| 光谱学与光谱分析 |
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| Study of the pH Sensitive Polymer |
| GUO Liang-qia, XIE Zeng-hong*, LIN Xu-cong, ZHENG Xiang-hua, ZHANG Mao-sheng, CHEN Guo-nan |
| Institute of Food Safety and Environment Monitoring, Fuzhou University, Fuzhou 350002, China |
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Abstract A pH sensitive polymer was prepared by copolymerization of methacrylic acid as monomer, diethylene glycol dimethacrylate as cross-linking reagent, heptane as porogen, and fluorescent dye eosin as indicator. The factors of influence on the preparation, and the character of the pH sensitive polymer for pH were studied. The maximal emission wavelength of eosin was red shifted in the polymer than in solution, the apparent Ka largened, and the dissociation equilibrium of indicator was shifted to acidity direction, because the polarity of polymer diminished. Under the optimal condition, the calibration curve of the pH sensitive polymer covered the range of pH 0-3.0 with good reproduction and reversibility.
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Received: 2004-12-28
Accepted: 2005-05-18
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Corresponding Authors:
XIE Zeng-hong
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