Lipids of soil humic acids. II. Residual components after hymatomelanic acid extraction
After 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.
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1989
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dig-irnas-es-10261-584752020-07-03T12:19:44Z Lipids of soil humic acids. II. Residual components after hymatomelanic acid extraction Grimalt, Joan O. Hermosín, Bernardo Yruela Guerrero, Inmaculada Sáiz-Jiménez, Cesáreo After 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. Peer Reviewed 2012-10-19T10:40:39Z 2012-10-19T10:40:39Z 1989 2012-10-19T10:40:40Z artículo http://purl.org/coar/resource_type/c_6501 doi: 10.1016/0048-9697(89)90150-2 issn: 0048-9697 e-issn: 1879-1026 Science of the Total Environment 81-82: 421- 428 (1989) http://hdl.handle.net/10261/58475 10.1016/0048-9697(89)90150-2 en none Elsevier |
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After 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. |
format |
artículo |
author |
Grimalt, Joan O. Hermosín, Bernardo Yruela Guerrero, Inmaculada Sáiz-Jiménez, Cesáreo |
spellingShingle |
Grimalt, Joan O. Hermosín, Bernardo Yruela Guerrero, Inmaculada Sáiz-Jiménez, Cesáreo Lipids of soil humic acids. II. Residual components after hymatomelanic acid extraction |
author_facet |
Grimalt, Joan O. Hermosín, Bernardo Yruela Guerrero, Inmaculada Sáiz-Jiménez, Cesáreo |
author_sort |
Grimalt, Joan O. |
title |
Lipids of soil humic acids. II. Residual components after hymatomelanic acid extraction |
title_short |
Lipids of soil humic acids. II. Residual components after hymatomelanic acid extraction |
title_full |
Lipids of soil humic acids. II. Residual components after hymatomelanic acid extraction |
title_fullStr |
Lipids of soil humic acids. II. Residual components after hymatomelanic acid extraction |
title_full_unstemmed |
Lipids of soil humic acids. II. Residual components after hymatomelanic acid extraction |
title_sort |
lipids of soil humic acids. ii. residual components after hymatomelanic acid extraction |
publisher |
Elsevier |
publishDate |
1989 |
url |
http://hdl.handle.net/10261/58475 |
work_keys_str_mv |
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1777664398796521472 |