微乳液介质分光光度法测定钢样中的锰(Ⅱ)  

Determination of Mn(Ⅱ)in steel by microemulsion-5-Br-PADAP spetrophotometry

作　　者：吴丽香[1] 宋官龙[1] 赵男[1] 

机构地区：[1]辽宁石油化工大学石油化工学院,辽宁抚顺113001

出　　处：《分析仪器》2008年第3期45-47,共3页Analytical Instrumentation

摘　　要：研究了以含水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)为显色剂,采用分光光度法测定钢样中的锰(Ⅱ),最大吸收波长位于568nm处,表观摩尔吸收系数ε568=1.178×10~5L·mol^(-1)·cm^(-1)。锰(Ⅱ)在0～8μg/10ml范围内服从比尔定律,采用联合掩蔽剂消除了镍(Ⅱ)、铜(Ⅱ)、钛(Ⅱ)、锌(Ⅱ)等离子的干扰,测定了抚顺钢厂的38CrMoAl、45#钢样中的锰(Ⅱ),其RSD为0.72%、0.37%。加标平均回收率分别为101.31%、97.85%。该方法灵敏度高,选择性好,结果满意。Mn（Ⅱ） in steel samples was determined by spectrophotometry using oil/water solution （containing 85% water） microemulsion as buffer and 2-（5-Br-2-pyridylazo）-5-dethylaminophenol（5-Br-PADAP） as coloring system. In microemulsion-NH3 H2O-NH4Cl buffer solution, Mn（Ⅱ） and 5-Br-PADAP formed a steady complex compound. The maxinum absorption of the compound was at 568nm. Beer＇s law was obeyed when the content of Mn（Ⅱ） was in the range of 0-8μg/10mL. The apparent absorption coefficient was 1.17 × 10^5L /（mol ·cm）. The interference of Ni^2＋, Cu^2＋, Ti^2＋ ,Cd^2＋ and Zn^2＋ ions was eliminated by combined suppressor of dimethylglyoxime, sodium fluoride and citric acid. Mn（Ⅱ） in samples of 38CrMoAl steel and 45 # steel （produced by Fushun Steelworks） were determined. The RSDs were 0. 72% and 0. 37% , and the recoveries were 103. 31% and 97. 85% for 38CrMoAl steel and 45 # steel, respectively.

关 键 词：微乳液 5-BR-PADAP 分光光度法 钢样 Mn(Ⅱ) 

分 类 号：TG115.335[金属学及工艺—物理冶金]