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通过对扫描式电感耦合等离子体原子发射光谱仪(ICP-AES)出射光谱线峰位移(Δλ)的机理研究,发现温度的变化、波长的变化以及光谱仪机械的系统误差是产生谱线峰位移的主要因素,首次测量了谱线峰位移与波长变化之间的非线性函数关系曲线Δλ-λ,以及谱线峰位移与温度变化之间的非线性函数关系曲线Δλ-T,并用多项式方程表达了这些函数关系.本研究还发现,不同的光栅单色仪有近似相同的Δλ-λ函数关系曲线,但是Δλ-T的函数关系曲线却很不相同.利用这些非线性函数方程式,设计开发了扫描式ICP-AES光谱仪的智能波长校正装置(IWC),用它取代传统的局部恒温系统及谱线描述法进行样品分析的结果表明,智能波长校正的ICP光谱仪(ICP—IWC)谱线峰定位精度高,具有省时、安全、结构简单的特点,有广阔的应用前景.
The mechanism of the peak shift (Δλ) of the emission spectral line by ICP-AES shows that the change of temperature, the change of wavelength and the systematic error of the spectrometer are the peak shifts For the first time, the nonlinear function curve Δλ-λ between the spectral peak displacement and the wavelength change and the non-linear function curve Δλ-T between the spectral peak displacement and the temperature change were measured and expressed by the polynomial equation These functions also show that different grating monochromators have the same Δλ-λ curve, but Δλ-T has a very different function curve. Using these nonlinear function equations, The ICP-AES spectrometer’s Intelligent Wavelength Correction (IWC) device, which replaces the traditional localized thermostat system and spectral descriptive method for sample analysis, shows that peak position accuracy of the ICP-ICP spectrometer (ICP-IWC) High, with the time-saving, safe, simple structure, has broad application prospects.