[Analytical methods for nitrate and nitrite determination in foods. 3. Spectrophotometric determination of nitrate and nitrite using sulphanilic acid/1-naphylamine, and of nitrite using resorcinol/zirconium (IV) oxychloride].
The Nitrate content of foods may be determined by means of azo-dye coupling after reduction of the nitrate with the aid of active cadmium produced in the sample solution. An easy method for determining nitrite consists in the colorimetric estimation of a coloured chelate formed from nitrite, resorcinol and zirconium(IV) oxychloride.
D015057:1-Naphthylamine; D005504:Food Analysis; D007202:Indicators and Reagents; D009566:Nitrates / Q000032:analysis*; D009573:Nitrites / Q000032:analysis*; D012118:Resorcinols; D013053:Spectrophotometry / Q000379:methods; D013425:Sulfanilic Acids; D015040:Zirconium
D007202:Indicators and Reagents; D009566:Nitrates; D009573:Nitrites; D012118:Resorcinols; D013425:Sulfanilic Acids; D015057:1-Naphthylamine; D015040:Zirconium; C026090:zirconium oxychloride
Zur Nitrat- und Nitritanalytik in Futtermitteln. 3. Mitt. Spektrophotometrische Bestimmung von Nitrat und Nitrit mit Sulfanilsäure/1-Naphthylamin sowie Nitrit mit Resorcin/Zirkonium(IV)-oxidchlorid.