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在过氧化氢存在下,吡啶偶氮间苯二酚和钒的反应条件及其在钢、铁矿石、合金和四氯化钛中微量钒的测定已有所报导。本工作着重对显色条件、大量钛干扰的消除以及其它共存离子的影响进行了试验。酸度以0.72N为宜。酸度在0.36N—1.08N范围内吸光度变化不大,低于0.36N时显色液变混,高于1.08N时,显色速度变慢且吸光度降低。加热可加速显色。络合物在2小时内稳定。10毫升10％氟化铵可完全消除50
The reaction conditions of pyridinium azoles resorcinol and vanadium and the determination of trace vanadium in steel, iron ore, alloy and titanium tetrachloride in the presence of hydrogen peroxide have been reported. This work focuses on the color conditions, the elimination of a large number of titanium interference and other effects of coexisting ions were tested. Acidity to 0.72N appropriate. Acidity in the range of 0.36N-1.08N little change in absorbance, less than 0.36N when the color liquid become mixed, higher than 1.08N, the color development speed and absorbance decreased. Heating accelerates color development. The complex is stable within 2 hours. 10 ml 10% ammonium fluoride can completely eliminate 50