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研究了钼 -铜 -硫脲 -硫氰酸盐 -罗丹明 B-聚乙烯醇高灵敏显色体系测定痕量钼的条件。缔合物最大吸收峰在 5 80 nm,表观摩尔吸收系数 ε=1 .6 6× 1 0 6L· mol- 1 · cm- 1 ,钼浓度在 0 .1 0 - 0 .5 0 μg/ 2 5 m L范围内符合比耳定律。并进一步讨论了显色反应的机理 ,认为显色体系中的物质是一种以 {[( Cux Moy Oz) p-·i A+· j SCN- ]k-·k RB+}的结构形式存在的大截面吸光粒子。
The condition of molybdenum-copper-thiourea-thiocyanate-rhodamine B-polyvinyl alcohol high sensitivity colorimetric system for the determination of trace molybdenum was studied. The maximum absorption peak of the complex was at 5 80 nm with an apparent molar absorption coefficient of ε = 1.6 × 10 6 L · mol -1 · cm -1 and a molybdenum concentration of 0.100-0.500 μg / 2 Beer law is within 5 m L. The mechanism of the chromogenic reaction is further discussed. It is considered that the substance in the chromogenic system is a kind of structure with the structure of {[(Cux Moy Oz) p- · i A + · j SCN-] k- · k RB +} Cross-section of light-absorbing particles.