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一、前言铝铁青铜要求测定铝(8～10%)和铁(2～4%)。常规的测定法都是预先分离后,分别用8—羟基喹啉法,R_2O_3差减法,苯甲酸盐法或分离后再以 EDTA完成滴定等测定铝的方法;测铁的方法有高锰酸钾法,重铬酸盐法,硫氰酸盐比色法等。这些方法操作复杂,费时较多。也有以磺基水杨酸为指示剂,在 pH1.2～1.5,加热时用 EDTA 直接滴定铁。
First, the preface Aluminum bronze requires determination of aluminum (8 ~ 10%) and iron (2 ~ 4%). Conventional determination methods are pre-separation, respectively, 8-hydroxyquinoline method, R_2O_3 subtraction method, benzoate method or separation and then complete the titration with EDTA and other methods of determination of aluminum; test methods of iron permanganate Potassium method, dichromate method, thiocyanate colorimetry and so on. These methods are complex and time consuming. There are also sulfosalicylic acid as an indicator, at pH1.2 ~ 1.5, titration with EDTA titration of iron directly.