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Science 22 September 1967:
Vol. 157. no. 3795, pp. 1429 - 1431
DOI: 10.1126/science.157.3795.1429
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Articles

Sodium Humate Solution Studied with Small-Angle X-Ray Scattering

R. L. Wershaw 1, P. J. Burcar 1, C. L. Sutula 2, and B. J. Wiginton 2

1 U.S. Geological Survey, Denver, Colorado 80225
2 Denver Research Center, Marathon Oil Company, Littleton, Colorado 80120

Small-angle x-ray scattering analyses of sodium humate solutions indicate either that particles of two or more different sizes exist in solution or that all of the particles are the same size but consist of a dense core and a less dense outer shell. Fractionation on a molecular sieve chromatographic column suggests that the first possibility is the more likely of the two. The radius of gyration and molecular weight of the larger particles are respectively 110 Å and 1 x 106 and those of the smaller particles 38 Å and 2.1 x 105. These particles are ellipsoidal.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)