| 黑荆树单宁与金属离子络合性质的研究 |
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| 引用本文： | 苏小宝,戴丽君,陈少平,卢玉栋,吴宗华.黑荆树单宁与金属离子络合性质的研究[J].林产化学与工业,2007,27(4):37-41. |
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| 作者姓名： | 苏小宝 戴丽君 陈少平 卢玉栋 吴宗华 |
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| 作者单位： | 福建师范大学,化学与材料学院,福建,福州,350007 |
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| 基金项目： | 福建省科技厅重点项目资助(2005I007) |
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| 摘 要： | 采用pH电位滴定法测定了不同温度下,离子强度(I)0.1 mol/L的NaCl溶液中单宁酸、橡椀单宁、黑荆树单宁的加质子常数和若干金属络合物稳定常数,考察了单宁结构单元对Fe3 、Cu2 、Zn2 、Ni2 的离子络合选择性的影响,讨论了影响加质子常数和稳定常数的因素。研究结果表明,实验温度下单宁对Fe3 、Cu2 的络合稳定常数大小为:黑荆树单宁>橡椀单宁>单宁酸,对Zn2 、Ni2 的络合稳定常数大小为:橡椀单宁>黑荆树单宁>单宁酸。升高温度有利于酚羟基的解离但不利于单宁-金属络合物的形成。用柱层析提纯的黑荆树单宁对其金属络合物的稳定常数的影响不大。
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| 关 键 词： | 单宁 pH电位滴定 加质子常数 稳定常数 金属离子 |
| 文章编号： | 0253-2417（2007）04-0037-05 |
| 修稿时间： | 2006-05-08 |
Study on Complexation Properties of Black Wattle Tannin with Metals Ions |
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| SU Xiao-bao,DAI Li-jun,CHEN Shao-ping,LU Yu-dong,WU Zong-hua.Study on Complexation Properties of Black Wattle Tannin with Metals Ions[J].Chemistry & Industry of Forest Products,2007,27(4):37-41. |
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| Authors: | SU Xiao-bao DAI Li-jun CHEN Shao-ping LU Yu-dong WU Zong-hua |
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| Institution: | College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007, China |
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| Abstract: | Protonation constants and metal-complex stability constants of tannic acid,valonea tannin and black wattle tannin were determined by pH potentiometric titration under different temperatures in ionic strength I=0.1 mol/L NaCl solution.The complexation selectivities of different structures of tannins with Fe3 ,Cu2 ,Zn2 ,Ni2 ions were investigated and factors affecting protonation constant and stability constant were discussed.The results showed that the order of stability constants of the tannins complexed with Fe3 ,Cu2 ions was:black wattle tannin>valonea tannin>tannic acid,and that of tannins with Zn2 ,Ni2 ions was:valonea tannin>black wattle tannin> tannic acid.The rise of temperature was favorable for disassociation of phenol hydroxyl but unfavorable for the formation of complex.The purification of black wattle tannin by gel column chromatography showed little effect on the complex stability constants. |
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| Keywords: | tannin pH potentiometric titration protonation constant stability constant metal ions |
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