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应用双波长分光光度法同时测定了金属铝中微量钛和铁。用磺基水杨酸作为显色剂,可使钛和铁在同一实验条件下迅速完成显色反应,并且两络合物的测定灵敏度之比与金属铝中钛和铁的含量之比相适应。采用影响系数和混合标准溶液校正,以消除组份间的光谱干扰和络合物分子间的相互影响及电学系统漂移的影响,测定含钛0.004—0.0145％,铁0.14—0.25％的相对标准偏差分别为钛9.3—22％,铁3.4—6.1％。方法的测定范围:钛0.004—0.x％,铁0.0x—x％。试剂和仪器钛、铁标准溶液:按常规方法配制成每毫升含10微克钛和每毫升含100微克铁的标准溶液;磺基水杨酸溶液:25％水溶液;缓冲溶液:pH≈3的乙酸-乙酸钠缓冲溶液;QR-50型分光光度计与EL-522型可编程序计算器。
Simultaneous Determination of Trace Titanium and Iron in Aluminum by Dual - wavelength Spectrophotometry. With sulfosalicylic acid as a chromogenic agent, titanium and iron can be quickly under the same experimental conditions to complete the color reaction, and the determination of the ratio of the two complexes with metal aluminum ratio of the ratio of titanium and iron content to adapt . The relative standard deviation of 0.004-0.0145% of titanium and 0.14-0.25% of iron were determined by using the influence coefficient and the correction of mixed standard solution to eliminate the spectral interference between components and the interactions between the complexes and the drift of the electrical system. They are 9.3-22% titanium and 3.4-6.1% iron, respectively. The method of determination of the range: titanium 0.004-0.x%, iron 0.0x-x%. Reagents and Instruments Titanium and iron standard solutions: Standard solutions containing 10 micrograms of titanium per milliliter and 100 micrograms of iron per milliliter were prepared by conventional methods; sulfosalicylic acid solution: 25% aqueous solution; Buffered solution: acetic acid pH≈3 - sodium acetate buffer solution; QR-50 spectrophotometer and EL-522 programmable calculator.