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为适用炉前快速测定铝的方法需要,我们试验了在硝酸或硝盐混酸介质里,在抗坏血酸及乙酸—乙酸铵缓冲溶液存在下,铝与铬天青S的显色反应。试验结果证明:该络合物的最大吸收波长在545nm处;在50ml显色液中,HCl、HNO_3或HClO_4的量分别为0.02～0.20ml时,有色络合物的吸光度基本一致;多至5mgNi(Ⅱ)、Co(Ⅱ)、Mn(Ⅱ),1mgW(Ⅵ)、Mo(Ⅵ)不干扰Al的测定。Fe(Ⅱ)、Cu(Ⅱ)、Cr(Ⅲ)有负干扰,显色时可补至同量以消除干扰,Ti(Ⅳ)的正干扰可加入Fe(Ⅲ)予以消除,当显色液中Fe(Ⅲ)量为5mg和10mg时多至0.03mg和0.08mgTi对结果影响不大。络合物发色速度快,3分钟内吸光度基本稳定。铝含量范围在2.5～35μg/50ml符合比尔定律,有色络合物的摩尔
In order to apply the method of rapid determination of aluminum in the furnace, we tested the color reaction of aluminum with chrome azurin S in the presence of ascorbic acid and acetic acid-ammonium acetate buffer in nitric acid or nitric acid mixed media. The results show that the maximum absorption wavelength of the complex is at 545nm. When the amount of HCl, HNO3 or HClO4 in the 50ml color developing solution is 0.02 ~ 0.20ml respectively, the absorbance of the colored complex is basically the same. Up to 5mg Ni (Ⅱ), Co (Ⅱ), Mn (Ⅱ), 1mgW (Ⅵ) and Mo (Ⅵ) did not interfere with the determination of Al. Negative interference with Fe (Ⅱ), Cu (Ⅱ) and Cr (Ⅲ) can be compensated by the same amount of color to eliminate the interference. The positive interference of Ti (Ⅳ) can be eliminated by adding Fe (Ⅲ) Up to 0.03 mg and 0.08 mg Ti in Fe (III) at 5 mg and 10 mg had little effect on the results. Complex color fast, absorbance within 3 minutes basically stable. Aluminum content in the range of 2.5 ~ 35μg / 50ml Beer’s law is in line with the colored complex molar