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ABSTRACT
Lyophilized alkaline extracts from a Black Chernozem (Udic Haploboroll) Ah horizon were scanned in a scanning electron microscope. The micrographs obtained show the physical associations of organic and mineral matter before and after acidification and purification. A large percentage of the organoclay mineral complexes present in humic acids is probably formed during acidification.
1 Contribution from Research Station, Research Branch, Agriculture Canada, Lethbridge, Alberta T1J 4B1.
Received for publication January 18, 1974. Accepted for publication May 6, 1974.
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