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试样中微量锰含量的测定常用KMnO4比色法,已知M(Mn) = 55.00 g·mol–1。称取含锰合金0.5000 g。经溶解、KIO3氧化为MnO4–后,稀释至500.0 mL。在525 nm下测得吸光度为0.400;另取锰含量相近的浓度为1.0×10-4 mol·L–1的KMnO4溶液,在同样条件下测得吸光度为0.585,已知它们的测量复合光吸收定律,因此,合金中锰的百分含量为( )。
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