A bstract [Foo~N, U. & LIEBEZEIT, G. (2003): An IR study of humic acids isolated from sediments and soils. -Senckenbergiana marit., 32 (1/2): 183-189, 7 figs., 2 tabs.; Frankfurt a.M.]A total of 123 humic acid isolates from terrestrial and marine, mostly North Sea, sources was analysed by Fourier-transform infrared (FT-IR) spectroscopy. The spectra were found to be strongly influenced by co-extracted clay minerals. After treatment with hydrofluoric acid the ash content of the isolates was reduced considerably. Interferences from inorganic compounds were also eliminated. IR spectra of humic acids of marine and terrestrial origin show characteristic differences only in the region below 2000 cm -1. Although marine humic acids tend to contain more protein-related functions, it is not possible to distinguish marine and terrestrial samples by FT-IR spectroscopy alone. A combination with other suitable parameters, e.g. IR and UV/Vis absorbance data (A270 nm/A407 nm), helps to specify different sources of humic materials.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.