
%0 Journal Article
%A Maguire, M 
%A Slavek, J 
%A Vimpany, I 
%A Higginson, FR 
%A Pickering, WF 
%T Influence of pH on copper and zinc uptake by soil clays
%J Soil Research
%D 1981/12/01
%V 19
%N 3
%P 217-229
%K 
%R https://doi.org/10.1071/SR9810217
%U https://www.publish.csiro.au/paper/SR9810217 
%X Nine soil clays were isolated from a wide range of soil horizons in New South Wales, and after minerological characterization, the adsorptive behaviour of the NH4+ form of the organic-free material was examined. The amount of copper and zinc sorbed increased with pH and, prior to precipitation of hydroxy species material, differences in pH-dependent capacity were discernible, reflecting differences in clay composition. Uptake at a fixed pH (5) did not always vary with concentration in accordance with Langmuir isotherms. Calculated parameters for amenable systems were similar to those observed by other workers, but capacities at a fixed pH proved to be less informative than pH dependence curves. The implications of the data for availability of the metal ions in the environment have been considered. 
