论文部分内容阅读
利用钒在4,4＇—二（二甲胺基）二苯胺溶液（简称BGL）和溴酸钾的氧化反应中的催化作用,用分光光度法确立了定量测定超微量钒到8P g/r_il的方法。 在弱酸性溶液中,当V（IV）,（V）存在时,由于BGL和溴酸钾的接触,被溴酸钾氧化,生成在725nm处保持有最大吸收的Bindschedl’Sgyeen（简称BG）。BG的发色速度和钒的浓度有关,用定时法,在反应开始后的一定时间内,生成物BG的吸光度（波长在725nm）和钒的浓度成一定比例关系。若测定条件是:BGL浓度7.8 ×10~（-4）
The method for the quantitative determination of ultra-trace vanadium to 8P g / r_il was established spectrophotometrically using the catalytic action of vanadium in the oxidation of 4,4’-bis (dimethylamino) diphenylamine solution (abbreviated as BGL) and potassium bromate . In weak acid solution, when V (IV), (V) is present, due to the contact of BGL with potassium bromate, it is oxidized by potassium bromate to generate Bindschedl’Sgyeen (BG) which maintains the maximum absorption at 725nm. The color development rate of BG is related to the concentration of vanadium. With the timing method, the absorbance (wavelength at 725 nm) of product BG is proportional to the concentration of vanadium within a certain period of time after the reaction starts. If the determination conditions are: BGL concentration of 7.8 × 10 ~ (-4)