Determination of the molecular weight of fulvic acids by UV/VIS spectroscopy

被引：8

作者：

Dahlén, J ^{[1
]}

Bäckström, M ^{[1
]}

Ephraim, J ^{[1
]}

Borén, H ^{[1
]}

Allard, B ^{[1
]}

机构：

[1] Linkoping Univ, Dept Water & Environm Studies, SE-58183 Linkoping, Sweden

来源：

CHEMOSPHERE | 1999年 / 38卷 / 04期

关键词：

D O I：

10.1016/S0045-6535(98)00215-X

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Partial least squares (PLS) modeling was applied to investigate number-average molecular weights (M-n) and weight-average molecular weights (M-w) of fulvic acids (FAs) in relation to the corresponding UV/VIS spectra. The M-n and M-w 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. (C) 1998 Elsevier Science Ltd. All rights reserved.

引用

页码：783 / 794

页数：12

共 15 条

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