| Autor: |
KERVEN, G. L., EDWARDS, D. G., ASHER, C. J. |
| Zdroj: |
Soil Science; February 1984, Vol. 137 Issue: 2 p91-99, 9p |
| Abstrakt: |
In acid peaty soils most of the copper in the soil solution is present as organic complexes. This paper describes methods for measuring total soil solution copper by flameless atomic absorption spectroscopy and estimating the proportion of this copper that is complexed using copper titration and a copper ion selective electrode. With these acidic peats of diverse origin, total copper in solution at natural pH values (3.4 to 3.5) ranged from 0.14 to 0.2 μM. Of this, 60 to 90 was complexed. Raising the pH of aqueous extracts to about 6.0 increased the degree of complexation of soluble copper in extracts of all three peats to >98. We discuss the results in relation to current thinking about the nature of copper complexation by humic and fulvic acids. |
| Databáze: |
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