Effects of ionic strength and pH on the stability constants of the complex of Co(II) with soil fulvic acid |
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| Authors: | W M Dong W J Li H Q Zhang X D Wang Z J You C Y Zhou J Z Du Z Y Tao |
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| Institution: | (1) Radiochemistry Laboratory, College of Chemistry and Chemical Engineering, Lanzhou University, 730000 Lanzhou, P. R. China;(2) China Institute for Radiation Protection, 030006 Taiyuan, P. R. China |
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| Abstract: | The stability constants for tracer concentrations of Co(II) complexes with the red earth fulvic acid were determined at pH
3.8–6.8 and ionic strength 0.0010–1.0 mol/l by using the cation exchange equilibrium method and the radiotracer60Co. The effects of ionic strength and pH on the stability constants of 1∶1 Co(II) complexes were investigated, and it was
found that the stability constants of complexes of humic substances do not vary with ionic strength and pH in a manner similar
to that of simple complexes. |
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