关于光谱分析中定标曲线斜度的讨论

为了说明Si2516线的定标曲线的斜度与物质浓度的定量关系是否有更普遍的意义,我们进一步考察了钴、镍的多重谱线系中13条谱线的定标曲线的斜度与物质浓度的关系。一系列的实验结果指出,对某一谱线来说,定标曲线的斜度决定于物质的浓度;在另一方面,当分析物质的浓度在一定范围时,多重谱线中不同谱线的定标曲线的斜度与相应谱线的固有强度也有线性的定量关系。因此我们可以认为在光谱分析中,定标曲线的斜度b主要决定于谱线的强度。对b的物理意义的进一步了解,指出了在实际分析时提高定标曲线斜度的一些途径。

A DISCUSSION ON THE SLOPE OF THE CALIBRATION CURVE IN SPECTROCHEMICAL ANALYSIS

In order to show if the relationshop obtained for Si 2516 between the slope of the calibration curve and its concentration has more general significance we carried out experiments on 13 spectral lines of two nultiplets belonging to the cobalt and nickel spectra. Results show that for a particular spectral line the slope depends on concentration and fur a definite range of the concentration, slope of the curves of spectral lines of the same mnltiplet varies linearly with log of the natural intensity of the corresponding lines. Thus, we may say that in spectrochemical analysis, slope b of the calibration curve essentially depends on the intensity of the spectral line and this in turn depends on the concentration of the constituent and the natural intensity of the line concerned. We believe that an understanding of the physical significance of b is helpful in actual analysis as to find the condition which gives a better slope of the working curve.