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）为显色体系的分光光度法，测定铝合金中的锰（Ⅱ），在微乳液介质中锰（Ⅱ）最大吸收波长位于568nm处，锰（Ⅱ）在0-8μg/10mL范围内符从比尔定律，表观摩尔吸收系数ε568=1.178×105L/（mol.cm）。采用联合掩蔽剂消除Ni^2＋、Cu^2＋、Ti^2＋、Cd^2＋、Zn^2＋等离子的干扰，测定抚顺铝厂普铝、LD31铝合金样中的锰（Ⅱ），相对标准偏差RSD为0.92%、1.5%。加标回收率分别为97.86%、97.74%。该方法灵敏度高、选择性好。
Mn （Ⅱ ） in 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 this paper, the absorption of this complex compoundreaches maximunvalue and the absorption pcak is at 568nm. results show that Beer＇s law is obeyed when the Mn（Ⅱ ） amount is 0- 8μg/10mL, and the apparent molarabsorption coefficient is 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 acid,. Mn（ Ⅱ ） content in Fushun Aluminiumworks Pu Aluminium,LD31 were determined by the method, whose RSD is 0. 92% ,1.5%. the average recovery rate is 97.86% and 97.74%. the method has many advantages such as high sensitivity ,high selectivity.
出处
《现代仪器》
2007年第5期70-71,62,共3页
Modern Instruments
