science-softCon uv/vis+ spectra data base;	www.uv-spectra.de, (C) science-softCon 2019

Substance: nitrogen oxide anion			Other Names: nitrite

Formula: NO2-					CAS-No.: 14797-65-0

Study: uv absorption spectra, photolysis, quantum yields


Authors: M. Fischer, P. Warneck

Title: Photodecomposition of Nitrite and Undissociated Nitrous Acid in Aqueous Solution

Journal/Source: J. Phys. Chem., 100, 18749-18756, (1996); DOI: 10.1021/jp961692+


Data: table, diagram

Energy/Wavelength range: 280 - 390 nm

Resolution: 2 nm

Temperature: 295 K

Temperature dependence: no

Pressure/Concentration: the total concentration was 1 mmol dm-3

Phase: aqueous solution

pH:


Comments: Quantum yields of phenol and nitrate, produced by photodecomposition in aqueous solutions of NO2- and HNO2 
in the presence of benzene as scavenger for OH radicals, have been determined as a function of wavelength between 280 and 390 nm.
The absorption maxima were found: 
NO2- at 355 nm, epsilon = 2.28 m2 mol-1;
HNO2 at 346.5 nm, 357 nm, 371 nm, and 385.5 nm, epsilon = 2.88, 4.07, 4.26, and 2.50 m2 mol-1.
For NO2- photolysis at pH 6 PHI1(OH) was found to decrease with increasing wavelength from 0.069 ± 0.008 at 280 nm to 0.022 ± 0.004 at 390 nm
The OH quantum yield PHI2(OH) for the photolysis of HNO2 at pH 2 was essentially constant over the entire wavelength range with PHI2 = 0.35 ± 0.02.

Author to whom correspondence should be addressed: (e-mail address):