摘要
研究了5-Br-PADAP-H_2O_2一阶导数吸光光度法测定钒的适宜条件和有关参数.显色反应的适宜pH值为0.5～2.0,求导的参数是狭缝宽度2nm,微分宽度△λ=10nm,扫描速度为120nm/min,扫描范围550～650nm,确定一阶导数光谱在583nm处有一波峰,在615nm有一波谷,利用峰-峰法测定钒.本法不仅有高的灵敏度,而且有很强的抗干扰能力,选择性更高.用于钢铁和铝合金中微量钒的测定,得到满意的结果.
The suitable conditions and relative parameters of the first-order derivative spectrophototnetric determination of vanadium with 5-Br-PADAP and H2O2 has been studied. The optimum pH range is between 0.5 and 2.0 for the colour reaction'. The parameters of derivation are slit width = 2nm, differential width A = 10nm( scanning speed 120 nm/min,arid scanning range 550-650 rim. The first-order derivative spectrum shows a positive peak at 583 nm and a negative peak at 615 nm. The measurement was made by the 'peak-peak method'. It is not only sensitive and has strong anti-iriterfere abiltity and so this method has highler selectivity than normal spectrophotometry, This method is satisfactory for applying to determination of microamounts of vanadium in iron, steel and aluminium alloy.
出处
《西南师范大学学报（自然科学版）》
CAS
CSCD
1992年第2期188-193,共6页
Journal of Southwest China Normal University(Natural Science Edition)
关键词
钢铁
铝合金
比色法
钒
测定
vanadium determination
first-order derivative spectrophotom- etry
5-Br-PADAP-H2O2 system
