硅锑钼杂多酸·罗丹明B缔合物的共振散射光谱研究及其应用

Study of the Associated Complex of Si-Sb-Mo Heteropoly Acid-Rhodamine B with Resonance Scattering Spectrometry

中文关键词:  硅  杂多酸  罗丹明B  共振散射光谱分析

英文关键词:Si  heteropoly acid  rhodamine B  resonance scattering spectrometry

中文摘要:

      在0.04mol/LH₂SO₄介质中,SiO₃^2-、Sb(Ⅲ)和MoO₄^2-形成SiSbMo三元杂多酸;调节酸度至0.22mol/LH₂SO₄,加入罗丹明B生成(SiSbMo杂多酸)·(罗丹明B)四元缔合物,该缔合物在600nm处产生一灵敏的共振散射峰.据此建立了一个测定2～40ng/mLSi的共振散射光谱分析新方法,用于钢样中硅的测定,结果满意.

英文摘要:

      A new resonance scattering spectroscopic method for the determination of 2～40 ng/mL Si has been described. It is based on SiO₃^2-, Sb(Ⅲ) and MoO₄^2- forming the ternary heteropoly acid of Si Sb Mo in the medium of 0.04 mol/LH₂SO₄. After the concentration ofH₂SO₄ was adjusted to 0.22 mol/L, Rhodamine B was added. The associated complex of Si Sb Mo heteropoly acid rhodamine B was formed. It has a sensitive resonance scattering peak at 600 nm. The method has been applied to determination of Si in steel samples, with satisfactory results. The resonance scattering mechanism of the ternary associated complex has been investigated. The results show that the main reasion exhibiting the resonance scattering light is owing to the formation of unsoluble associated complex and colloid in big size.