校正峰电位漂移偏最小二乘极谱催化波同时测定轻稀土

Simultaneous Determination of Light Rare Earth with the Drift of Peak Potential Corrected by Partial Least Squares in Polarography

应用Ｍ２７３．Ａ电化学系统中的线性扫描技术，确定了８．０×１０－５ｍｏｌ／Ｌ二甲酚橙及ｐＨ４．０ＨＡｃ－ＮａＡｃ缓冲体系为偏最小二乘极谱法同时测定Ｌａ、Ｃｅ、Ｐｒ、Ｎｄ、Ｓｍ、Ｅｕ的最佳极谱体系。６种稀土元素的线性范围均在１．０× １０－７～１．２ × １０－５ｍｏｌ／Ｌ。并对极谱峰电位随浓度漂移进行了校正，提高了方法的准确度。

Some conditions for the simultaneous determination of La, Ce, Pr, Nd, Sm and Eu were studied with linear sweep voltammetry using M273A electrochemical system and partial least squares. The experimental results showed that the optimum electrolyte for the simultaneous determination of La, Ce, Pr, Nd, Sm and Eu was 8.0 x 10(-5) mol/L xylenol orange and pH = 4.0 HAc-NaAc buffer solution. All the linear ranges of these elements were 1.0 x 10(-7) mol/L to 1.2 x 10(-5) mol/L. The accuracy was improved a lot when the drift of peak potential was corrected with the concentration.