偶氮氯膦(Ⅲ)-OP体系分光光度法测定铝合金中的铬  

Spectrophotometry determination of chromium(Ⅲ) in Al alloys with chlorophosphonazo(Ⅲ)-OP systems

作　　者：郭金全[1] 李富兰[1] 

机构地区：[1]四川理工学院材料与化学工程系,四川自贡643000

出　　处：《应用化工》2009年第2期304-306,共3页Applied Chemical Industry

摘　　要：研究了以偶氮氯膦(Ⅲ)为显色剂的分光光度法来测定铝合金样品中的铬含量。研究了测量波长、显色介质、酸度、显色剂加入量、温度、时间及干扰元素等对测量结果的影响。结果表明,室温下,在pH 4.5的HAc-NaAc介质中,偶氮氯膦(Ⅲ)与表面活性剂OP作用下在与Cr(Ⅲ)生成稳定蓝紫色络合物,该络合物在620 nm具有最大吸光度,该分光光度法测定精度高且快速准确。The spectrophotometry using chromium （ Ⅲ ） reagent as the color developing reagent has been studied. The effects of measuring wave length, addition of chromogenic agent, chromogenic media, acidity, temperature, time and interfering elements on the measured results were studied. The result shows that chlorophosphonazo （ Ⅲ ） can react with chromium （ Ⅲ ） to form a stable blue complex on surfactant OP in a medium containing HAc-NaAc. The complex has good absorbance at 620 nm, the method is accurate and efficient.

关 键 词：偶氮氯膦(Ⅲ) 铝合金 铬(Ⅲ) 分光光度法 

分 类 号：O657.32[理学—分析化学]