合金钢中微量钒的测定有亚铁滴定容量法,过氧化氢比色法;二苯胺、联苯胺之类氧化还原指示剂显色的比色法。这些方法的再现性差或灵敏度低。文献中指出,当过氧化氢存在时 PAR 可显色钒,允许较高的酸度,在 pH 0.75～4,PAR:V:H_2O_2=1:1:1,克分子吸光系数14000,0～3微克/毫升服从比尔定律,发色液可稳定两天。大量酒石酸、柠檬 Determination of trace vanadium alloy steel with ferrous titration volumetric method, hydrogen peroxide colorimetric method; diphenylamine, benzidine and the like redox indicator colorimetric method. These methods have poor reproducibility or low sensitivity. The literature states that PAR can develop color when hydrogen peroxide is present, allowing higher acidity at pH 0.75-4, PAR: V: H 2 O 2 = 1: 1: 1, molecular extinction coefficient 14000 and 0-3 μg / Ml obey Bill’s law, hair color solution can be stable for two days. A lot of tartaric acid, lemon