Electron paramagnetic resonance in humic substances
摘要：
Electron spin resonance (ESR) measurements of soil and its fractions (humic acids, fulvic acids, post-extraction residues and bitumens) were performed and particular attention given to free radicals of organic origin. For such radicals in soil, two lines with g factors 2.004 and 2.002 were observed. For all four fractions one line was observed. To obtain more information on the radical structure, the samples were carbonized. This allowed the different chemical structures of each of the two organic radicals to be differentiated. However, it was not possible to ascribe any definite structure to these radicals. Heat-treatment measurements indicated that the humification process shows some similarity to the process of carbonization at low temperature.
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DOI：
10.1111/j.1365-2389.1989.tb01326.x
年份：
2006
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