Determination of nitrate in natural waters with the photo-induced conversion of nitrate to nitrite

Photoinduced decomposition of nitrate in drinking water in the presence of titania and humic acids

“…An increasing rate of formation of nitrite with increasing pH in the range of 5 to 8 was reported by Daniels [5], Wagner [6], Warneck [7], and Shuali [31]. Photoreduction of nitrate to nitrite has also been applied for the quantitative analysis of nitrate [32,33], with an increased reduction efficiency at increased pH. Consistent with the literature, nitrate in aqueous solution was observed to react under irradiation.…”

On-Line Photo-Oxidative Decomposition of Phosphorus Compounds to Orthophosphate and Its Application to Flow Injection Spectrophotometric Determinations of Total Phosphorus in River and Waste Waters

“…By using PTFE tubing, which was easily coiled around the mercury lamps, the reduction of NO 3 -to NO 2 -was enhanced. The reduction efficiency reached about 70 -84%, which was higher compared with that of a quartz coil reported by Takeda et al 1 The effect of the inner diameter of PTFE tubing on the decomposition rate was examined with 1.0 mm i.d., 0.8 mm i.d. and 0.5 mm i.d.…”

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.…”