Imaging of humic substance macromolecular structures in water and soils

Satish Chandra Babu Myneni, J. T. Brown, G. A. Martinez, W. Meyer-Ilse

Research output: Contribution to journalArticlepeer-review

268 Scopus citations


Humic substances (HSs) are the natural organic polyelectrolytes formed from the biochemical weathering of plant and animal remains. Their macromolecular structure and chemistry determine their role in biogeochemical processes. In situ spectromicroscopic evidence showed that the HS macromolecular structures (size and shape) vary as a function of HS origin (soil versus fluvial), solution chemistry, and the associated mineralogy. The HSs do not simply form coils in acidic or strong electrolyte solutions and elongated structures in dilute alkaline solutions. The macromolecular structural changes of HSs are likely to modify contaminant solubility, biotransformation, and the carbon cycle in soils and sediments.

Original languageEnglish (US)
Pages (from-to)1335-1337
Number of pages3
Issue number5443
StatePublished - Nov 12 1999

All Science Journal Classification (ASJC) codes

  • General


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