摘要
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。
Mo（Ⅵ） was catalyzed and reduced to Mo（Ⅴ） by Fe（Ⅲ） in sulfuric acid solution with ascorbic acid-sulfocarbamide as reducing agent,and the[MoO（SCN）_5]^（2-） complex anion was formed in an excess of thiocyanate,and the alkaline cationic dye acridine red-[MoO（SCN）_5]^（2-） ion-association complex was produced in the presence of Arabic gum and alkaline cationic dye acridine red.This ion-association complex has the maximum absorbance wavelength at 553nm,and its apparent molar absorptivity is 2.7×10~5L · mol^（-1）·cm^（-1）.Beer＇ s law was obeyed in the range of 0.0017—80μg · mL^（-1） for the mass concentration of Mo（Ⅴ）.The effects of interfering ions were eliminated by the mixed masking agent of tartaric acid-oxalic acid-citric acid.Trace Mo（Ⅵ） in nickelmolybdenum ore can be directly determined in aqueous phase by the method.
出处
《光谱实验室》
CAS
CSCD
2012年第1期439-442,共4页
Chinese Journal of Spectroscopy Laboratory
关键词
分光光度法
钼(Ⅵ)
吖啶红
硫氰酸盐
Spectrophotometry
Molybdenum（Ⅵ）
Acridine Red
Thiocyanate
