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Determination of the molecular weight of fulvic acids by UV/VIS spectroscopy
Örebro University, Department of Natural Sciences.ORCID iD: 0000-0002-2674-4994
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1999 (English)In: Chemosphere, ISSN 0045-6535, E-ISSN 1879-1298, Vol. 38, no 4, p. 783-794Article in journal (Refereed) Published
Abstract [en]

Partial least squares (PLS) modeling was applied to investigate number-average molecular weights (Mn) and weight-average molecular weights (Mw) of fulvic acids (FAs) in relation to the corresponding UVNIS spectra. The Mn and Mw values were determined by size exclusion chromatography (SEC). The impact of pH control, wavelength range and density as well as smoothing and derivation of spectra were tested. It was found that PLS models based on absorbance spectra can be a fast and powerful complement to existing techniques employed for determination of molecular weights of FAs. Control of pH of the FA solutions is important for the performance of the models. The models were also compared with the best univariate alternatives.

Place, publisher, year, edition, pages
1999. Vol. 38, no 4, p. 783-794
National Category
Chemical Sciences
Research subject
Chemistry; Enviromental Science
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URN: urn:nbn:se:oru:diva-5187DOI: 10.1016/S0045-6535(98)00215-XOAI: oai:DiVA.org:oru-5187DiVA, id: diva2:158125
Available from: 2009-01-30 Created: 2009-01-30 Last updated: 2017-12-14Bibliographically approved

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Bäckström, MattiasAllard, Bert

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