微乳液介质5-Br-PADAP分光光度法测定钢样中的锰(Ⅱ)  

Determination of Mn(Ⅱ) in Steel and Aluminium Alloy with Microemulsion-5-Br-PADAP by Spectrophotometry

作　　者：吴丽香[1] 赵男[1] 

机构地区：[1]辽宁石油化工大学石油化工学院,辽宁113001

出　　处：《现代科学仪器》2008年第5期56-57,共2页Modern Scientific Instruments

摘　　要：以含水85%的油/水型微乳液(OP/正丁醇/正庚烷/水=10:4:1:85)为介质,2-(5-溴-2-吡啶偶氮)-5-二乙氨基苯酚(5-Br-PADAP)为显色体系分光光度法,测定钢样中的锰(Ⅱ),最大吸收波长位于568nm处,锰(Ⅱ)在0～8μg/10mL范围内服从比尔定律,表观摩尔吸收系数ε_(568)=1.178×10~5L·mol^(-1)·cm^(-1)。采用联合掩蔽剂消除了Ni^(2+)、Cu^(2+)、Ti^(2+)、Cd^(2+)、Zn^(2+)等离子的干扰,测定了抚顺钢厂的38CrMoAl、45#钢样中的锰(Ⅱ),其相对标准偏差RSD为0.72%、0.37%。加标平均回收率分剐为101.31%、97.85%。该方法灵敏度高,选择性好。Mn（Ⅱ） in steel and aluminium alloy was determined directly with the colorination system of 2 - （5 - Br-2- pyridylazo） -5- dethylaminophenol （5 -Br- PADAP） and o/w microemulsion contained 85% water by spectrophotometry. In the system of microemulsion- NH3 · H2O- NH4Cl buffer solution, Mn（Ⅱ） and 5- Br- PADAP form a steady complex compound, the absorption of this complex compound reaches maximum and the absorption was at 568 nm. Beer＇ s law was obeyed when the Mn（Ⅱ） amount was 0 -8μg/10mL, and the apparent molarabsorption coefficient was 1. 178 × 10^5 L mol^-1·cm^-1. The interference of Ni^2＋ ,Cu^2＋、 Ti^2＋ ,Cd^2＋ Zn^2＋ ions was eliminated by dimethylglyoxime, sodium fluoride and citric aeid,Mn（Ⅱ）content in Fushun steelworks＇38CrMoA1, 45# were determined by this method, which RSD is 0.72% ,0.37% . The average recovery rate is 101.31%, 97.85% . The results indicated that the method has many advantages such as high sensitivity and high selectivity.

关 键 词：微乳液 5-Br—PADAP 分光光度法 钢样 Mn(Ⅱ) 

分 类 号：TG115.33[金属学及工艺—物理冶金]