Electron spin resonance spectroscopy of commercial HUMIC acids in comparison with natural HUMIC acids extracted from soil and some naturally decomposed agriculture wastes

Other Title(s)

استخدام طيف الرنتن المغزلي الإلكتروني في المقارنة بين أحماض الهيوميك التجارية و أحماض الهيوميك الطبيعية المستخلصة من التربة الزراعية و بعض المخلفات الزراعية المتحللة

Joint Authors

al-Amir, Asma
Ibrahim, Majdah Husayn

Source

Assiut University Bulletin for Environmental Researches

Issue

Vol. 21, Issue 1 (31 Mar. 2018), pp.59-74, 16 p.

Publisher

Assiut University Center for Environmental Studies and researches

Publication Date

2018-03-31

Country of Publication

Egypt

No. of Pages

16

Main Subjects

Earth Sciences, Water and Environment
Agriculture

Topics

Abstract EN

Concentration of free radicals, g-values, and line widths of the ESR spectra were determined for three commercial humic acids used for agriculture in Egypt and compared with three natural humic acids extracted from soil and two decomposed agricultural wastes including olive mill solid residual and rice straw - cattle manure mixture.

The natural regional soil humic acid shows lower free electron contents.

The calculated free radical contents of the commercial humic acids were found to be abnormally higher than not only the studied natural humic acids but also than the cited literature humic acids originated from different sources.

All the g-values indicate semiquinonic radical moieties associated with an aromatic network or a semiquinone radical unit conjugated to aromatic rings of different type.

Higher g- values recorded for the studied humic acids indicate oxygen-centered radicals.

The relations govern the line-width and g-value, the line-width and the shape of the esr signal, spin concentration and %O, spin concentration and % H, spin concentration and absorbance at 465 nm., spin concentration and atomic C/H ratios are more significant in case of natural humic acids extracted from soil and the two composts but not in case of commercial humic acid.

This indicates that the two humic acids classes are basically different in their structures.

American Psychological Association (APA)

Ibrahim, Majdah Husayn& al-Amir, Asma. 2018. Electron spin resonance spectroscopy of commercial HUMIC acids in comparison with natural HUMIC acids extracted from soil and some naturally decomposed agriculture wastes. Assiut University Bulletin for Environmental Researches،Vol. 21, no. 1, pp.59-74.
https://search.emarefa.net/detail/BIM-835902

Modern Language Association (MLA)

Ibrahim, Majdah Husayn& al-Amir, Asma. Electron spin resonance spectroscopy of commercial HUMIC acids in comparison with natural HUMIC acids extracted from soil and some naturally decomposed agriculture wastes. Assiut University Bulletin for Environmental Researches Vol. 21, no. 1 (Mar. 2018), pp.59-74.
https://search.emarefa.net/detail/BIM-835902

American Medical Association (AMA)

Ibrahim, Majdah Husayn& al-Amir, Asma. Electron spin resonance spectroscopy of commercial HUMIC acids in comparison with natural HUMIC acids extracted from soil and some naturally decomposed agriculture wastes. Assiut University Bulletin for Environmental Researches. 2018. Vol. 21, no. 1, pp.59-74.
https://search.emarefa.net/detail/BIM-835902

Data Type

Journal Articles

Language

English

Notes

Includes bibliographical references : p. 70-73

Record ID

BIM-835902