差示光度法测定铝合金中高含量的铬李民菁（中国长城铝业公司研究所，郑州，４５００４１）二苯氨基脲光度法常用于低含量铬的测定。本文以二苯氨基脲为显色剂，用差示光度法测定５４５４铝合金中高含量的铬。试样以氢氧化钠分解，用过氧化氢将铬氧化成六价，在０．０５ｍ... Determination of Chromium in Aluminum Alloy by Differential Spectrophotometry Li Minjing (Research Institute of Great Wall Aluminum Company, Zhengzhou 450041, China) Diphenylamino semicarbazone photometry is commonly used for the determination of low chromium content. In this paper, diphenyl semicarbazide as a chromogenic reagent, the determination of high content of chromium in 5454 aluminum alloy by differential spectrophotometry. The sample is decomposed with sodium hydroxide, hydrogen peroxide is oxidized to hexavalent hexahydrate, 0.05m ...