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A thermodynamic study of Cu++−Zn++ ion exchange in theNitella flexilis cell wall

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Summary

Exchange isotherms of Cu2+ vs Zn2+-ions were performed on the cell wall of a fresh water alga,Nitella flexilis. The relevant thermodynamic parameters are calculated. The cell wall absorbs copper selectively. The selectivity is explained by a stronger chelation of the cupric ion, due to the Jahn-Teller effect. The wall acts like a two-site model, based on the nature of the ligands: a first group of aminesites reacts exothermically and a second of hydroxylic-carboxylic sites of lower affinity, reacts endothermically.

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  1. Département de Biologie Végétale, Facultés Universitaires de Namur, Rue de Bruxelles 61, 5000, Namur, Belgique

    P. Van Cutsem & C. Gillet

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  1. P. Van Cutsem
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  2. C. Gillet
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Van Cutsem, P., Gillet, C. A thermodynamic study of Cu++−Zn++ ion exchange in theNitella flexilis cell wall. Plant Soil 62, 367–375 (1981). https://doi.org/10.1007/BF02374134

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  • DOI: https://doi.org/10.1007/BF02374134

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