高分子材料中金属镉含量的测定

Determination of the content of the metal cadmium in the high polymer material

在聚乙烯醇存在下的酸性介质中,镉(Ⅱ)分别与碘化钾、罗丹明B形成水溶性的三元离子缔合物,据此提出了测定镉的高灵敏度的分光光度法。最大吸收波长在610nm处。相关系数γ=0.9990。用此方法测定了高分子材料(PP、PS、ABS)中的金属镉的含量。

In acid medium with polyvinyl alcohol in existence, cadmium （ Ⅱ ） can form water-soluble ternary ionic association with potassium iodide and Rhodamine B respectively. According to this the paper proposes the high sensitivity spectrophotometry to determine cadmium. The maximum absorption wavelength locates in 610nm. Correlation coefficient γ=0. 9990. The content of the metal cadmium in the high polymer material （PP, PS, ABS） is determined with this method.