介绍了在 ｐＨ1 0～ 2 2的酸性条件下 ,以ＥＤＴＡ—柠檬酸铵—草酸联合掩蔽铁基体 ,采用Ｈ2 Ｏ2 — 5Ｂｒ—ＰＡＤＡＰ—Ｖ三元铬合物光度法测定低合金钢中微量钒的方法 ,该方法简便 ,显色快 ,干扰少 ,检测结果稳定。钢中微量钒的测定多采用钽试剂显色 ,氯仿萃取分离铁的比色 This paper introduced the determination of trace vanadium in low alloy steels by H2 O2 - 5Br-PADAP-V ternary complex spectrophotometry with EDTA-ammonium citrate-oxalate combined with EDTA-ammonium citrate and oxalic acid under acid conditions of pH1 0 ~ 2 2 Method, the method is simple, fast color development, less interference, and the detection result is stable. Determination of trace amounts of vanadium in steel using tantalum reagent color, chloroform extraction colorimetric separation of iron