Application of wavelet transform to background correction in inductively coupled plasma atomic emission spectrometry
Application of wavelet transform to background correction in inductively coupled plasma atomic emission spectrometry
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DOI：
10.1016/s0003-2670(03)00395-7
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发表时间：
2003-06-06
影响因子：
6.2
通讯作者：
Zhang, ZX
中科院分区：
文献类型：
--
作者：
Ma, XG;Zhang, ZX
提出了一种基于小波变换的背景校正方法，并将其应用于电感耦合等离子体原子发射光谱法（ICP-AES）。该方法根据背景信号与待测物信号的不同频率进行分离。与分析物信号相比，背景具有低频率。通过去除归因于信号的分量，可以通过小波重构来拟合分析物线的光谱窗口上的背景。结果表明，小波变换技术可以处理各种背景和低信噪比的光谱，且不需要样品组成的先验知识，不需要选择合适的背景校正点，也不需要对背景分布进行数学假设。该技术对线性背景的校正效果与传统的三点背景校正方法相当，对曲面背景的校正效果优于传统的三点背景校正方法。通过对真实的光谱数据的处理，表明该方法是一种有效的、实用的背景校正方法。(C)2003 Elsevier Science B. V.保留所有权利。
A background correction method based on wavelet transform was devised and applied to inductively coupled plasma atomic emission spectrometry (ICP-AES). The proposed approach separated background from analyte signal according to their different frequencies. Compared with the analyte signal, the background has a low frequency. By removal of the components attributed to the signal, the background over the spectral window of the analyte line can be fitted through wavelet reconstruction. The results showed that the wavelet transform technique could handle all kinds of background and low signal-to-background ratio spectra, and required no prior knowledge about the sample composition, no selection of suitable background correction points, and no mathematical assumption of the background distribution. This technique performed as well as the conventional three-point background correction method for linear backgrounds, and provided better results than the latter for curved backgrounds. The proposed procedure was illustrated, by processing real spectra, to be an effective and practical tool for background correction in ICP-AES. (C) 2003 Elsevier Science B.V. All rights reserved.