Analysis of the Effects of Humic Acid Extracted from the Tama River Sediment on the Pseudokirchneriella subcapitata Growth Inhibition by Copper by NICA (non-ideal competitive adsorption) -Donnan model

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In this study, the effects of humic acid on algal growth inhibition by copper were quantitatively investigated. First, the binding of proton and cupric ions to three types of binding site in humic acid were analyzed using the NICA (non-ideal competitive adsorption)-Donnan Model. The model developed was used to predict the binding of cupric ions to humic acid at various pHs. Then, the effects of humic acid on the inhibition of Pseudokirchneriella subcapitata growth by copper were examined. In terms of effects of humic acid on such growth inhibition of P. subcapitata, humic acid in the Tama river sediment was different from commercial humic acid. In conclusion, humic acid in the Tama river sediment has a similar property to fulvic acid. Particularly, the contribution of copper binding the phenolic site in humic acid to algal growth inhibition caused by copper toxicity is large compared with that of the copper binding the three binding sites, i.e. the phenolic and carboxylic sites and the Donnan phase in humic acid.