Spectrophotometric determination of small amounts of nitrate and nitrite by conversion to nitrotoluene and extraction into toluene

Bhatty, M. K.; Townshend, Alan

doi:10.1016/s0003-2670(01)80109-4

Cited by 16 publications

(4 citation statements)

References 6 publications

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“…Nitro samine can result from an interaction between nitrite ion and existing secondary amines. For example, N-nitrososarcosine readily is produced from creatine and nitrite ion (7). Creatine is present in the muscular tissue of many vertebrates and is a normal constituent of meat.…”

Section: Discussionmentioning

confidence: 99%

Spectrophotometric determination of cobalt with 2,4,6-tris(2'-pyridyl)-s-triazine

Janmohamed¹,

Ayres²

1972

Anal. Chem.

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Cobalt(ll) reacts rapidly with 2,4,6-tris(2'-pyridyl)-$triazine (TPTZ) in water-alcohol solution at pH 8.5 to give a red-orange solution having absorption peaks at 485 and 404 nm. The color is stable for at least an hour. The system conforms to Beer's law. Optimum range for 1.00-cm optical path is 4 to 20 ppm of cobalt, determined with a relative standard deviation of about 1%. The molar absorptivity at 485 nm is 2.8 X 103. Ions of several transition elements interfere. Cobalt is separated from iron and nickel by an extraction procedure using tri-n-butyl phosphate. A reaction ratio of 1 to 2 for cobalt to TPTZ has been deduced from spectrophotometric data, and the perchlorate salt of the complex has been isolated and analyzed. The ionization constant of the reagent and the formation constant of the cobalt-TPTZ complex have been evaluated.

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Section: Discussionmentioning

confidence: 99%

Spectrophotometric determination of cobalt with 2,4,6-tris(2'-pyridyl)-s-triazine

Janmohamed¹,

Ayres²

1972

Anal. Chem.

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“…Chloride and bromide ions were determined by direct potentiometry employing Orion specific ion electrodes and a calomel reference electrode (Castro and Bartnicki, 1965; Castro and Belser, 1966). Nitrate ion was assayed by nitrating toluene and determining the amount of nitrotoluene in toluene by the absorption spectrum of the molecular complex (Bhatty and Townshend, 1971). Nitrite was determined in two ways: by using the above procedure, with a prior oxidation to nitrate and by diazotization and coupling of sulfanilic acid with •( 1naphthyl)ethylenediamine (Feinsilver and Oberst, 1953).…”

mentioning

confidence: 99%

Photohydrolysis of methyl bromide and chloropicrin

Castro¹,

Belser²

1981

J. Agric. Food Chem.

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“…It is apparent from the literature that the measurement of very small amounts of nitrate has been an especially difficult problem for the analytical chemist 12 , one result being a plethora of assay techniques that did not quite solve the problem. Despite the foregoing, there have been many reports of nitrate C min values close to or even below apparent detection limits of the methods employed, published without explanatory analytical comment.…”

Section: Introductionmentioning

confidence: 99%

Ion chromatography in nutrient depletion studies: Measurement of very low nitrate concentrations

Grunau

Swiader

1989

Communications in Soil Science and Plant Analysis

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Determination of the extent to which plants can deplete nitrate from nutrient solutions (C min ) has been hindered in the past by insufficiently sensitive assay techniques. Now ion chromatography on a Dionex AS4A column can be used to separate and quantitate as little as 5 pmoles nitrate (a sensitivity of 0.02 + 0.005 µM NO 3 -[0.3 ppb NO 3 -N]) in nutrient medium containing other anions in more than 10 5 molar excess. To obtain this precision in actual depletion experiments, however, certain important precautions must be observed, including the avoidance of membrane filters with interfering extractables, i.e. all types tested. Under these conditions, other components of the medium do not interfere, nor apparently do root exudates. The sensitivity and absence of interference is compared with that of existing methods for nitrate estimation (nitrate electrode, salicylate, phenoldisulfonate, nitrate reductase/ nitrite diazotization, and ultraviolet absorption, alone, or coupled with high pressure liquid chromatography). The technique is used to demonstrate that pumpkins (Cucurbita moschata Poir.) growing in nutrient solutions can deplete nitrate at least to 0.16 µM, a concentration probably not measurable by any non-chromatographic method, and measurable accurately at present only by the ion chromatography technique described here. Chloride uptake, and efflux, has also been measured simultaneously from the same chromatography profiles.

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Spectrophotometric determination of small amounts of nitrate and nitrite by conversion to nitrotoluene and extraction into toluene

Cited by 16 publications

References 6 publications

Spectrophotometric determination of cobalt with 2,4,6-tris(2'-pyridyl)-s-triazine

Spectrophotometric determination of cobalt with 2,4,6-tris(2'-pyridyl)-s-triazine

Photohydrolysis of methyl bromide and chloropicrin

Ion chromatography in nutrient depletion studies: Measurement of very low nitrate concentrations

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