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Determination of the dissociation constants of polyepoxysuccinic acid

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Abstract

The dissociation constants of polyepoxysuccinic acid (PESA) were investigated in this study. Based on the potentiometric titration and the BEST program, the dissociation constants of PESA were determined. Considering the complexity of the dissociation of PESA in aqueous solution, several models were constructed to simulate the dissociation process of PESA. By comparison, the dissociation constants of PESA were obtained with model 4. The species distribution of PESA in aqueous solution as a function of pH was also presented according to the experimental and calculation results. It showed that the H2L model with five basic structure units to describe the dissociation of PESA was reasonable, and the relevant constants had less error and better matching between the experimental and calculation data. The corresponding values of pK ai were 4.68 and 4.92, respectively, for H2L at 35°C with ionic strength of 0.1 mol/L.

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Authors and Affiliations

  1. State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai, 200092, China

    Lihua Zhang, Zhiliang Zhu, Yanling Qiu, Ronghua Zhang & Jianfu Zhao

  2. Chemistry and Biology Engineering Department, Sanming College, Sanming, 365004, China

    Lihua Zhang

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  1. Lihua Zhang
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  2. Zhiliang Zhu
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  3. Yanling Qiu
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  4. Ronghua Zhang
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  5. Jianfu Zhao
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Correspondence to Zhiliang Zhu.

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Zhang, L., Zhu, Z., Qiu, Y. et al. Determination of the dissociation constants of polyepoxysuccinic acid. Front. Environ. Sci. Eng. China 2, 505–508 (2008). https://doi.org/10.1007/s11783-008-0077-x

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  • DOI: https://doi.org/10.1007/s11783-008-0077-x

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