Characterization and reduction of interferences in flow-injection analysis for the in situ determination of nitrate and nitrite in sea water

A Simple, Low-Cost Double Beam Spectrophotometer for Colorimetric Detection of Nitrite in Seawater

“…The latter is attractive since it offers specificity, sensitivity, long-term accuracy, and good resolution [8], [9]. The preferred colorimetric method used to measure nitrite in aqueous samples is based on the Griess reaction, in which nitrite is diazotized with sulfanilamide and then reacted with N-(1-naphthyl)-ethylenediamine dihydrochloride (NED) to form a pink-colored Azo dye [10], [11]. The color intensity of the final product (Azo dye) is proportional to the nitrite concentration present in the aqueous sample, and the detailed chemical reaction is shown in Figs. 1 and 2.…”

Spectrophotometric Determination of Nitrite Based on Its Reaction with p-Nitroaniline in the Presence of Diphenylamine in Micellar Media

“…3 Several reports have been published on the determination of nitrite including chromatography, 4,5 electrochemical detection, 6-8 capillary electrophoresis 9,10 and spectrophotometric methods. 3,[11][12][13][14][15][16][17] In some of these methods, selectivity is poor; some demand expensive and complicated instruments or reagents and the others need to do difficult and timeconsuming separation procedures.…”

Monitoring of Hydrogen Peroxide, Nitrate and Nitrite in Rain Water

“…Usually, nitrite is determined spectrophotometrically [5][6][7][8][9] by the sensitive Griess reaction using a variant developed by Shinn, 10 although other sensitive chromogenic reagents 11,12 have also been tested and proposed as alternative in spectrophotometric determinations. In addition, methods based on reductive 13 or oxidative 14 amperometry, appropriate fluorometric [15][16][17][18][19][20][21][22] or chemiluminescence 23,24 procedures, and even photoacoustic spectrometry with the Gress reagent, 25 have also been proposed.…”

“…In addition, methods based on reductive 13 or oxidative 14 amperometry, appropriate fluorometric [15][16][17][18][19][20][21][22] or chemiluminescence 23,24 procedures, and even photoacoustic spectrometry with the Gress reagent, 25 have also been proposed. Nitrate, or the sum of nitrite + nitrate, has been determined by the same reactions [5][6][7][8][11][12][13][14][23][24][25] after reduction of nitrate to nitrite. Reduction by copperized cadmium is usually proposed [5][6][7][8][11][12][13][14][23][24][25] owing to its high efficiency.…”

“…Nitrate, or the sum of nitrite + nitrate, has been determined by the same reactions [5][6][7][8][11][12][13][14][23][24][25] after reduction of nitrate to nitrite. Reduction by copperized cadmium is usually proposed [5][6][7][8][11][12][13][14][23][24][25] owing to its high efficiency. However, this reduction procedure causes serious problems, such as deterioration with use, interference with phosphate and the production of poisonous waste water containing cadmium.…”