| DBC-偶氮胂在水溶液中离解作用的研究 |
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| 引用本文： | 李红,蔡汝秀,曾云鹗.DBC-偶氮胂在水溶液中离解作用的研究[J].高等学校化学学报,1986,7(8):686. |
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| 作者姓名： | 李红 蔡汝秀 曾云鹗 |
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| 作者单位： | 武汉大学化学系 |
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| 摘 要： | 3-(2-胂酸基苯偶氮-6-(2,6-二溴-4-氯苯偶氮)-4,5-二羟基-2,7-萘二磺酸(简称DBC-偶氮胂)可在高酸度下(0.2-1.7NHCl)与稀土元素发生灵敏显色反应,且选择性非常好,前文已报导用该试剂直接光度测定高温合金中微量铈sup>1]。本文研究了DBC-偶氮胂在水溶液中的离解作用,用pH电位法及分光光度法测定DBC-偶氮胂及各级条件离解常数,结果表明:由于多卤素原子的引入,使试剂更易于质子化;因而离解常数比偶氮胂Ⅲ大。
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| 收稿时间： | 1985-05-04 |
Studies on the Dissociation of DBC-Arsenazo in Aqueous Solution |
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| Li Hong,Cai Ruxiu,Zeng Yun'e.Studies on the Dissociation of DBC-Arsenazo in Aqueous Solution[J].Chemical Research In Chinese Universities,1986,7(8):686. |
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| Authors: | Li Hong Cai Ruxiu Zeng Yun'e |
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| Institution: | Department of Chemistry, Wuhan University, Wuhai |
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| Abstract: | The dissociation of DBC-Arsonazo in aqueous solution was studied by spectro-phtometric and potentiometric litration meiricdr.The values of dissociation constants,pK1=0.70,pK2=1.68,pK3=2.76,pK4=6.54,pK5=9.64,pK6=10.54,were determined by spectrophotorr.ctric methods at the identical temperature and ionic strength (20℃,I=0.4).Under the identical conditions the results pK3=3.7,pK4=6.67,pK5=9.95,pK6=10.95,obtained by using the potentiometric titration method. |
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