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研究了在硫酸介质中用5-Br-PADAP分光光度法测定Cr(Ⅵ)。络合物的最大吸收在590nm,摩尔吸光系数为2.0×10~4,有色物质的组成为Cr_3O_1~(2-):5-Br-PADAP=1:2。1～25μg/25ml符合比耳定律。可用于铬铝钢、水、矿物中铬或Cr(NO_3)_3中Cr(Ⅵ)的测定。是一个测定铬的好方法。
The determination of Cr (Ⅵ) by 5-Br-PADAP spectrophotometry in sulfuric acid medium was studied. The maximum absorption of the complex at 590nm, the molar absorption coefficient of 2.0 × 10 ~ 4, the composition of the colored material Cr_3O_1 ~ (2 -): 5-Br-PADAP = 1: 2.1 ~ 25μg / 25ml Beer’s Law . It can be used for the determination of Cr (Ⅵ) in chromium or Cr (NO_3) _3 in chrome-aluminum steel, water and minerals. Is a good way to determine chromium.