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• W2068351432 startingPage "2035" @default.
• W2068351432 abstract "Fluorescence of organic matter from six contrasting freshwaters was analysed after filtration (1.2 μm and 0.2 μm 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 μm filter samples, and a much smaller decrease between 1.2 and 0.2 μm, demonstrating a significant source associated with particulate material as well as a significant <0.2 μm fraction. In contrast, humic-like fluorescence shows little change with filtration, suggesting that the majority of this fluorescence is associated with truly dissolved material. The pH perturbation experiments demonstrate that tryptophan-like fluorescence is less impacted by pH than with filter fraction. For humic-like fluorescence, pH effects are weak and are not as consistent as those reported in the literature for extracted humic substances. pH perturbation of the freshwaters shows a wide range of sample specific pH responses, significantly more variable than that observed in experiments using extracted humic substances and tryptophan standards, demonstrating the natural variability of freshwater dissolved organic matter." @default.
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• W2068351432 date "2007-05-01" @default.
• W2068351432 modified "2023-10-10" @default.
• W2068351432 title "Effects of filtration and pH perturbation on freshwater organic matter fluorescence" @default.
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• W2068351432 doi "https://doi.org/10.1016/j.chemosphere.2006.11.024" @default.
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