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篇目详细内容 |
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【篇名】 |
Determination of the dissociation constants of polyepoxysuccinic acid |
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【刊名】 |
Frontiers of Environmental Science and Engineering in China |
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【刊名缩写】 |
Front.Environ.Sci.Engin.China |
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【ISSN】 |
1673-7415 |
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【EISSN】 |
1673-7520 |
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【DOI】 |
10.1007/s11783-008-0077-x |
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【出版社】 |
Higher Education Press and Springer-Verlag |
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【出版年】 |
2008 |
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【卷期】 |
2
卷4期 |
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【页码】 |
505-508
页,共
4
页 |
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【作者】 |
ZHANG Lihua;
ZHU Zhiliang;
QIU Yanling;
ZHANG Ronghua;
ZHAO Jianfu;
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【关键词】 |
polyepoxysuccinic acid; dissociation constants; potentiometric titration; BEST program |
【摘要】 |
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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 pKai were 4.68 and 4.92, respectively, for H2L at 35°C with ionic strength of 0.1 mol/L. |
