Abstract
Fluorescence of organic matter from six contrasting freshwaters was analysed after filtration (1.2 microm and 0.2 microm filter sizes) and pH perturbation (+/-2 pH units from ambient conditions). Two fluorophores were compared in detail: tryptophan-like fluorescence, whose filtration and pH characteristics are relatively poorly understood, and humic-like fluorescence, which is better characterised. Although there was some variability in both fluorophores, the tryptophan-like fluorescence showed the most significant decrease in fluorescence intensity between raw and 1.2 microm filter samples, and a much smaller decrease between 1.2 and 0.2 microm, demonstrating a significant source associated with particulate material as well as a significant
Original language | English |
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Pages (from-to) | 2035-2043 |
Number of pages | 9 |
Journal | Chemosphere |
Volume | 67 |
DOIs | |
Publication status | Published - 1 May 2007 |
Keywords
- humic substances
- fluorescence
- filtration
- organic matter
- pH