The majority of the mass of stratospheric aerosol collected during the spring of 1993 consisted principally of particles of d >0.20 mu containing a mixture of H2SO4 and (NaK)2SO4. However, the composition of the more numerous particles with d< 0.2 mu was very different. X-ray emission spectra (EDS) of individual particles indicated that there were three different chemical populations of small particles. The most numerous population was almost all C with only traces of S and Na. The second population contained metal sulfates and chlorides, possibly accreted to a C-containing matrix. The third population consisted of S- and Cl- containing species and trace amounts of Na and K ions. The number of equivalents of metal ion was much less than that of S and Cl species, indicating that most of the S and Cl was not ionic, but was covalently bonded, perhaps to a C matrix.
Scott, Joseph D. and Chittenden, David M. II
"Chemical Composition of Particles of d < 0.20 mu in the Lower Stratospheric Aerosol, Spring 1993,"
Journal of the Arkansas Academy of Science: Vol. 56
, Article 23.
Available at: http://scholarworks.uark.edu/jaas/vol56/iss1/23