An environmental friendly Bi-brass with cutting-free and excellent properties was developed to substitute for Pb-brass.

研制了一种性能优异的易切削铋黄铜来替代有毒的铅黄铜。

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It is simple and quick to determine trace Pb and Bi in pure copper using the graphite furnace atomic absorption spectrophotometry.

石墨炉原子吸收光谱法测定纯铜中痕量铅和铋，方法可靠，简单快速。

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The impurity elements as Cd, Zn, Tl, Pb, Bi were removed from the crude indium by the vacuum process instead of the traditional way using reagent.

利用金属饱和蒸汽压的不同，采取在一定真空度下使铟熔化脱除粗铟中的镉，达到粗铟提纯的目的，同时考察了粗铟中其他杂质元素的变化。

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