二苯基碳酰二肼光度法测定镀锌层中铬

Diphenlycarbazide Spectrophotometry

研究了二苯基碳酰二肼与微量铬的显色反应,在硫酸介质中铬与二苯基碳酰二肼反应生成可溶性的紫红色络合物,在波长为550nm处测其吸光度.当铬含量在0～25μg/50mL范围内符合比尔定律,此法应用于铁片镀锌层中微量铬的测定获得满意结果.

The color reaction of diphenlycarbazide and the microamounts of chromium are studied in the medium of sulfuric acid. A soluble purplish red complex is formed by this reaction, and absorbency of the colorful complex is determined at 550 nm. In the range of 0~25 μg/50 mL for chromium content, the results conform to Beer's law. With this method, satisfactory results can be obtained in the determination of microamount of chromium in galvanized iron.