序言 在硫酸性溶液中二苯胺或联苯胺等被过氧化氢氧化时利用钒的催化作用测定微量钒的方法已经作过报导。看来,用此相同的操作方法,苯胺亦有可能用于钒的测定。用苯胺与用二苯胺和联苯胺的灵敏度相近,但硫酸浓度、加热时间、过氧化氢浓度等影响较二苯胺法小。此外还有较联苯胺法空白低的优点。 用苯胺测定钒时,虽然在硝酸性溶液中利用钒酸氧化苯胺生成蓝绿色染料反应的方法及在8-羟基喹咛存在时,利用钒催化氯酸钾和苯胺反应方法等已有报告,但在灵敏度方面远远不及本法。 Preface In the sulfuric acid solution diphenylamine or benzidine and other oxidized by hydrogen peroxide, the use of vanadium catalyst for the determination of trace vanadium has been reported. It appears that with this same method of aniline is also possible for the determination of vanadium. Aniline and diphenylamine and benzidine with the sensitivity of similar, but the sulfuric acid concentration, heating time, hydrogen peroxide concentration less than the diphenylamine method. In addition, there are advantages compared with benzidine blank. When aniline is used for the determination of vanadium, vanadium oxide is used to oxidize aniline to form a cyan-green dye, and a method of reacting potassium chlorate with aniline using vanadium in the presence of 8-hydroxyquinoline has been reported. However, the sensitivity Far less than the law.