Chakrabarti A K
Department of Inorganic and Analytical Chemistry, Jadavpur University, Calcutta 700 032, India.
Talanta. 1995 Sep;42(9):1279-83. doi: 10.1016/0039-9140(95)01574-u.
A sensitive and selective photometric method for the trace determination of vanadium with cinnamohydroxamic acid extracted from 1.8 M HCl in methyl isobutyl ketone is described. The wine-red chelate formed under an optimum acidity of 1.3-2.6 M HCl absorbs with a maximum at 525 nm. Beer's law is obeyed in the range 0-8 ppm of vanadium(V) and the optimum range of determination of vanadium is found to be 1-8 ppm. The molar absorptivity and Sandell's sensitivity are 6.0 x 10(3) l mol(-1) cm(-1) and 0.0086 mug cm(-2) of vanadium(V) at 525 nm. The photometric determination of trace amounts of vanadium in materials such as alloys, minerals and rock ores is also reported. The solvent extraction methods are simple, rapid and highly selective with fluoride used as a masking agent for Fe and Ti. The standard deviations are minimal and the mean error is only 0.015%.
本文描述了一种灵敏且选择性好的光度法，用于痕量钒的测定。该方法是在1.8 M盐酸介质中，用肉桂异羟肟酸从甲基异丁基酮中萃取钒，在1.3 - 2.6 M盐酸的最佳酸度下形成酒红色螯合物，其在525 nm处有最大吸收。在0 - 8 ppm五价钒范围内符合比尔定律，钒的最佳测定范围为1 - 8 ppm。在525 nm处，五价钒的摩尔吸光系数和桑德尔灵敏度分别为6.0×10³ l·mol⁻¹·cm⁻¹和0.0086 μg·cm⁻²。还报道了该方法用于合金、矿物和岩石等材料中痕量钒的光度测定。该溶剂萃取方法简单、快速且选择性高，使用氟化物作为铁和钛的掩蔽剂。标准偏差极小，平均误差仅为0.015%。
