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Chemical and spectroscopic characterization of soil organic matter fractions isolated by sequential extraction procedure
Author(s) -
SENESI N.,
TESTINI C.,
POLEMIO M.
Publication year - 1983
Publication title -
journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 0022-4588
DOI - 10.1111/j.1365-2389.1983.tb01073.x
Subject(s) - chemistry , organic matter , aromaticity , soil water , extraction (chemistry) , chemical composition , soil organic matter , characterization (materials science) , infrared spectroscopy , carbon 13 nmr , environmental chemistry , organic chemistry , molecule , materials science , soil science , environmental science , nanotechnology
Summary Soil organic matter fractions were isolated from three soils by the application of a sequential extraction procedure employing a series of 10 mild organic solvents of different polarity. The isolated organic materials were characterized by elemental, infrared and electron spin resonance analyses. They showed different chemical and structural properties which varied according to the progression of the solvent series, with some similarities between two successive extracts. The corresponding fractions extracted from the three soils were substantially similar to each other in chemical character. Along each series of extracts aliphaticity appeared to decrease, whilst aromaticity, polar oxygenated and nitrogenated functional groups, transition metal ion content and organic free radical concentrations increased. ESR spectra were structured and were put in four different classes, according to their characteristic resonances. Although the yields of extracted organic material were not high, the fractions could be considered representative of the soil organic matter composition and furnish new chemical information on its nature and properties.