偶氮胂Ⅲ(ASAⅢ)和偶氮氯膦Ⅲ(CPAⅢ),作为稀土元素和铀的显色剂研究得较多。我们发现,钒(V)在抗坏血酸存在下,能与上述试剂生成蓝色络合物,就此对络合物的形成条件及有关参数进行了初步测试。一仪器及试验 72型分光光度计;25型酸度计。钒标准溶液:0.2296g偏钒酸铵,用热水溶解后,于500ml量瓶中稀至刻度,每毫升含钒200μg。取50ml用容量法标定,而后再稀释成每毫升合钒10μg。缓冲溶液:pH4.3,100ml六次甲基四胺(20%)和22ml HCl(1+1)混合。二试验方法取一定量钒于25ml量瓶中,加2ml抗坏血酸(4%)、4ml级冲溶液、2ml偶氮胂Ⅲ(0.04%)或4ml偶氮氯膦Ⅲ(0.04%),稀至刻度。以试剂空白作参比,在波长630nm和610nm处分别测量Ⅴ(Ⅳ)-ASAⅢ Arsenazo Ⅲ (ASA Ⅲ) and chlorophosphonazo Ⅲ (CPA Ⅲ), as rare earth elements and uranium developer more research. We found that vanadium (V) can form a blue complex with the above reagent in the presence of ascorbic acid. Based on this, the formation conditions of the complex and the related parameters were preliminarily tested. An instrument and test 72 spectrophotometer; 25 acidity meter. Vanadium standard solution: 0.2296g ammonium metavanadate dissolved in hot water, dilute to the mark in a 500ml volumetric flask, containing 200μg of vanadium per ml. Take 50ml volumetric method calibration, and then diluted to vanadium per milliliter 10μg. Buffer: pH 4.3, 100 ml Hexamethylenetetramine (20%) and 22 ml HCl (1 + 1) were mixed. Two test methods Take a certain amount of vanadium in 25ml volumetric flask, add 2ml ascorbic acid (4%), 4ml grade red solution, 2ml arsenazo III (0.04%) or 4ml chlorophosphonazo III (0.04%), dilute to scale . Reagent blank as a reference, at the wavelength of 630nm and 610nm were measured Ⅴ (Ⅳ) -ASA Ⅲ