Skip to content

An isotopic analysis of ionising radiation as a source of sulphuric acid

by M. B. Enghoff, N. Bork, S. Hattori, C. Meusinger, M. Nakagawa, J. O P Pedersen, S. Danielache, Y. Ueno, M. S. Johnson, N. Yoshida, H. Svensmark show all authors
Atmospheric Chemistry and Physics ()
Get full text at journal


Sulphuric acid is an important factor in aerosol nucleation and growth.\nIt has been shown that ions enhance the formation of sulphuric acid\naerosols, but the exact mechanism has remained undetermined. Furthermore\nsome studies have found a deficiency in the sulphuric acid budget,\nsuggesting a missing source. In this study the production of sulphuric\nacid from SO2 through a number of different pathways is investigated.\nThe production methods are standard gas phase oxidation by OH radicals\nproduced by ozone photolysis with UV light, liquid phase oxidation by\nozone, and gas phase oxidation initiated by gamma rays. The\ndistributions of stable sulphur isotopes in the products and substrate\nwere measured using isotope ratio mass spectrometry. All methods\nproduced sulphate enriched in S-34 and we find an enrichment factor\n(delta S-34) of 8.7 +/- 0.4 parts per thousand (1 standard deviation)\nfor the UV-initiated OH reaction. Only UV light (Hg emission at 253.65\nnm) produced a clear non-mass-dependent excess of S-33. The pattern of\nisotopic enrichment produced by gamma rays is similar, but not equal, to\nthat produced by aqueous oxidation of SO2 by ozone. This, combined with\nthe relative yields of the experiments, suggests a mechanism in which\nionising radiation may lead to hydrated ion clusters that serve as\nnanoreactors for S(IV) to S(VI) conversion.

Cite this document (BETA)

Readership Statistics

17 Readers on Mendeley
by Discipline
35% Chemistry
35% Earth and Planetary Sciences
18% Environmental Science
by Academic Status
24% Student > Master
24% Researcher
24% Student > Ph. D. Student
by Country
6% United Kingdom
6% China
6% Canada

Sign up today - FREE

Mendeley saves you time finding and organizing research. Learn more

  • All your research in one place
  • Add and import papers easily
  • Access it anywhere, anytime

Start using Mendeley in seconds!

Sign up & Download

Already have an account? Sign in