Spectrophotometric determination of nitrite and nitrate using phosphomolybdenum blue complex

A simple and sensitive spectrophotometric method for the determination of trace amounts of nitrite in environmental and biological samples using 4-amino-5-hydroxynaphthalene-2,7-disulphonic acid monosodium salt

“…The suggested method has significant advantages over other existing methods [27,39,48,51,52] due to simplicity of the procedure where only AHNDMS as a single reagent is used. It has less interference by other substances.…”

“…The APHA and AOAC official method of analysis involves the reaction of N-(1-naphthyl) ethylenediamine dihydrochloride with sulphanilamide [5,47]. This method requires careful control of acidity at each step of the process and has a carcinogenic effect [48].…”

Simultaneous Determination of Nitrite and Nitrate in Potato and Water Samples Using Negative Electrospray Ionization Ion Mobility Spectrometry

“…Many methods, including spectrophotometric, 6,7 chromatographic, [8][9][10][11] potentiometric, 12,13 gas chromatographymass spectrometry (GC-MS) and liquid chromatography with fluorescence detection 14 and flow injection analysis [15][16][17] have been reported for the quantitative and qualitative analysis of nitrite and nitrate. Nonetheless, most of these methods suffer from a number of disadvantages, such as highly complication and laborious derivitization, the need for toxic reagents and harmful organic solvents, extensive sample preparation, time-consuming analysis, stability of the colored product formed, etc.…”

Spectrophotometric Determination of Phosphate Anion Based on the Formation of Molybdophosphate in Ethylene Glycol-Water Mixed Solution

“…5,25 However, neither 1 mM NO2 -nor 10 mM NO3 -anions led to a significant error in the phosphate determination as seen in the table.…”