon monoxide to physiological targets.
A new method for the direct catalytic decomposition of nitric oxide (NO) is proposed in order to overcome several well-known problems toward its practical use.
Samples of natural clinoptilolite were modified by an acid thermal method at nitric acid concentrations of 0.25, 0.5, 1.0, and 3.0 M and a contact time of 30 min.
The older method of removing silver involved the use of nitric and sulphuric acids, and was dangerous and expensive.
