Abstract
Three-dimensional excitation-emission matrix (EEM) fluorescence with thermal quenching has been applied to raw and size-fractionated freshwaters. To size- fractionate organic matter, sequential filtration through mixed-ester-cellulose membrane filters with nominal pore size of 1.2, 0.1 and 0.025 mu m were used. Humic-like fluorophores (peaks A and C) have been found to dominate EEMs of raw and all size fractions of studied waters. Peak A fluorescence intensity has been found to be more thermally sensitive than peak C fluorescence intensity. Humic-like fluorescence intensity was generally size independent, which indicated that it was present mainly in the smallest size fraction (
| Original language | English |
|---|---|
| Pages (from-to) | 3069-3076 |
| Number of pages | 8 |
| Journal | Water Research |
| Volume | 41 |
| DOIs | |
| Publication status | Published - 1 Jan 2007 |
Keywords
- size fractionation
- fluorescence
- aquatic colloids
- thermal quenching
- organic matter