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- W2059909145 abstract "Nitrate (1–18 p.p.m. in 5 ml of aqueous solution) is determined by conversion to nitrotoluene in 56% sulphuric acid at 70°, and extraction into toluene or a molecular complex of nitrotoluene with that solvent, followed by measurement of the absorbance of the complex at 284 nm. The few interferences (NO2-, Br-, I-, SCN-, SO32- and Hg2+) are easily eliminated. Nitrite (0.8–14 p.p.m.) may also be determined, after oxidation to nitrate with bromine water. The method takes only a few minutes. On propose un dosage de nitrate (1–18 p.p.m. dans 5 ml de solution aqueuse) par transformation en nitrotoluène et extraction dans le toluène; on mesure finalement l'absorption du complexe moléculaire formé à 284 nm. Les quelques interférences (NO2-, Br-, I-, SCN-, S032- et Hg2+) sont facilement éliminées. Les nitrites (0.8–14 p.p.m.) peuvent être également dosés après oxydation en nitrate par l'eau de brome. Cette méthode est rapide et ne prend que quelques minutes. Nitrat (1–18 p.p.m. in 5 ml wässriger Lösung) wird bestimmt, indem es in 56%iger Schwefelsäure bei 70° zu Nitrotoluol umgesetzt, dieses als Molekülkomplex mit Toluol extrahiert und die Extinktion des Komplexes bei 284 nm gemessen wird. Die geringen Störungen (NO2- , Br-, J-, SCN-, SO32- und Hg2+) werden leicht eliminiert. Nitrit (0.8–14 p.p.m.) kann nach Oxydation zum Nitrat mit Bromwasser ebenfalls bestimmt werden. Die Ausführung dauert nur wenige Minuten." @default.
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- W2059909145 date "1971-08-01" @default.
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- W2059909145 title "Spectrophotometric determination of small amounts of nitrate and nitrite by conversion to nitrotoluene and extraction into toluene" @default.
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- W2059909145 doi "https://doi.org/10.1016/s0003-2670(01)80109-4" @default.
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