Spectrophotometric Determination of Nitrite Esters and Salts in Coolant Media

摘要

The method is based on the reduction of yellow ceric salts by nitrites, and the subsequent loss of color is employed as a means of estimating the percentage of nitrite. The absorption of visible light at 400 millimicrons by the reduced ceric solution is chosen as the wavelength for quantitative colorimetric measurements. After removal of dye this wavelength is free of interference from other antifreeze consituents normally found in current antifreeze compounds. (Author)