| 3,5-Br_2-PADAP—IO_3~-—SCN~-三元离子缔合物测定微量IO_3~-的研究 |
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| 引用本文： | 李欣,寇宗燕,刘锡林.3,5-Br_2-PADAP—IO_3~-—SCN~-三元离子缔合物测定微量IO_3~-的研究[J].理化检验(化学分册),1998(3). |
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| 作者姓名： | 李欣 寇宗燕 刘锡林 |
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| 作者单位： | 甘肃教育学院化学系 兰州730000 |
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| 基金项目： | 甘肃省教委自然科学基金资助项目 |
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| 摘 要： | 研究了3,5-Br_2-PADAP在酸性介质中质子化。与IO_3~-和SCN~-形成三元离子缔合物的最佳条件,其表观摩尔吸光系数为1.4×10~5L·mol~(-1)·cm~(-1),缔合物组成比为3,5-Br_2-PADAP:IO_3~-:SCN=1:1:1。提供了测定微量IO_3~-的新方法,可用于加碘食盐及海带等样品中含碘量的测定,获得满意结果。
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| 关 键 词： | 3 5-Br_2-PADAP IO_3~- 吸光光度法 |
STUDY ON THE DETERMINATION OF MICROAMOUNT OF IO_3~- USING 2-(3,5-DIBROMO-2-PYRIDYLAZO)-5-DIETHYLAMINOPHENOL |
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| Li Xin,Kou Zongyan and Liu Xilin.STUDY ON THE DETERMINATION OF MICROAMOUNT OF IO_3~- USING 2-(3,5-DIBROMO-2-PYRIDYLAZO)-5-DIETHYLAMINOPHENOL[J].Physical Testing and Chemical Analysis Part B:Chemical Analgsis,1998(3). |
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| Authors: | Li Xin Kou Zongyan and Liu Xilin |
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| Abstract: | The optimum conditions of ion association of protonated 2-( 3, 5-dibromo-2-pyridylazo)-5-diethylaminophenol (3,5-Br_2-PADAP) with IO_3 and SCN~- formed in H_2SO_4 medium was investigated in this paper. The molar absorptivity is 1. 42 X 10~5L ?mol~(-1) ?cm~(-1) and the composition ratio of 3,5-Br_2-PADAP : IO_3~- : SCN~- is 1:1:1. A new method for the determination of microamount of IO_3~- was developed and applied to determine microamount of iodine in table salt with satisfactory results. |
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| Keywords: | 2-(3 5-dibromo-2-pyridylazo)-5-diethylaminopheuol IO_3~- Spectrophotometry |
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