The Effect of Adsorbed Humic Substances on the Uptake of Copper(II) by Goethite*
نویسندگان
چکیده
The uptake of Cu by particles of goethite to which humic substances (HS) were adsorbed was measured as a function of pH at fixed Cu concentration, and as a function of [Cu] at pH 5.5, at an ionic strength of 0.01 mol dm-3• Uptake was enhanced, compared to that by goethite alone, in the pH range 4-7 and at [Cuz+] ::::; 10-5 mol dm-3• The results at pH 5.5 show that the enhancement is not due simply to the adsorbed HS increasing the concentration of particulate sites able to interact with Cu, but also to the creation of extra uptake sites of relatively high affinity when the goethite and HS interact.
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