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A THERMODYNAMIC STUDY OF Cu⁺⁺-Zn⁺⁺ ION EXCHANGE IN THE NITELLA FLEXILIS CELL WALL

P. VAN CUTSEM and C. GILLET
Plant and Soil
Vol. 62, No. 3 (1981), pp. 367-375
Published by: Springer
Stable URL: http://www.jstor.org/stable/42935409
Page Count: 9
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A THERMODYNAMIC STUDY OF Cu⁺⁺-Zn⁺⁺ ION EXCHANGE IN THE NITELLA FLEXILIS CELL WALL
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Abstract

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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