کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1239481 1495690 2015 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Improving precision of X-ray fluorescence analysis of lanthanide mixtures using partial least squares regression
ترجمه فارسی عنوان
بهبود دقت تجزیه و تحلیل فلورسانس اشعه ایکس مخلوط لانتانید با استفاده از رگرسیون حداقل مربعات جزئی
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
چکیده انگلیسی


• 40 complex mixtures of 6 lanthanides were analyzed with EDX and TXRF methods.
• OLS failed in quantitative analysis of individual metals while PLS performed well.
• Accuracy attained with simple EDX method is the same as with expensive TXRF.

This study addresses the problem of simultaneous quantitative analysis of six lanthanides (Ce, Pr, Nd, Sm, Eu, Gd) in mixed solutions by two different X-ray fluorescence techniques: energy-dispersive (EDX) and total reflection (TXRF). Concentration of each lanthanide was varied in the range 10− 6–10− 3 mol/L, low values being around the detection limit of the method. This resulted in XRF spectra with very poor signal to noise ratio and overlapping bands in case of EDX, while only the latter problem was observed for TXRF. It was shown that ordinary least squares approach in numerical calibration fails to provide for reasonable precision in quantification of individual lanthanides. Partial least squares (PLS) regression was able to circumvent spectral inferiorities and yielded adequate calibration models for both techniques with RMSEP (root mean squared error of prediction) values around 10− 5 mol/L. It was demonstrated that comparatively simple and inexpensive EDX method is capable of ensuring the similar precision to more sophisticated TXRF, when the spectra are treated by PLS.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Spectrochimica Acta Part B: Atomic Spectroscopy - Volume 113, 1 November 2015, Pages 126–131
نویسندگان
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