【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=1.178×10⁵L·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。更多还原

【Abstract】 Mn（Ⅱ）in steel samples was determined by spectrophotometry using oil/water solution（containing 85% wa- ter）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 1.17×10⁵ L/（mol·cm）.The interference of Ni²⁺,Cu²⁺,Ti²⁺,Cd²⁺ and Zn²⁺ ions was eliminated by combined suppressor of dimethylglyoxime,sodium fluoride and citric acid.Mn（Ⅱ）in samples of 38CrMoAI 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.更多还原