Specific ultra-violet absorbance as an indicator of mercury sources in an Adirondack River basin

Burns, Douglas A.; Aiken, George R.; Bradley, Paul M.; Journey, Celeste A.; Schelker, Jakob

doi:10.1007/s10533-012-9773-5

Cited by 32 publications

(42 citation statements)

References 56 publications

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“…The relationship was strong enough in some regions for researchers to suggest special spectral characteristics (e.g., SUVA 254 ) of DOM as a surrogate for predicting temporal and spatial variation in Hg concentration distributions (Dittman et al, 2009;Burns et al, 2013). We argue that the complicated and diverse biogeochemical factors altered the DOM characteristics in a way that obscures the correlation between dissolved Hg and SUVA along the Xiaoqing River-Laizhou Bay estuary transect.…”

Section: Decoupling Between Spatial Distributions Of Dom and Hgmentioning

confidence: 81%

“…Furthermore, the chemical reactivity of DOM mostly depends upon its intrinsic chemical structure such as its aromatic components, molecular weight, and degree of humification. The correlation between "structure and reactivity" may be useful to elucidate the role of DOM in a number of reactions of importance for the environmental fate of pollutants (Weishaar et al, 2003;Dittman et al, 2009;Burns et al, 2013). Environmental studies to an increasing extent rely upon spectrophotometric analyses to reveal, through optical properties, spatial and temporal variability in the composition of DOM in aquatic systems.…”

Section: Introductionmentioning

confidence: 99%

“…Optical properties of DOM originating from different environmental sources have been studied freshwater systems (Dittman et al, 2009;Burns et al, 2013). Dissolved organic carbon (DOC) and DOM quality parameters, derived from the UV-Vis absorption spectrum (e.g., specific UV absorbance, spectral slope), were used to explain the relationship between DOM and Hg (Dittman et al 2009;Burns et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…Dissolved organic carbon (DOC) and DOM quality parameters, derived from the UV-Vis absorption spectrum (e.g., specific UV absorbance, spectral slope), were used to explain the relationship between DOM and Hg (Dittman et al 2009;Burns et al, 2013). Although a strong positive correlation between Hg and DOC concentration have been observed, suggesting Hg mobility in aquatic systems to be associated with DOM (Mierle and Ingram 1991;Dittman et al, 2009;Bergamaschi et al 2012), across aquatic systems with diverse geochemical processes and sources of DOM, the positive correlation between Hg and DOC is not always consistent.…”

Section: Introductionmentioning

confidence: 99%

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Characteristics of dissolved organic matter (DOM) and relationship with dissolved mercury in Xiaoqing River-Laizhou Bay estuary, Bohai Sea, China

Jiang

Skyllberg

Björn

et al. 2017

Environmental Pollution

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a b s t r a c tBecause of heterogeneous properties, dissolved organic matter (DOM) is known to control the environmental fate of a variety of organic pollutants and trace metals in aquatic systems. Here we report absorptive and fluorescence properties of DOM, in concurrence with concentrations of dissolved mercury (Hg), along the Xiaoqing River-Laizhou Bay estuary system located in the Bohai Sea of China. A mixing model consisting of the two end-members terrestrial and aquatic DOM demonstrated that terrestrial signatures decreased significantly from the river into the estuary. Quasi-conservative mixing behavior of DOM sources suggests that the variations in the average DOM composition were governed by physical processes (e.g., dilution) rather than by new production and/or degradation processes. In contrast to some previous studies of river-estuary systems, the Xiaoqing River-Laizhou Bay estuary system displayed a non-significant correlation between DOM and Hg quantities. Based on this and the variation of Hg concentration along the salinity gradient, we concluded that Hg showed a non-conservative mixing behavior of suggested end-member sources. Thus, rather than mixing, Hg concentration variations seemed to be controlled by biogeochemical processes.

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Section: Decoupling Between Spatial Distributions Of Dom and Hgmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Characteristics of dissolved organic matter (DOM) and relationship with dissolved mercury in Xiaoqing River-Laizhou Bay estuary, Bohai Sea, China

Jiang

Skyllberg

Björn

et al. 2017

Environmental Pollution

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“…Due to the strong affinity of dissolved Hg for DOC, especially reduced sulfur moieties (Haitzer et al, 2002;Haitzer et al, 2003;Gerbig et al, 2011), concentrations of DOC and total dissolved Hg are generally observed to be positively correlated in natural waters (Schuster et al, 2008;Dittman et al, 2009;Dittman et al, 2010;Burns et al, 2012a). We are not aware of any mercury monitoring in the Fraser River by federal or provincial government agencies, despite multiple recommendations to establish such monitoring (MacDonald et al, 2011).…”

Section: Biogeochemical Dynamics Of Doc Have Not Previously Been Invementioning

confidence: 99%

Spatial and temporal dynamics of biogeochemical processes in the Fraser River, Canada : a coupled organic-inorganic perspective

Voß¹

2014

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The great geologic and climatic diversity of the Fraser River basin in southwestern Canada render it an excellent location for understanding biogeochemical cycling of sediments and terrigenous organic carbon in a relatively pristine, large, temperate watershed. Sediments delivered by all tributaries have the potential to reach the ocean due to a lack of main stem lakes or impoundments, a unique feature for a river of its size. This study documents the concentrations of a suite of dissolved and particulate organic and inorganic constituents, which elucidate spatial and temporal variations in chemical weathering (including carbonate weathering in certain areas) as well as organic carbon mobilization, export, and biogeochemical transformation. Radiogenic strontium isotopes are employed as a tracer of sediment provenance based on the wide variation in bedrock age and lithology in the Fraser basin. The influence of sediments derived from the headwaters is detectable at the river mouth, however more downstream sediment sources predominate, particularly during high discharge conditions. Bulk radiocarbon analyses are used to quantify terrestrial storage timescales of organic carbon and distinguish between petrogenic and biospheric organic carbon, which is critical to assessing the role of rivers in long-term atmospheric CO 2 consumption. The estimated terrestrial residence time of biospheric organic carbon in the Fraser basin is 650 years, which is relatively short compared to other larger rivers (Amazon, Ganges-Brahmaputra) in which this assessment has been performed, and is likely related to the limited floodplain storage capacity and non-steadystate post-glacial erosion state of the Fraser River. A large portion of the dissolved inorganic carbon load of the Fraser River (>80%) is estimated to derive from remineralization of dissolved organic carbon, particularly during the annual spring freshet when organic carbon concentrations increase rapidly. This thesis establishes a baseline for carbon cycling in a largely unperturbed modern mid-latitude river system and establishes a framework for future process studies on the mechanisms of organic carbon turnover and organic matter-mineral associations in river systems.

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Drivers of increased organic carbon concentrations in stream water following forest disturbance: Separating effects of changes in flow pathways and soil warming

et al. 2013

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[1] Forest disturbance such as clear-cutting has been identified as an important factor for increasing dissolved organic carbon (DOC) concentrations in boreal streams. We used a long-term data set of soil temperature, soil moisture, shallow groundwater (GW) levels, and stream DOC concentrations from three boreal first-order streams to investigate mechanisms causing these increases. Clear-cutting was found to alter soil conditions with warmer and wetter soils during summer. The application of a riparian flow concentration integration model (RIM) explained a major part of variation in stream [DOC] arising from changing flow pathways in riparian soils during the pretreatment period (r 2 = 0.4-0.7), but less well after the harvest. Model residuals were sensitive to changes in soil temperature. The linear regression models for the temperature dependence of [DOC] in soils were not different in the disturbed and undisturbed catchments, whereas a nonlinear response to soil moisture was found. Overall these results suggest that the increased DOC mobilization after forest disturbance is caused by (i) increased GW levels leading to increased water fluxes in shallow flow path in riparian soils and (ii) increased soil temperature increasing the DOC availability in soils during summer. These relationships indicate that the mechanisms of DOC mobilization after forest disturbance are not different to those of undisturbed catchments, but that catchment soils respond to the higher hydro-climatic variation observed after clear-cutting. This highlights the sensitivity of boreal streams to changes in the energy and water balance, which may be altered as a result of both land management and climate change.Citation: Schelker, J., T. Grabs, K. Bishop, and H. Laudon (2013), Drivers of increased organic carbon concentrations in stream water following forest disturbance: Separating effects of changes in flow pathways and soil warming, J. Geophys.

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Specific ultra-violet absorbance as an indicator of mercury sources in an Adirondack River basin

Abstract: FTHg and SUVA 254 that are characteristic of source areas that control the mobilization of Hg to surface waters, and that the seasonal influence of these source areas varies in this heterogeneous basin landscape.

Cited by 32 publications

References 56 publications

Characteristics of dissolved organic matter (DOM) and relationship with dissolved mercury in Xiaoqing River-Laizhou Bay estuary, Bohai Sea, China

Characteristics of dissolved organic matter (DOM) and relationship with dissolved mercury in Xiaoqing River-Laizhou Bay estuary, Bohai Sea, China

Spatial and temporal dynamics of biogeochemical processes in the Fraser River, Canada : a coupled organic-inorganic perspective

Drivers of increased organic carbon concentrations in stream water following forest disturbance: Separating effects of changes in flow pathways and soil warming

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