目前测定钒的显色剂虽然较多,但在大量铁基中直接测定钒的显色剂却很少。常用的测钒试剂如:N—苯酰基—N—苯基羟胺—氯仿萃取法,摩尔吸光系数仅为5×10~3左右,铁、锰、钛等元素干扰;2.2′—二羧基二苯胺的摩尔吸光系数虽达1×10~4以 At present, although there are many color-developing agents for the determination of vanadium, there are few color-developing agents that directly measure vanadium in a large amount of iron-based materials. Commonly used measuring vanadium reagents such as: N-benzoyl-N-phenyl hydroxylamine - chloroform extraction, the molar absorption coefficient of only about 5 × 10 ~ 3, iron, manganese, titanium and other elements interfere; Although the molar absorption coefficient of up to 1 × 10 ~ 4 to