Abstract
The adsorption of oxalic, phthalic, salicylic, and lactic acids on goethite from 0.53 M NaCl and from synthetic major ion sea water is examined to determine the effect of Mg, Ca, and SO/sub 4/ on the adsorption behavior of the organic compounds. The comparison shows that organic acid adsorption is suppressed in sea water relative to the NaCl system. Successive additions of SO/sub 4/, Mg, and Ca in their natural ionic proportions found in sea water to 0.53 M NaCl indicate that sulfate suppresses the adsorption of all the organic acids, especially in the low pH range. The addition of Mg also suppresses the adsorption of oxalic and phthalic acids while the addition of Ca suppresses lactic acid adsorption. The effect of SO/sub 4/, Mg and Ca on the adsorption of the organic acids is due to competition for available binding sites and the formation of solution complexes which either do not absorb or weakly absorb.
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