同时多组分分析动力学比均定中变换计算法的原理及其应用于光度法测定面包和水样中碘酸根和溴酸根

Principle of Simultaneous Multicomponent Analysis by the Algorithm of Mean Centering Transform of Ratio Kinetic Profiles and Its Application to Photometric Determination of Iodate and Bromate in Bread and Water Samples

摘要: 应用动力学方法,在不经分离的条件下,采用比均定中变换,同时测定面包与水样中溴酸根与碘酸根的含量.溴酸根、碘酸根的质量浓度在0.1~3.5 mg·L-1范围呈线性,比均定中值MC(D)与浓度C的线性回归方程的相关系数均在0.990 0以上,检出限分别为0.01 mg·L-1与0.02 mg·L-1,相对标准偏差分别为2.84%与1.96%,其回收率在82.2%~100.2%之间.

Abstract: A brief introduction of the principle of mean centering of ratio kinetic profiles was given and its application to the simultaneous determination of iodate and bromate in water and bread was proposed.Linear relationships between values of MC(D) and concentrations of either IO-3 or BrO-3 were obtained in ranges from 0.1-3.5 mg·L-1 in accordance to their linear regression equations having correlation coefficients over 0.990 0,with detection limits of 0.02 mg·L-1 and 0.01 mg·L-1 for IO-3 and BrO-3 respectively.Precision of the method was tested at the concentration level of 0.5 mg·L-1 for 10 determinations,giving values of RSD 1.96% for IO-3 and 2.84% for BrO-3.Recovery was tested by standard addition method,and values of recovery obtained were in the range of 82.2% to 100.2%.