一些不对称变色酸双偶氮类显色剂的结构及其与稀土元素显色反应性能的研究

一些不对称变色酸双偶氮类显色剂的结构及其与稀土元素显色反应性能的研究 STUDIES ON THE CONSTITUTIONS AND REACTING PROPERTIES OF SOME UNSYMMETRIC BISAZO REAGENTS OF CHROMOTROPIC ACID WITH RARE EARTH ELEMENT 余席茂 first-author 蔡汝秀 梁汉琼 本文研究了不对称变色酸双偶氮类试剂中不同分折功能团、助色团及其不同取代位置对试剂与稀土元素显色反应性能的影响,设计和合成了数十个试剂,研制出了性能优良的铺组稀土显色剂——对乙酰基偶氮肿。对乙酰基偶氮胂具有: （1）灵敏度高,摩尔吸光系数ε 670nm =1.03-1.16×10 5 （La—Nd）. （2）选择性好,常见元素的允许量为:Ca 2+ （0.5毫克）,Ni 2+ （14）,Mg 2+ （100）,Mn 2+ （16）,Cr 3+ （2）,V 5+ （2）,Nb 5+ （5）,W 6+ （1）.加入掩蔽剂,选择性还可进一步提高。对乙酰基偶氮胂可在钇组稀土存在下,不经分离直接测定铺组稀土含量。对乙酰基偶氮胂可广泛应用于合金钢、矿石、土壤中铺组稀土的测定。 The effects of different analytical functional groups, auxochromie groups and different substituted positions of bisazo chromotropic acid toward the color reaction have been studied in this paper. We synthesized and studied a series of new color reagent, and found that p-acetylarsenazo is the best reagent of Ce-group rare earth. It is highly sensitive and selective, molecular absorption coefficient ε 870（nm） =1.03-1.16×10 5 （La—Nd）.The complexes arc very stable. The following foreign ions are tolerated（mg）: Ca 2+ （0.5）, Mg 2+ （100）, Mn 2+ （16）, Cr 3+ （2）, V +5 （2）, Nb +5 （5）,W +8 （1）. In the presence masking agent, the selective is better. In the presence Yb-group rare earth, this reagent has been used to determine micro Ce-group rare earth in alloy steel by direct spectrophotometry. 1984-01-01 2021-04-01 1