摘要
研究了分光光度法在测定钛铝合金中微量锑的应用。试样以硫酸溶解，在０５ｍｏｌ／Ｌ～０９ｍｏｌ／Ｌ硫酸介质中，五价锑被抗坏血酸、硫脲联合还原为三价锑，三价锑与碘化钾、铀试剂（５－Ｂｒ－ＰＡＤＡＰ）形成三元离子配合物，该配合物可被苯萃取后于分光光度计６２０ｎｍ处测量吸光度，借以确定钛铝合金中０２０％以下含量的锑。在确定的条件下钛铝合金元素、常见杂质元素及磷、碲等均不干扰锑的测定。通过对合成样品的分析表明，该方法简便，结果准确可靠，相对标准偏差为１％～２％。
A 2-(5-Bromo-2-pyridylazo)-5-diethylaminopenol (5-Br-PADAP) extraction spectrophotometric method has been developed for the determination of trace antimony content in titanium-aluminium(TiAl) alloys In a medium of dilute sulphuric acid(05～09mol/L H2SO4), five-valent antimony was reduced to tervalent antimony by ascorbic acid and thiourea Sb( Ⅲ) reacted with potassium iodide and 5-Br-PADAP to form a three-part ionic coordination compound, The compound was extracted by benzol, separated from other ions, and determined by spectrophotometer It is found that the coordination compound shows maximum absorbance at 620nm Beer′s law is obeyed in the range of 0～20μg antimony in 10ml benzol The TiAl alloy matrix elements and common impurity elements do not influence the determination of Sb under the condition selected The method has been successfully applied to the determination of antimony in synthetic samples containing 010% and 0020% Sb, respectively, with an RSD of 1%～2% The method is simple and accurate, and can be used for the determination of antimony in the range of 002%～020% in TiAl alloy
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
1997年第6期56-59,共4页
Rare Metal Materials and Engineering
关键词
钛铝合金
锑
分光光度法
铀试剂
titanium-aluminium alloy, antimony, spectrophotometry, 5-Br-PADAP
