【摘要】 <正>有人曾研究过铋与吡啶偶氮类显色剂的显色反应,但3,5-二溴吡啶偶氮间氨基酚(PAAP)却不曾被研究。本文研究以Bi-PA-AP-OP体系分光光度法测定微量铋。实验结果表明,本法灵敏度较某些有表面活性剂参与的三元体系的灵敏度高,摩尔吸光系数ε=3.26×10~4,比吸光度a=0.40。本法虽不及离子缔合萃取光度法灵敏,但避免了使用有机溶剂萃取,可防止污染及简化操作。更多还原

【Abstract】 A sensitive method lor the spectrophotometric determination ot Bi with 3,5-DiBr-pyridylazo-m-aminophenol and OP is studied. In the presence of OP, The Bi forms colouring complex with 3,5-Br2-PAAP at pH3 (HNO3). The maximum absorption of the complex is at 566nm. The molar absorption coefficient is 8.26×l04. The Lanmbert-Beer’ law holds for the Bi concentrations in the range from 0 to 50ug in 25ml.The method can be used in the rapid determination of micro amounts of Bi in metal materials.更多还原