| 用亲核取代法测定La(Ⅲ)—丹宁配合物的稳定常数 |
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| 引用本文： | 薛皎亮,刘贤超.用亲核取代法测定La(Ⅲ)—丹宁配合物的稳定常数[J].山西农业大学学报(自然科学版),1992,12(2):163-164. |
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| 作者姓名： | 薛皎亮 刘贤超 |
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| 作者单位： | 山西农业大学基础部 太谷 |
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| 摘 要： | 本文采用有色络合物—无色络合物竞争同一个金属离子的方法,用721分光光度计测定了它们光密度的变化,从而解出稀土La(Ⅲ)与丹宁配合物的稳定常数,即β_1=2.25×10~7,β_2=8.34×10~(14)。从结果看,它们形成配合物的稳定性较大,由此推测,当人体摄入稀土时,通过喝茶或吃含丹宁丰富的食物,将可防止稀土在人体中过量积累。
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| 关 键 词： | 稀土元素 丹宁 稳定常数 |
THE DETERMINATION OF THE STABLE CONSTANT OF THE COMPLEX COMPOUND OF LA (Ⅲ)—TANNIN BY AFFINITY NUCLEUS REPLACEMENT |
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| Xue Jiaoliang Liu Xianchao.THE DETERMINATION OF THE STABLE CONSTANT OF THE COMPLEX COMPOUND OF LA (Ⅲ)—TANNIN BY AFFINITY NUCLEUS REPLACEMENT[J].Journal of Shanxi Agricultural University,1992,12(2):163-164. |
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| Authors: | Xue Jiaoliang Liu Xianchao |
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| Institution: | Shanxi Agricultural University |
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| Abstract: | The rule that colour—complex competing with uncolour—complex for a same metal ion was used. Potodensities were determined by 721 spectro hotometer and the stable constant of complex of La(Ⅲ)—Tannin were obtained, as following: β_1=2. 25×10~7, β_2=8.34×10~(14). The rcsults showed that the complex was more stable. There fore, when a man took the rarccarth elements into his body, the accumulation of rare—carth would he prevented by drinking tea or cating the food with tannin. |
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| Keywords: | Rare—carth clement Stable constant Tannin |
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