电感耦合等离子体原子发射光谱分析中导数光谱法研究 Ⅲ.信背比和检出限  

Numerical Derivative Spectrometry in Inductively Coupled Plasma Atomic Emission Spectrometry Ⅲ.Signal-to-background Ratio and Detection Limit

作　　者：杨金夫[1] 朴哲秀[1] 曾宪津[1] 张卓勇[1] 陈新海[1] 关秋荻 

机构地区：[1]中国科学院长春应用化学研究所,长春130022

出　　处：《分析化学》1992年第2期153-157,共5页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金;中国科学院数理化学局资助

摘　　要：本文比较研究了导数光谱法和常规光谱法的信背比、传统检出限和真实检出限。指出在有光谱干扰的情况下,数值导数技术有类似于提高光谱仪分辨率的作用,既可提高分析线的光谱选择性,又能减小扫描光谱仪的波长定位误差,从而减小光谱干扰对检出限的影响。The present paper deals with the signal-to-background ratio and detection limit of derivative spectrometry. Compared to normal spectrometry, numerical derivative spectrometry can increase signal-to-background ratio by a factor of one to two orders of magnitude, which, however, does not necessarily bring an increase in detection power. Only when an analysis line experiences a serious spectral interference which results in a sharp decrease in signal-to-background ratio in normal spectra, do the numerical derivative techniques severalfold improve the conventional detection limit. If 'true detection limit' is taken as the criterion, the advantage of derivative spectrometry over normal spectrometry is quite significant when spectral interferences occur: similar to the function of a high resolution spectrometer, the derivative techniques can greatly reduce the deteriorating effect of spectral interference on detection power of ICP-AES, due to the increase of selectivity and the decrease of the wavelength positioning errors of a scanning spectrometer.

关 键 词：ICP-AES 光谱干扰 导数光谱法 

分 类 号：O657.31[理学—分析化学]