INFLUENCE OF THE CLAY TYPES ILLITE AND MONTMORILLONITE ON THE UPTAKE OF65 Zn BY SCENEDESMUS OBLIQUUS. |
| |
| Authors: | P C KEULDER |
| |
| Institution: | Dept. of Botany , University of the O.F.S. , Bloemfontein, South Africa |
| |
| Abstract: | SUMMARY The stimulatory effect of the clays illite and montmorillonite on zinc uptake by Scenedesmus obliquus is discussed. The competitive effects of hydrogen, phosphate, magnesium and copper ions on zinc uptake are illustrated. This competition is reduced in the presence of illite and montmorillonite and zinc uptake is stimulated. Ferrous ions have no effect on zinc uptake, while calcium ions antagonize zinc uptake at high concentrations. The latter effect was remarkable in the presence of montmorillonite. |
| |
| Keywords: | Phosphorus loading seasonal variation nutrient diversion |
|
|
