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EDTA-Zn作掩蔽剂,铬天青S测定铝,方法虽简便,但不很稳定。我们对方法作了一些改进,使方法稳定,可用于钢铁,部份有色金属、铁合金及矿石中铝的测定。试验部分一试剂铬天青S(CAS):0.1%乙醇(1+1)溶液, 缓浊液:六次甲基四胺4:50克,盐酸45ml稀至1000ml; EDTA-Zn:0.2M(pH4)。二酸度与显色的关系酸度不但影响铬天青S解离、Al-CAS络合物
EDTA-Zn as a masking agent, chromium Azurol S determination of aluminum, although the method is simple, but not very stable. We made some improvements to the method to make the method stable and can be used for the determination of aluminum in steel, some non-ferrous metals, ferroalloy and ore. Experimental part of a reagent chromazurol S (CAS): 0.1% ethanol (1 +1) solution, slow turbidity solution: hexamethylenetetramine 4:50 g, hydrochloric acid 45ml diluted to 1000ml; EDTA-Zn: 0.2M pH4). The relationship between acidity and color development Acidity not only affects the dissociation of chrome azurin S, Al-CAS complexes