Citation: YANG Shi-Feng, DUAN Hua-Ling, LIN Ji-Jun, ZHU Jian-Ying, GONG Zhen-Bin. A New Method for the Measurement of Complexation Stability Constant and Average Coordination Number of Metallic Element with Polymer[J]. Chinese Journal of Inorganic Chemistry, ;2014, 30(4): 853-859. doi: 10.11862/CJIC.2014.102 shu

A New Method for the Measurement of Complexation Stability Constant and Average Coordination Number of Metallic Element with Polymer

1.
1 State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen, Fujiang 361102, China;

Corresponding author: GONG Zhen-Bin,
Received Date: 15 September 2013
Available Online: 5 November 2013
Fund Project: 厦门大学近海海洋环境科学国家重点实验室自主创新项目(MELRI0703)资助项目。 (MELRI0703)

Anew method using gel filtration chromatography (GFC) and inductively coupled plasma mass spectrometry (ICPMS) was developed for the measurement of complexation stability constant and average coordination number of the complex of metallic ion with polymer. As an example, the binding of PEI with Cu²⁺ was shown and investigated. The macromolecular PEI-Cu complex and micromolecular species of Cu(Ⅱ) were firstly separated by a low efficiency GFC column with a mobile phase of 0.02 mol·L^-1 HAc-NaAc buffer, and then directly introduced into ICPMS for elemental analysis. The results of complexation stability constant and average coordination number characterized by putting the concentration of different species of metallic element into the equations of the novel chemical equilibrium model which was developed in this study. The results shown that the complexation stability constants (KPEI-Cu) were between 10^9.6 and 10^10.7 and the average coordination numbers (n) were in the range of 1.0~1.3 when pHwas changed from 4.1 to 5.3 at 25 ℃. This online, rapid and accurate method of GFC-ICPMS is a novel technique for the research of polymer-metallic complex.
- gel filtration chromatography;inductively coupled plasma mass spectrometry;PEI-Cu complex;complexation stability constant;average coordination number
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