分光光度法测定碘酸钾碘盐中的碘

Using Spectro-photometry to Measure Iodidum in Kali-iodidum

根据碘酸钾、碘化钾在酸性介质中与结晶紫形成稳定的离子缔合物,用四氯化碳萃取后,以分光光度法测定出食盐中碘酸钾的含量,再换算出碘的含量。实验表明:碘酸钾在0～10μg.ml-1范围内呈良好的线性关系,回归方程为A=0.08210C+0.0046,r=0.9999(n=5),ε=1.77×104L.mol-1.cm-1。本法与食品卫生标准检验方法测得的结果基本一致,方法简便、灵敏、准确,可用于食盐中碘的测定。

in acidity medium potassium iodate amt kali-iodidum together with the crystal purple form stable hydronium substance, using chloridized carbon to extract, then using the speetro photometry to measure kali-iodidum contained in salt, later converting the content of iodidum . The experiment shows that kali-iodidum keeps good linearity relationship in the scope of 0-10μg·ml^ -1 ,and the regressing equation is A=0.08210C＋0.0046,r=0.9999 （n=5）,ε=l.77 ×10^4L·mol^-1·cm^-1.The method is similar to the result of food standard , which is easy ,precise and correct and can be used to measure iodidum in salt.