用二苯卡巴肼作显色剂比色测定微量铬时,它与铬(Ⅵ)作用形成紫红色络合物,反应的灵敏度比较高,选择性也好,已广泛用于钢铁等物质中铬的测定。但此法也存在着一些问题。因此,最近十几年来有人研究了铬(Ⅲ)与有机显色剂的反应,发现不少常见的有机显色剂都能与铬(Ⅲ)直接作用, With diphenylcarbazide as a chromogenic reagent for the determination of trace chromium, it forms a purple complex with chromium (Ⅵ). The reaction has high sensitivity and selectivity and has been widely used in the production of chromium The determination. However, this law also has some problems. Therefore, in recent ten years, some people have studied the reaction of chromium (III) with organic chromogenic reagent and found that many common organic chromogen can directly interact with chromium (III)