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An Evaluation of Aromatic Fraction in Humic Substances¹

ABSTRACT

The fraction of aromatic carbon (A_C) present in humic substances was reported to be determined by carbon magnetic resonance (CMR). A second method for determining A_C is based on the weights of aromatic degradation products obtained by permanganate oxidation of humics. A correct method of computing A_C from such data, not available so far, has been developed. A_C values thus calculated are found to be much lower than those determined by CMR. The probable cause for such discrepency may be the presence of rings with low aromaticity, like furans, in the structure of humic substances.

¹ Contribution from the College of Management, Georgia Inst. of Technology, Atlanta 30332. Supported by National Science Foundation Grant CME 80-08683.

² Visiting Assistant Professor, College of Management and Professor, School of Civil Engineering.

Received for publication March 11, 1983. Accepted for publication October 22, 1984.