鋼铁中铌的比色測定方法,常用的显色剂有硫氰酸盐,对位苯二酚,焦性沒食子酸等,多数的方法須經过分离手續。利用铌磷钼兰比色法測定灵敏度較高。研究了酸度,氯化亚錫、磷酸鈉的量对于钼兰显色的影响。向江胁等也研究了各种試剂量的影响,同时試驗了时間对于铌磷钼离子的形成与磷钼离子于酸度增大后分解的关系。等认为在試样溶液中加入钼酸銨后,在30℃維持15分钟,使铌磷钼离子形成完全,向江胁等的研究中沒有提到溫度,但也认为15分钟为适当。铌磷钼离子形成后,加入硫酸增高酸度,使磷钼离子 Colorimetric determination of niobium in steel, commonly used reagent thiocyanate, hydroquinone, pyrogallol and so on, the majority of the method to be separated procedures. The use of niobium phosphorous molybdenum blue colorimetric determination of high sensitivity. The effects of acidity, stannous chloride and sodium phosphate on the color development of Molasses were studied. We also studied the effect of various reagents on Jiang et al. We also tested the relationship between the time and the formation of niobium phosphomolybdate ions and the decomposition of phosphorus and molybdenum ions after the acidity increased. And the like, it is considered that addition of ammonium molybdate to the sample solution was carried out at 30 ° C for 15 minutes to complete the formation of niobium phosphomolybdate ions. However, temperature was not mentioned in studies such as the jiangxue et al., But 15 minutes was also considered appropriate. After the formation of niobium phosphorous and molybdenum ions, sulfuric acid is added to increase the acidity and make the phosphorous and molybdenum ions