Reactivity of dissolved organic matter in response to acid deposition

Ekström, Sara; Sandahl, Margareta; Nilsson, P. Anders; Kleja, Dan Berggren; Kritzberg, Emma S.

doi:10.1007/s00027-015-0453-0

Cited by 10 publications

(12 citation statements)

References 57 publications

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“…Lakes in this region have been a focal point for extensive research on the long-term ecosystem effects of acidification. , Since the implementation of the Clean Air Act Amendments of 1990, acid-impacted Adirondack lakes have undergone varying extents of recovery from decreases in acid deposition as evidenced by decadal increases in pH, acid neutralizing capacity (ANC), and dissolved organic carbon (DOC) as well as a concomitant decrease in inorganic monomeric aluminum (Al) in their surface waters. − Similar to other inland waters across the temperate and boreal regions of North America and Europe, many Adirondack lakes have shown signs of “browning” due to strong land-water linkages in their watersheds . Long-term monitoring records and experimental studies have hypothesized that the increasing watershed export of dissolved organic matter (DOM) and associated iron (Fe) is a primary driver of surface water browning among other factors, − although DOM quality is sensitive to local hydrogeochemical changes and regional climatic variations and does not necessarily covary with DOC. − …”

Section: Introductionmentioning

confidence: 99%

Photochemical Characterization of Surface Waters from Lakes in the Adirondack Region of New York

Wasswa

Driscoll

Zeng

2020

Environ. Sci. Technol.

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The Adirondack Mountain region of New York, a historical hotspot for atmospheric sulfur and nitrogen deposition, features abundant lakes that are experiencing browning associated with recovery from acidification. Yet, much remains unknown about the photoreactivity of Adirondack lake waters. We quantified the apparent quantum yields (Φ app,RI ) of photochemically produced reactive intermediates (RIs), such as excited triplet states of dissolved organic matter ( 3 DOM*), singlet oxygen ( 1 O 2 ), and hydroxyl radicals ( • OH), for surface waters collected from 16 representative Adirondack lakes. Φ app, 3 DOM* and Φ app, 1 O 2 for native Adirondack lake waters fell within ranges reported for whole waters and DOM isolates from various sources, while Φ app, • OH were substantially lower than those measured for other aquatic samples. Orthogonal partial least squares and multiple linear regression analyses identified the spectral slope coefficient from 290 to 400 nm (S 290−400 ) as the most effective predictor of Φ app,RI among measured water chemistry parameters and bulk DOM properties. Φ app,RI also exhibited divergent responses to controlled pH adjustment and aluminum or iron addition simulating hypothetical scenarios relevant to past and future water chemistry conditions of Adirondack lakes. This study highlights the need for continued research on changes in photoreactivity of acid-impacted aquatic ecosystems in response to browning and subsequent impacts on photochemical processes.

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Section: Introductionmentioning

confidence: 99%

Photochemical Characterization of Surface Waters from Lakes in the Adirondack Region of New York

Wasswa

Driscoll

Zeng

2020

Environ. Sci. Technol.

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“…Worrall and Burt 17 noted that reductions in the ionic strength of soil pore water would lead to increases in DOC solubility that in turn could cause more hydrophobic compounds to become mobile. Others 15,16 have also shown that such increases in DOC solubility correspond with a shift of NOM quality toward more hydrophobic, aromatic, and colored NOM with higher molecular weights.…”

Section: Environmental Science and Technologymentioning

confidence: 94%

Lake Recovery Through Reduced Sulfate Deposition: A New Paradigm for Drinking Water Treatment

Anderson

Krkošek²,

Stoddart

et al. 2017

Environ. Sci. Technol.

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This study examined sulfate deposition in Nova Scotia from 1999 to 2015, and its association with increased pH and organic matter in two protected surface water supplies (Pockwock Lake and Lake Major) located in Halifax, Nova Scotia. The study also examined the effect of lake water chemistry on drinking water treatment processes. Sulfate deposition in the region decreased by 68%, whereas pH increased by 0.1-0.4 units over the 16-year period. Average monthly color concentrations in Pockwock Lake and Lake Major increased by 1.7 and 3.8×, respectively. Accordingly, the coagulant demand increased by 1.5 and 3.8× for the water treatment plants supplied by Pockwock Lake and Lake Major. Not only was this coagulant increase costly for the utility, it also resulted in compromised filter performance, particularly for the direct-biofiltration plant supplied by Pockwock Lake that was found to already be operating at the upper limit of the recommended direct filtration thresholds for color, total organic carbon and coagulant dose. Additionally, in 2012-2013 geosmin occurred in Pockwock Lake, which could have been attributed to reduced sulfate deposition as increases in pH favor more diverse cyanobacteria populations. Overall, this study demonstrated the impact that ambient air quality can have on drinking water supplies.

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“…Hence, sites with soils that were least able to buffer the effects of deposited acidity were the most responsive. The links with changes in atmospheric deposition have since been supported by studies of soil cores (Clark et al, 2011) and field experiments (Evans et al, 2012;Ekström et al, 2015). Hruska et al (2009) demonstrated that ionic strength (a measure of the electric charge produced by ions in water) is a particularly effective chemical predictor of change 110 in DOC.…”

Section: What Is Driving Dom Increases?mentioning

confidence: 99%

“…Shifts in stream DOC character, and hence treatability, are also possible following changes in flow path routing as a result of DOC inputs from different source pools (Hood et al, 2006). Long-term increases in DOC in southern Sweden have been linked to the combination of decreasing sulphate deposition and a multi-120 decadal increase in precipitation and consequently river flow (Erlandsson et al, 2008). Future climate change, particularly in relation to increasing temperatures and a change in total rainfall and an increase in the intensity of storm events (Met Office, 2019) is therefore likely to influence future DOM trajectories and has the potential to become the dominant driver as atmospheric pollutant deposition declines toward pre-industrial levels.…”

Section: What Is Driving Dom Increases?mentioning

confidence: 99%

Will UK peatland restoration reduce dissolved organic matter concentrations in upland drinking water supplies?

Williamson

Evans

Spears

et al. 2020

Preprint

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Abstract. Rising dissolved organic matter (DOM) concentrations, and associated increases in water colour, have posed a potential problem for the UK water industry since the phenomenon was first reported in the early 1990s. Elevated DOM concentrations in raw water are of particular concern in upland catchments dominated by organic soils where DOM production tends to be highest. In recent years, water companies have considered the capacity for catchment interventions to improve raw water quality at source, relieving the need for costly and complex engineering solutions in treatment works, but there is considerable uncertainty around the effectiveness of these measures. One of the primary evidence gaps is the extent to which catchment management is capable of influencing DOM concentrations at the point of abstraction, field studies rarely extending beyond sub-catchment or stream scale. Our review of the published evidence suggests that catchment management could make a contribution to mitigating recent DOM increases in some circumstances, particularly where plantation forestry has been grown on peat, and where control of nutrients in runoff could reduce in-reservoir DOM production. Evidence for the efficacy of most other measures that target reductions in DOM loading for catchment to reservoir remains insufficient to support wider scale application. Collectively, these measures have the potential to reduce DOM concentrations in drinking water reservoirs but they must be selected on a site-specific basis, where the scale, effect size and duration of the catchment intervention are considered in relation to both the treatment capacity of the works and future projected DOM trends.

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Reactivity of dissolved organic matter in response to acid deposition

Cited by 10 publications

References 57 publications

Photochemical Characterization of Surface Waters from Lakes in the Adirondack Region of New York

Photochemical Characterization of Surface Waters from Lakes in the Adirondack Region of New York

Lake Recovery Through Reduced Sulfate Deposition: A New Paradigm for Drinking Water Treatment

Will UK peatland restoration reduce dissolved organic matter concentrations in upland drinking water supplies?

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