The infra-red spectra of humic acids

Abstract

Abstract It is well krown that many investigations have been presented on the visible and ultraviolet absorption spectra of soil humic acids, and they contributed greatly to our knowledge on the nature of humus. On the other hand, there have been very few works on the infared spectra of humic acids, though it is expected that they would give us useful information on their nature, especially furctional groups.