FeCl_3 - K_2 Cr_2O_7 volumetric analysis is used for the determination of metal Ferrum in vanadium residue, which abstains from the use of mercury, simplifies device, improves the speed of analysis.

• 采用三氯化铁一重铬酸钾容量法测定钒渣中的金属铁的含量,消除了汞害,简化了装置,提高了分析速度,适于工业分析。