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钢中铝的测定,一般多使用三苯甲烷类染料,如铝试剂、铬甘青R、铬天青S等作为显色剂。作者曾指出用铬天青S直接法测定钢中铝时,Fe~卄的存在不但无害,而且还可以减弱钒钛等离子的干扰,这可能是由于与铝争夺试剂的结果,故铬天青S的用量需要控制。量过小使吸光度降低,工作曲线的直线部分也下降,量过大则削弱了Fe~卄对干扰离子的掩蔽作用。然而市售铬天青S牌号很多、质量不一,使得对CAS的有效成份的控制有困难,而且试
Determination of aluminum in steel, the general use of triphenylmethane dyes, such as aluminum reagents, chromium cyanine R, chrome azure S as a developer. The authors have pointed out that the determination of aluminum in steel by chromazurol S direct method, the presence of Fe ~ 不 not only harmless, but also can reduce the interference of vanadium and titanium plasma, which may be due to the results of the reagents and aluminum competition, so chrome azure The amount of S needs to be controlled. The amount of light is too small to reduce the absorbance, the straight line part of the working curve also decreased, the amount is too large, weakened Fe ~ 卄 masking effect of interfering ions. However, there are many grades of chromazurol S available on the market which are of different quality, which makes it difficult to control the active ingredients of CAS,