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本文应用回归正交设计,与分光光度法结合,测定多个波长下的吸光度,得到吸光度与待测组分的浓度之间的回归方程组。将同样条件下测得的各波长下试样的吸光度值代入回归方程组求解,即可求得各待测组分在试样中的含量。应用这种方法,测定了五个稀土铝合金标准样中的镧、铈、钋和钕等四个主要稀土组分的含量,结果表明本方法是有效而可靠的。其相对标准偏差不超过8.6％。从而实现了用光度法在铝合金中同时测定四种主要稀土组分的目的。
In this paper, regression orthogonal design, combined with spectrophotometry, absorbance measured at multiple wavelengths, absorbance and concentration of the components to be measured between the regression equations. Will be measured under the same conditions absorbance values of each sample were substituted into the regression equation solution, you can get the content of each component to be tested in the sample. Using this method, the contents of four major rare earth elements, lanthanum, cerium, gallium and neodymium in five rare earth aluminum alloy standards, were determined. The results show that the method is effective and reliable. The relative standard deviation does not exceed 8.6%. The purpose of simultaneous determination of the four main rare earth components in the aluminum alloy by the photometric method is thus achieved.