UV-visible spectrum of nitrous acid in solution : pKa determination and analytical applications

The UV-visible spectra of nitrous acid in aqueous solutions and in other solvents (methanol, acetonitrile and benzene) were obtained and a specific method for nitrite detection was developed. The hyperfine structure observed in all these spectra was tentatively attributed to vibrational coupling. Th...

Full description

Saved in:
Bibliographic Details
Published inAnalytica chimica acta Vol. 282; no. 1; pp. 81 - 85
Main Authors DAS GRACAS GOMES, M, DA S.S. BORGES, S, LOPES, L. G. F, FRANCO, D. W
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier 01.10.1993
Subjects
Analytical chemistry
Chemistry
Exact sciences and technology
Spectrometric and optical methods
Hyperfine structure
Chemical analysis
Medium effect
Dissociation constant
Aqueous solution
Solvent
Nitrous acid
Ultraviolet visible spectrometry
Online AccessGet full text

Cover

More Information
Summary:The UV-visible spectra of nitrous acid in aqueous solutions and in other solvents (methanol, acetonitrile and benzene) were obtained and a specific method for nitrite detection was developed. The hyperfine structure observed in all these spectra was tentatively attributed to vibrational coupling. The unique characteristics of the spectrum in acidic solution allowed nitrite to be determined at 0.00003 mol per litre in the presence of 0.1 mol nitrate per litre in solution. Through spectrophotometric and potentiometric measurements, the pKa value for nitrous acid was calculated to be 2.3 plus/minus 0.2.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0003-2670
1873-4324
DOI:10.1016/0003-2670(93)80354-n