Ultraviolet Determination of Nitrogen Dioxide as Nitrite Ion

Abstract

toluene. The column efficiency in each case was calculated from the toluene elution curve by using Equation 3. The experimental conditions and results are given in Figures 10 and 11.These results show that for very small sample volumes the column efficiency increases as the percentage of liquid in the stationary phase is decreased.The reasons for this have been fullydiscussed by Cheshire and Scott (3).For relatively large samples higher (1956).(10) Whitham, B. T., "Vapour Phase Chromatography," D. H. Desty, ed., p. 194, Butterw'orths Scientific Publications, London, 1957.

Studies on Horseradish Peroxidase. XII. A Kinetic Study of the Oxidation of Sulfite and Nitrite by Compounds I and II

“…Spectra of sodium nitrite and potassium nitrate were obtained from 400-270 nm on the Cary 14 spectrophotometer. The molar absorptivity of the nitrite maximum at 355 nm agreed with the published value to within 1% (15). Potassiun~ nitrate had no observable absorbance at 355 nm.…”

“…These sulfite solutions were found to undergo less than 1% decomposition over a period of 8 h. Sodium nitrite was obtained from the Baker Chemical Co. (stated purity 100.7%). Stock solutions of nitrite were prepared by weighing; their concentrations were checked at 355 nm using a molar absorptivity value of 23.0 M-' cm-' (15). Solutions from 0.1 to M were stable for several weeks when stored in the dark.…”

Application of the 3-Methyl-2-Benzothiazolone Hydrazone Method for Atmospheric Analysis of Aliphatic Aldehydes.

“…In one experiment the system was switched from dynamic flow to static operation in the reaction chamber after 2 hours; irradiation for the next 2.5 hours was under static conditions. The aliphatic aldehyde concentration just (1 ) before the system was switched from dynamic to static conditions was 0.52 p.p.m. ; under static conditions, the aldehyde concentration was measured at various times as 0.50, 0.53, and 0.52 p.p.m.…”

“…COMPILATION OF REAGENT SENSITIVITIES Table I presents a compilation of a number of hydroxyanthraquinone and anthraquinonylamine reagents which have been investigated for the colorimetric determination of boron. The sensitivities of the reagents, obtained under various conditions of usage, are presented in units of absorptivity, a (1).…”

Reducing emissions from uranium dissolving

“…It was then sparged into a measured amount of 10% KOH. The resultant nitrite was measured directly by absorbance at 377 nm using the method developed by Altshuller and Wartburg (1960).…”