Abstract
This work describes a hybrid procedure for eliminating major interference sources in aqueous near-infrared (NIR) spectra, that include aqueous influence, noise, and systemic variations irrelevant to concentration. The scheme consists of two parts: extension of wavelet prism (WPe) and orthogonal signal correction (OSC). First, WPe is employed to remove variations due to aqueous absorbance and noise; then OSC is applied to remove systemic spectral variations irrelevant to concentration. Although water possesses strong absorption bands that overshadow and overlap the absorption bands of analytes, along with noise and systematic interference, successful calibration models can be generated by employing the method proposed here. We show that the elimination of major interference sources from the aqueous NIR spectra results in a substantial improvement in the precision of prediction, and reduces the required number of PLS components in the model. In addition, the strategy proposed here can be applied to various analytical data for quantitative purposes as well.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (No. 20175024) and the State Tobacco Monopoly Administration Bureau of China (No. 110200101042, 110200201018)
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Chen, D., Hu, B., Shao, X. et al. Removal of major interference sources in aqueous near-infrared spectroscopy techniques. Anal Bioanal Chem 379, 143–148 (2004). https://doi.org/10.1007/s00216-004-2569-2
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DOI: https://doi.org/10.1007/s00216-004-2569-2