کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1163689 1490979 2015 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Combining linear polarization spectroscopy and the Representative Layer Theory to measure the Beer–Lambert law absorbance of highly scattering materials
ترجمه فارسی عنوان
ترکیبی از طیف سنجی قطبش خطی و تئوری لایه نماینده برای اندازه گیری قانون جذب قانون لرهبرت مواد بسیار پراکنده
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
چکیده انگلیسی


• A new optical setup based on linear polarization light spectroscopy.
• Reducing multiscattering effect on diffuse reflectance signal.
• Using the Representative Layer Theory to retrieve an Absorbance fulfilling Beer–Lambert law.
• Experimental evaluation on highly scattering samples in liquid and powdered form.

Visible and Near Infrared (Vis–NIR) Spectroscopy is a powerful non destructive analytical method used to analyze major compounds in bulk materials and products and requiring no sample preparation. It is widely used in routine analysis and also in-line in industries, in-vivo with biomedical applications or in-field for agricultural and environmental applications. However, highly scattering samples subvert Beer–Lambert law's linear relationship between spectral absorbance and the concentrations. Instead of spectral pre-processing, which is commonly used by Vis–NIR spectroscopists to mitigate the scattering effect, we put forward an optical method, based on Polarized Light Spectroscopy to improve the absorbance signal measurement on highly scattering samples. This method selects part of the signal which is less impacted by scattering. The resulted signal is combined in the Absorption/Remission function defined in Dahm's Representative Layer Theory to compute an absorbance signal fulfilling Beer–Lambert's law, i.e. being linearly related to concentration of the chemicals composing the sample. The underpinning theories have been experimentally evaluated on scattering samples in liquid form and in powdered form. The method produced more accurate spectra and the Pearson's coefficient assessing the linearity between the absorbance spectra and the concentration of the added dye improved from 0.94 to 0.99 for liquid samples and 0.84–0.97 for powdered samples.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Analytica Chimica Acta - Volume 853, 1 January 2015, Pages 486–494
نویسندگان
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