摘要
在１８０～２５０ｍｏｌ／ＬＨ２ＳＯ４介质中，Ｖ（Ⅴ）对酸性铬蓝Ｋ有褪色作用。褪色程度与Ｖ（Ⅴ）量相关，借此建立了吸光光度测定Ｖ的方法。实验表明，褪色反应随温度升高而加快，在沸水浴中１０ｍｉｎΔＡ可达最大值，流水冷却后吸光度保持２４ｈ不变，有色溶液的最大吸收波长为５２０ｎｍ，ε＝１０×１０４Ｌ·ｍｏｌ－１·ｃｍ－１，Ｖ（Ⅴ）量在０～３２ｍｇ／Ｌ内与有色溶液吸光度的减少值呈线性关系。所拟方法用于测定铁矿石中微量Ｖ时，结果与苯甲酰基苯胲比色法一致。
Spectrophotometric determination of vanadium based on de_colourizing reaction from oxidation of acidic chrome blue K by V (Ⅴ) in 1.80～2.50 mol/L H 2SO 4 is reported in this paper. The fading in color is directly proportional to the amount of vanadium. The maximum absorption is at 520 nm and the apparent molar absorptivity is 1.0×10 4 L·mol -1 ·cm -1 . The linear ranges is in 0～3.2 mg/L of V(Ⅴ). The method has been applied to the determination of trace vanadium in iron ores with satisfactory results.
出处
《岩矿测试》
CAS
CSCD
北大核心
1998年第1期79-80,共2页
Rock and Mineral Analysis
关键词
钒
酸性铬蓝K
褪色反应
分光光度法
vanadium, acidic chrome blue K, de_colourizing reaction ,spectrophotometry
