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光度法测定锡青铜中微量铝是个困难的课题。这是因为许多牌号锡青铜中铝的含量小于2×10~(-3)％,因此要求测定灵敏度高;同时,使用常用铝显色剂时,所有主成份铜、锡、磷、锌、铅以及杂质铁对测定均有程度不同的干扰。以往的方法主要是Aluminon法、ECR法、CAS-CTMAB法、CAS-OP-10法。这些方法中有的需经多次分离,手续冗长;有的需使用汞或氰化物或大量恶臭的巯基乙酸,不甚理想。
The photometric determination of trace aluminum in tin bronze is a difficult subject. This is because the content of aluminum in many grades of bronze is less than 2 × 10 ~ (-3)%, so the determination sensitivity is high. Meanwhile, when using common aluminum developer, all the main components of copper, tin, phosphorus, zinc and lead As well as impurities of iron to determine the extent of different interference. The previous methods are Aluminon method, ECR method, CAS-CTMAB method and CAS-OP-10 method. Some of these methods need to be separated many times, lengthy procedures; some need to use mercury or cyanide or large amounts of malodorous thioglycolic acid, less than ideal.