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在草酸根离子存在下 ,用汞灯照射铁 盐溶液 ,通过光化学反应产生的铁 与试液中的钒 作用 ,终点用双指示电极安培滴定法检测。铬 的干扰用与硫酸钡共沉淀予以消除。
In the presence of oxalate ions, the iron salt solution is irradiated with a mercury lamp, the iron produced by the photochemical reaction is reacted with vanadium in the test solution, and the end point is detected by double-indicator electrode amperometric titration. Chromium interference with coprecipitation with barium sulfate to be eliminated.