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本文研究了甲基百里酚蓝(MTB)光度法测定铝的条件和影响碱性分离铝的因素。结果表明:在乙醇存在和加热条件下.pH2.3～3.5范围内铝和MTB形成1:1络合物,摩尔吸光系数1.4×10~4,K_(不稳)4.17×10~(-8),离解度6.25％,Al_2O_3在0～350微克/100毫升符合比尔定律,有色络合物稳定10小时以上。基于MTB分子中甲胺二乙酸螯合基的作用,络合物有一个五元环和二个五元环两种互变异构体,其最大吸收分别为585nm和575nm,等吸收点560nm。为使铝定量转入溶液中,氢氧化
In this paper, the conditions of aluminum determination by methyl thymol blue (MTB) spectrophotometry and the factors affecting the alkaline separation of aluminum were studied. The results showed that aluminum and MTB formed 1: 1 complex in the range of pH 2.3 ~ 3.5 in the presence and heating of ethanol, the molar absorption coefficient was 1.4 × 10 ~ 4, K_ (unstable) was 4.17 × 10 ~ (-8) ), 6.25% of dissociation, Al_2O_3 in the range of 0 ~ 350 μg / 100 ml, Beer’s law was obeyed and the colored complex was stable for more than 10 hours. Based on the role of chelating group of methanamine diacetic acid in MTB molecule, the complex has a five-membered ring and two five-membered ring tautomers, the maximum absorption is 585nm and 575nm respectively, and the isoabsorption point is 560nm. In order to quantitatively transfer the aluminum into the solution, hydrogenation is carried out