Premium
An evaluation of some oxidative degradation methods of humic substances applied to carbohydrate‐derived humic‐like polymers
Author(s) -
ALMENDROS G.,
LEAL J. A.
Publication year - 1990
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.1365-2389.1990.tb00044.x
Subject(s) - chemistry , permanganate , humic acid , depolymerization , degradation (telecommunications) , hydrolysis , lignin , polymer , oxide , alkaline hydrolysis , acid hydrolysis , organic chemistry , nuclear chemistry , telecommunications , fertilizer , computer science
SUMMARY Artificial polymers prepared by acid‐catalysed dehydration of glucose were examined by 13 C nuclear magnetic resonance (NMR), and subjected to degradation procedures frequently used in the study of humic substances: acid hydrolysis, persulphate degradation, alkaline permanganate oxidation, perborate depolymerization and cupric oxide oxidation. The ethyl acetate–soluble degradation products were identified by combined gas chromatography‐mass spectrometry. The compounds released in the perborate and in the cupric oxide treatments are as would be expected from a polymer derived from glucose dehydration products. Such degradation patterns contrasted with those obtained by alkaline permanganate oxidation, which resembled those of humic‐ or lignin‐like substances.