摘要
采用改进催化光度法测定微量钒，即利用微量钒催化溴酸钾氧化甲基紫溶液褪色实现快速测定水中的微量钒。在50mL容量瓶中，在pH为1．6的硫酸加入量0．90mL、0．0100mol／L的溴酸钾溶液加入量4．50mL、2．5×10^-4mol／L的甲基紫溶液加入量5．00mL的条件下，聚乙二醇-200作活化剂时，在92℃恒温反应12min，加钒和不加钒溶液的吸光度之差与钒质量浓度呈线性关系。该法的测定波长为580nm，检出限为5．2×10^-8g／L，最大相对标准偏差为4．3％，回收率为95．8％～104．0％。该法可用于湖水、化工厂排水中微量钒的直接测定。
The improved catalytic spectrophotometric method was used in the determination of trace vanadium. It is a rapid determination method based on trace vanadium catalyzing the oxidation discoloration reaction of potassium bromate with methyl violet. In a 50 mL volumetric flask, when the dosage of sulfuric acid with pH I. 6,potassium bromate solution with concentration 0. 010 mol/L and methyl violet solution with concentration 2.5 ×10^-4 mol/L are 0. 90 ,4. 50 ,5 . 00 mL, respectively, and when the reaction is carried out at 92 ℃ for 12 min using polyethylene glycols200 （ PEG-200 ） as activator, there is a linear relationship between the absorbance difference of vanadium-containing solution to no-vanadium solution and the mass concentration of vanadium. The wavelength for determination is 580 nm. The detection limit of vanadium is 5.2 ×10^-8 g/L. The maximum relative standard deviation is 4.3%. The recovery is 95.8% - 104.0%. This method can be used for determination of trace vanadium in lake water and chemical plant drainage.
出处
《化工环保》
CAS
CSCD
北大核心
2006年第5期436-439,共4页
Environmental Protection of Chemical Industry
关键词
钒
甲基紫
溴酸钾
催化光度法
vanadium
methyl violet
potassium bromate
catalytic spectrophotometry
