science-softCon uv/vis+ photochemistry database;	www.photochemistry.org; (C) science-softCon 2019

Substance: nitrate anion				Other Names: nitrate

Formula: NO3-						CAS-No.: 14797-55-8

Study: actinometry, absorption spectrum, quantum yields


Authors: J.J. Jankowski, D.J. Kieber, K. Mopper

Title: Nitrate and Nitrite Ultraviolet Actinometers

Journal/Source: Photochemistry and Photobiology, 70(3), 319-328, (1999); DOI: 10.1111/j.1751-1097.1999.tb08143.x


Data: diagram, table

Energy/Wavelength range: 290 - 360 nm

Resolution: 

Temperature: 298 K

Temperature dependence: no

Pressure/Concentration: 10 mM nitrate and 1 mM nitrite in a 2.5 mM bicarbonate solution containing 1 mM benzoic acid

Phase: solution

pH:


Comments: Molar absorption coefficients were determined for nitrate from 290 to 360 nm and for nitrite from 290 to 425 nm.
Nitrite absorption occurs throughout the UVB and UVA, with a maximum absorption at 354 nm.
Nitrate has two principal absorption bands, the first is an intense Pi-->Pi* band occurring in the far UV (epsilon(max) = 9500 M-1 cm-1 
at 201 nm), while the second is a weak absorption band centered at 302 nm (epsilon(max) = 7.14 M-1 cm-1) see (Meyerstein et al.,
Trans. Faraday Soc. 57, 2104–2112, (1961).
Molar absorption coefficient values reported here are in excellent agreement with published values for both nitrate (e.g.
epsilon(305nm) = 7.01 M-1 cm-1 and nitrite epsilon(354nm) = 22.73 M-1 cm-1.

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