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Citation: ZHU Zhi-Liang, LIANG Xiao-Ming, ZHANG Rong-Hua, ZHANG Hua, QIU Yah-Ling. Determination of Stability Constants of PASP Complexes with Ca²⁺ and Mg²⁺ in Aqueous Solution by pH Potentiometric Titration[J]. Chinese Journal of Applied Chemistry, ;2006, 23(4): 366-369. shu

Determination of Stability Constants of PASP Complexes with Ca²⁺ and Mg²⁺ in Aqueous Solution by pH Potentiometric Titration

1.
a State Key Laboratory of Pollution Control and Resource Reuse;
2.
b Chemistry Department, Tongji University, Shanghai 200092

Corresponding author: ZHU Zhi-Liang,
Received Date: 12 July 2005
Available Online: 3 October 2005
Fund Project: 国家自然科学基金(50478103) (50478103)科技部-小城镇科技发展重大项目(2003BA808A17)资助课题 (2003BA808A17)

By means of pH potentiometric titration,the dissociation equilibrium of polyaspartic acid(PASP) and its complexation with two divalent cations(Ca²⁺,Mg²⁺) were studied.Considering the complexity of the dissociation of polyaspartic acid in aqueous solution,a proper model of PASP(H₄L) was constructed to simulate the dissociation process of PASP.The computer program BEST developed by A.E Martell was used to determine the dissociation constants of PASP and the stability constants of the related PASP complexes with Ca²⁺ or Mg²⁺.According to the experimental and computation results,the distributions of PASP complex species in aqueous solution at different pH values were given out.The dissociation constants pK_ai of PASP were 2.27,3.66,4.22,and 5.40 respectively with an erroe of 0.006 1.The stability constants (lgβ) of PASP with Ca²⁺ or Mg²⁺ ranged from 2.97 to 13.15.The results show that PASP is a good ligand for forming different complexes with Ca²⁺ or Mg²⁺ under a wider range pH.
- pH potentiometric titration,
- polyaspartic acid(PASP),
- coordination chemistry,
- calcium ion,
- magnesium ion
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Determination of Stability Constants of PASP Complexes with Ca2+ and Mg2+ in Aqueous Solution by pH Potentiometric Titration

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通讯作者: 陈斌, bchen63@163.com

Determination of Stability Constants of PASP Complexes with Ca²⁺ and Mg²⁺ in Aqueous Solution by pH Potentiometric Titration