title: [The influence of thermal and chemical processes on the content and structure of humic acids--the basic ingredient of peat preparations].
abstract: Water extracts with supplement NaOH, Na2CO3 and NaCl obtained in different temperatures from peat of low type were examined. These extracts are the basic ingredient of peat preparation applicable in cosmetics and therapeutics (pastes, gels, emulsions, oinments, tonics, creams. The continuous absorption spectra of humid compounds in the UV-VIS and LR range in the extracts were developed. In the differential 4th degree absorption spectra in the range UV-VIS the typical wavelengths were compared with separated absorption peaks of examined and standard humic acids. The quantitative proportions among acids in these extracts were determined. Also absorptions bands corresponding to characteristic functional groups and chemical bonds were determined. On the basis of the analysis of UV-VIS and IR absorption spectra the influence of temperature and non organic compounds supplementation on the structure (the bonds types, functional groups, molecular helicity inversion) and the content of humic compounds in water extracts was evaluated.
authors.affiliation: Zakład Tworzyw Uzdrowiskowych, Narodowy Instytut Zdrowia Publicznego - Państwowy Zakład Higieny, Poznań. mdrobnik@pzh.gov.pl
authors.forename: Michał
authors.initials: M
authors.lastname: Drobnik
authors.forename: Teresa
authors.initials: T
authors.lastname: Latour
mesh_terms: D055598:Chemical Phenomena; D006358:Hot Temperature; D006812:Humic Substances / Q000032:analysis*; D012987:Soil / Q000737:chemistry*; D014867:Water
chemical_list: D006812:Humic Substances; D012987:Soil; D014867:Water