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Lipids of soil humic acids. II. Residual components after hymatomelanic acid extraction

AuthorsGrimalt, Joan O. ; Hermosín, Bernardo ; Yruela Guerrero, Inmaculada ; Sáiz-Jiménez, Cesáreo
Issue Date1989
CitationScience of the Total Environment 81-82: 421- 428 (1989)
AbstractAfter separation of the hymatomelanic acid fraction more lipid components can be recovered from humic acids by Soxhlet extraction with other solvents than ethanol (i.e., methylene chloride-methanol). The composition of these remaining mixtures has been investigated on the humic acids of three soils encompassing different properties in terms of pH, carbon content and associated vegetation (a Typic Xerochrept, a Typic Rendoll and a Typic Xerorthent). The hymatomelanic acid fraction of these samples has been studied elsewhere (ref. 1). Unsubstituted fatty acids generally predominate in both successive extracts, although distinct distributions are characteristics in each case. Important qualitative differences have been observed for other components, namely steroidal ketones and hydroxy acids.
Identifiersdoi: 10.1016/0048-9697(89)90150-2
issn: 0048-9697
e-issn: 1879-1026
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