Estimation of Surface Charge Density of Mica and Vermiculite by Competitive Adsorption of Diquat2+ vs. Paraquat2+
- 1 May 1970
- journal article
- Published by Wiley in Soil Science Society of America Journal
- Vol. 34 (3) , 527-531
- https://doi.org/10.2136/sssaj1970.03615995003400030045x
Abstract
Competitive adsorption of diquat2+ (1,1′‐ethylene‐2,2′‐dipyridinium ion) vs. paraquat2+ (1,1′‐dimethyl‐4,4′‐dipyridinium ion) by external surfaces of vermiculite and mica appeared to be linearly related to the surface charge densities of the adsorbents. This suggested a means for estimating surface charge of soil layer silicates. Soil clays, treated for removal of free iron and kaolin, exhibited surface charge densities in the range 7.3–8.7 × 104 esu/cm2.Keywords
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