Journal of Solution Chemistry

, Volume 35, Issue 9, pp 1303–1313 | Cite as

Thermodynamics of Aqueous Nitrilotriacetic Acid (NTA) Systems: Apparent and Partial Molar Heat Capacities and Volumes of Aqueous HNTA2−, NTA3−, MgNTA, CoNTA, NiNTA and CuNTA at 25 °C

  • Dzmitry Malevich
  • Zhongning Wang
  • Peter R. Tremaine
Original Paper


Apparent molar heat capacities and volumes have been determined for aqueous Na2HNTA, Na3NTA, NaMgNTA, NaCoNTA, NaNiNTA and NaCuNTA at 25 °C. The experimental results have been analyzed in terms of Young’s rule with an extended Debye–Hückel equation to obtain standard partial molar heat capacities C p o and volumes V o for the species HNTA2−(aq), NTA3−(aq), MgNTA(aq), CoNTA(aq), NiNTA(aq) and CuNTA(aq), at ionic strengths I = 0 and I = 0.1 mol⋅kg−1. Values of C p o and V o were combined with the literature data to estimate the stability constants of the NTA complexes at temperatures up to 100 °C.


Aqueous Apparent molar heat capacities Apparent molar volumes Standard partial molar properties Nitrilotriacetic acid NTA Transition metal—NTA complexes 


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© Springer Science + Business Media, Inc. 2006

Authors and Affiliations

  • Dzmitry Malevich
    • 1
    • 3
  • Zhongning Wang
    • 2
  • Peter R. Tremaine
    • 1
    • 2
  1. 1.Department of ChemistryUniversity of GuelphGuelphCanada
  2. 2.Department of ChemistryMemorial University of NewfoundlandSt. John’sCanada
  3. 3.RMC Fuel Cell Research CenterKingstonCanada

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