Simultaneous microdetermination of nitrates and nitrites by differential gasometric reactions

Performance characteristics and some applications of the nitrogen oxide gas sensor

“…Titrimetric procedure based on the reaction of sulfamic acid with potassium nitrite and monitored with the nitrogen oxide gas sensor was also tested. The reaction is known to be selective, rapid, and quantitative (21,22). A typical potentiometric curve with inflection break of ~100 mV at the equivalence point is obtainable (Figure 2).…”

Determination of ultratrace ammonium, nitrite, and nitrate nitrogens by atmospheric pressure helium microwave-induced plasma emission spectrometry with gas generation technique

“…Hence, this paper reports the convenient, sensitive and selective methods for the direct determination of ammonium and nitrite nitrogens in solution by the helium MIP emission spectrometry with nitrogen gas generation technique. Ammonium ion is oxidized to nitrogen gas by sodium hypobromite in an alkaline medium (15), and nitrite ion is reduced to nitrogen gas by sulfamic acid in an acidic medium (16). Nitrate ion is reduced to nitrite ion with a Cd-Cu column and determined by the same method as that for nitrite nitrogen.…”

“…Several methods were identified for the particle size independent determination of wear metals in lubricating oils. Many authors have reported the use of wet ashing and dry ashing techniques which can be quite effective (16)(17)(18). However, wet ashing and dry ashing methods are very time consuming and laborious.…”

Determination of nitrate and nitrite at the parts per billion level by chemiluminescence

“…This presentation is directed toward the development of analytical methodology for nitrate and nitrite by chemical reduction to nitric oxide and subsequent determination via its chemiluminescent reaction with ozone. Equations for the respective half reactions are: N03-+ 4H+ + 3e = NO + 2H20 E°= +0.96 V N02-+ 2H+ + e = NO + H20 E°= +1.00 V Although the standard reduction potentials for nitrate and nitrite are similar, it has been demonstrated that nitrite can be reduced under much milder conditions than nitrate (25). By correctly choosing the reaction conditions, nitrite can be determined selectively.…”