Abstract

Dilute nitric, sulfuric, and perchloric acids are applicable as solvents for spectrophotometry up to 250°C over the following ranges: 0 to 1.0 f HNO₃ from 0.6 to 1.2 μ; 0 to 0.2 f H₂SO₄ from 0.25 to 1.2 μ; and 0 to 1.0 f DClO₄ from 0.25 to 1.8 μ. Each of these acids reacts measurably with the titanium cell wall and the sapphire windows at rates which increase with acidity and temperature. This corrosion affects the spectral measurements as a function of time and is associated with deterioration of cell window surfaces and the presence in the sample of dissolved and suspended corrosion products. These results are part of our more general program for the development of equipment and technique for routine spectrophotometry of pure liquids and solutions over a wide range of temperature and pressure.

Measurement of the refractive indices of H₂SO₄–HNO₃–H₂O solutions to stratospheric temperatures

Ulrich K. Krieger, Juliane C. Mössinger, Beiping Luo, Uwe Weers, and Thomas Peter
Appl. Opt. 39(21) 3691-3703 (2000)

Infrared optical constants of a ternary system of 75% H₂SO₄, 10% HNO₃, and 15% H₂O

R. W. Adams and H. D. Downing
J. Opt. Soc. Am. A 3(1) 22-28 (1986)

Infrared absorption coefficients of gaseous H₂SO₄ and SO₃

Richard F. Majkowski, Richard J. Blint, and John C. Hill
Appl. Opt. 17(7) 975-977 (1978)

Infrared absorption coefficient of H₂SO₄ vapor from 1190 to 1260 cm⁻¹

Richard F. Majkowski
J. Opt. Soc. Am. 67(5) 624-627 (1977)

Ultrahigh (10⁻⁴ cm⁻¹) resolution study of the 8.2-μm and 11.3-μm bands of H₂SO₄: accurate determination of absorbance and dissociation constants

R. S. Eng, G. Petagna, and K. W. Nill
Appl. Opt. 17(11) 1723-1726 (1978)