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钒与二苯氨基脲反应生成黄褐色的产物对二苯氨基脲比色法测定铬发生干扰。据报导,在钒与铬之比不大于10∶1时.可在显色后放置10～15分钟,待钒的络合物的色泽褪去后再测定铬的络合物的吸光度。但是,钒钛磁铁矿中钒与铬之比往往远大于10∶1(标样BH0101 V:Cr(?)31,BH0102 V:Cr(?)7,BH0103V:Cr(?)10)。即使钒与铬之比在10∶1之内,在钒的络合物的色泽消褪的同时铬与二苯氨基脲生成的络合物的色泽也有减弱的现象.也有资料介绍用8-羟基喹啉-氯仿萃取分离钒,但其手续繁杂。我们在实践中发现于PH=6.0～8.5分离铁等干扰元素时钒也被定量除去,从而较好地解决了这个问题.
The reaction of vanadium with diphenylsemicarbazide produces a tan product that interferes with the determination of chromium by the diphenylcarbazide colorimetric method. It has been reported that when the ratio of vanadium to chromium is not more than 10: 1, it may be allowed to stand for 10 to 15 minutes after color development, and the absorbance of the chromium complex is determined after the color of the complex of vanadium fade. However, the ratio of vanadium to chromium in vanadium titanomagnetites is often much larger than 10: 1 (BH0101 V: Cr (?) 31, BH0102 V: Cr (?) 7, BH0103V: Cr (?) 10). Even if the ratio of vanadium to chromium is within 10: 1, the color of the complex formed between chromium and diphenylsemicarbazide diminishes as the color of the vanadium complex fade away.However, Quinoline - chloroform extraction of vanadium, but its complicated procedures. In practice, we found that vanadium is also quantitatively removed when the interference elements such as iron are separated from each other at a pH of 6.0-8.5, which solves this problem.