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以抗坏血酸-硫脲为还原剂,在稀硫酸中Fe(Ⅲ)催化还原钼(Ⅵ)为钼(Ⅴ),并与硫氰酸盐形成配阴离子,在阿拉伯胶存在下与碱性阳离子染料吖啶红形成离子缔合物。其最大吸收波长为553nm,表观摩尔吸光系数为ε=2.7×10~5L·mol~(-1)·cm~(-1)钼(Ⅴ)质量浓度在0.0017—80μg·mL~(-1)范围内服从比耳定律。适量酒石酸-草酸-柠檬酸水溶液可消除干扰离子的影响。用此方法在水相中直接测定镍钼矿中微量钼。
With ascorbic acid-thiourea as reductant, Fe (Ⅲ) catalyzed reduction of molybdenum (Ⅵ) to molybdenum (Ⅴ) in dilute sulfuric acid and formed anions with thiocyanate, and reacted with basic cationic dyes in the presence of acacia gum Pyridinium forms an ion association. The maximum absorption wavelength was 553 nm, and the apparent molar absorptivity was ε = 2.7 × 10 ~ 5 L · mol -1 · cm -1 .The mol concentration of molybdenum was about 0.0017-80 μg · mL -1 ) Obey Beer’s law within the range. Appropriate amount of tartaric acid - oxalic acid - citric acid solution can eliminate the interference of ions. This method is used for the direct determination of trace molybdenum in nickel molybdenum ore in aqueous phase.