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青铜除含主要成份铜和锡外,根据对其性能的不同要求,还可能含有少量铁、铝、锰、镍、锌、铅、锑、砷、磷、硅等元素。青铜中铁含量的测定,可以用以邻菲啰啉为显色剂的经典分光光度法。但是当试样中铁的含量比铜的含量少得太多(如小于1:90)时,在Fe~(2+)离子与邻菲啰啉形成的配合物的最大吸收峰处(511nm),铜的干扰不可忽略,误差将大于5.9%(见图1)。故一般需要用萃取等预分离手段把主体铜分离去之后再进行铁的测
In addition to the main copper and tin bronze, bronze may contain a small amount of iron, aluminum, manganese, nickel, zinc, lead, antimony, arsenic, phosphorus and silicon depending on its performance requirements. Determination of iron content in bronze, phenanthroline can be used as a reagent for the classic spectrophotometry. However, when the content of iron in the sample is less than that of copper (for example, less than 1:90), at the maximum absorption peak (511 nm) of the complex formed between Fe 2+ ions and phenanthroline, Copper interference can not be ignored, the error will be greater than 5.9% (see Figure 1). It is generally required to use pre-separation means such as extraction to separate the main copper after the iron test