Transformation of dissolved organic matter and associated metals in boreal mire and river waters: Effects of biota and sunlight DOI Creative Commons

O. Yu. Drozdova,

A. R. Aleshina,

S. A. Lapitskiy

и другие.

Water Research, Год журнала: 2025, Номер 282, С. 123756 - 123756

Опубликована: Май 1, 2025

Despite the undeniable importance of bio- and photo-degradation dissolved organic matter (DOM) in carbon (C) cycle natural waters, combined effects these processes on C trace metal concentrations remain largely unexplored. In particular, a central question remains partitioning major metals DOM dissolved, colloidal, particular fractions presence sunlight microorganism. this study, we selected two contrasting yet representative water samples from European boreal region: an acidic mire (pH = 4.3, DOC 130 mg L-1) neutral river 7.6, 39 L-1). By analyzing solutes particulate (0.22-100 µm), colloidal (1 kDa-0.22 low molecular weight (LMW<1kDa) fractions, tracked changes quality (dissolved carbon) pools during 10-day exposure to incubation with native bacterial consortium (with without sunlight). The susceptibility inorganic colloids photo- biodegradation was influenced by pH aqueous solutions, significant differences behavior DOC, Fe, between water. However, both cases, photodegradation dominant process over biodegradation, most substantial solute concentration observed treatment Collectively, experiments demonstrate effect photolysis DOM, among particulate, (LMW) 'truly' fractions. Significant changes, ranging 1.5 3 times concentrations, can occur relatively short periods (< 1 week) vary substantially small bodies acidity concentrations. These findings highlight need for further research into processes, focus seasonal variations, residence times, biotic activity.

Язык: Английский

Transformation of dissolved organic matter and associated metals in boreal mire and river waters: Effects of biota and sunlight DOI Creative Commons

O. Yu. Drozdova,

A. R. Aleshina,

S. A. Lapitskiy

и другие.

Water Research, Год журнала: 2025, Номер 282, С. 123756 - 123756

Опубликована: Май 1, 2025

Despite the undeniable importance of bio- and photo-degradation dissolved organic matter (DOM) in carbon (C) cycle natural waters, combined effects these processes on C trace metal concentrations remain largely unexplored. In particular, a central question remains partitioning major metals DOM dissolved, colloidal, particular fractions presence sunlight microorganism. this study, we selected two contrasting yet representative water samples from European boreal region: an acidic mire (pH = 4.3, DOC 130 mg L-1) neutral river 7.6, 39 L-1). By analyzing solutes particulate (0.22-100 µm), colloidal (1 kDa-0.22 low molecular weight (LMW<1kDa) fractions, tracked changes quality (dissolved carbon) pools during 10-day exposure to incubation with native bacterial consortium (with without sunlight). The susceptibility inorganic colloids photo- biodegradation was influenced by pH aqueous solutions, significant differences behavior DOC, Fe, between water. However, both cases, photodegradation dominant process over biodegradation, most substantial solute concentration observed treatment Collectively, experiments demonstrate effect photolysis DOM, among particulate, (LMW) 'truly' fractions. Significant changes, ranging 1.5 3 times concentrations, can occur relatively short periods (< 1 week) vary substantially small bodies acidity concentrations. These findings highlight need for further research into processes, focus seasonal variations, residence times, biotic activity.

Язык: Английский

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