Trace Metals and Dissolved Organic Carbon in an Estuary with Restricted River Flow and a Brown Tide Bloom

Estuaries ◽  
1999 ◽  
Vol 22 (3) ◽  
pp. 603 ◽  
Author(s):  
Eric Breuer ◽  
Sergio A. Sañudo-Wilhelmy ◽  
Robert C. Aller ◽  
Sergio A. Sanudo-Wilhelmy
Keyword(s):  
Trace Metals ◽  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
River Flow ◽  
Brown Tide ◽  
Brown Tide Bloom

The influence of dissolved organic carbon, suspended particulates, and hydrology on the concentration, partitioning and variability of trace metals in two contrasting Wisconsin watersheds (U.S.A.)

1997 ◽  
Vol 136 (1-2) ◽  
pp. 71-97 ◽  
Author(s):  
Martin M. Shafer ◽  
Joel T. Overdier ◽  
James P. Hurley ◽  
David Armstrong ◽  
David Webb
Keyword(s):  
Trace Metals ◽  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Suspended Particulates

scholarly journals Long term patterns in dissolved organic carbon, major elements and trace metals in boreal headwater catchments: trends, mechanisms and heterogeneity

2012 ◽  
Vol 9 (12) ◽  
pp. 19121-19163 ◽  
Author(s):  
S. K. Oni ◽  
M. N. Futter ◽  
K. Bishop ◽  
S. J. Köhler ◽  
M. Ottosson-Löfvenius ◽  
...  
Keyword(s):  
Water Quality ◽  
Trace Metals ◽  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Temporal Trends ◽  
Control Surface ◽  
Surface Water Hydrology ◽  
Organic Carbon Concentration ◽  
Increasing Trend

Abstract. The boreal landscape is a complex, spatio-temporally varying mosaic of forest and mire landscape elements that control surface water hydrology and chemistry. Here, we assess long-term water quality time-series from three nested headwater streams draining upland forest (C2), peat/mire (C4) and mixed (C7) (forest and mire) catchments. Temporal trends in weather and runoff (1981–2008); dissolved organic carbon concentration [DOC] (1993–2010) and other water quality parameters (1987–2011) were assessed. There was no significant annual trend in precipitation or runoff but a significant monotonic increasing trend existed in air temperature and length of growing season. Stream [DOC] was positively correlated with some trace metals (copper, iron and zinc) and negatively with several other chemical parameters (e.g. sulfate, conductivity, calcium). Both sulfate and conductivity showed declining trends, while a significant increase was observed in pH during winter and spring. Calcium and magnesium showed monotonic decreasing trends. The declining trajectories of stream base cation and sulfate concentrations during other times of the year were not accompanied by changes in pH and alkalinity. Water temperature increased significantly both annually and in most months while iron and DOC concentrations showed significant increases in autumn months. Though all streams showed significant positive trends in [DOC] in autumn, only C2 had a significant annual increasing trend. There was also a shift in the magnitude of variability in spring [DOC] and increasing trend of summer baseflow [DOC] in C2 and C7.

scholarly journals Long-term patterns in dissolved organic carbon, major elements and trace metals in boreal headwater catchments: trends, mechanisms and heterogeneity

2013 ◽  
Vol 10 (4) ◽  
pp. 2315-2330 ◽  
Author(s):  
S. K. Oni ◽  
M. N. Futter ◽  
K. Bishop ◽  
S. J. Köhler ◽  
M. Ottosson-Löfvenius ◽  
...  
Keyword(s):  
Water Quality ◽  
Trace Metals ◽  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Temporal Trends ◽  
Monotonic Increase ◽  
Surface Water Hydrology ◽  
Organic Carbon Concentration ◽  
Recovery From Acidification

Abstract. The boreal landscape is a complex, spatio-temporally varying mosaic of forest and mire landscape elements that control surface water hydrology and chemistry. Here, we assess long-term water quality time series from three nested headwater streams draining upland forest (C2), peat/mire (C4) and mixed (C7) (forest and mire) catchments. Acid deposition in this region is low and is further declining. Temporal trends in weather and runoff (1981–2008), dissolved organic carbon concentration [DOC] (1993–2010) and other water quality parameters (1987–2011) were assessed. There was no significant annual trend in precipitation or runoff. However, runoff increased in March and declined in May. This suggested an earlier snowmelt regime in recent years. Significant monotonic increasing trends in air temperature and length of growing season suggested a decrease in snowfall and less spring runoff. Stream [DOC] was positively correlated with some trace metals (copper, iron and zinc) and negatively with several other chemical parameters (e.g. sulfate, conductivity, calcium). Both sulfate and conductivity showed declining trends, while a significant increase was observed in pH during winter and spring. Calcium and magnesium showed monotonic decreasing trends. The declining trajectories of stream base cation and sulfate concentrations during other times of the year were not accompanied by changes in pH and alkalinity. These results indicate subtle effects of recovery from acidification. Water temperature increased significantly both annually and in most months. A simultaneous monotonic increase in iron (Fe) and [DOC] in autumn suggests co-transport of Fe-DOC in the form of organometallic complexes. A monotonic increase in UV absorbance in most months without co-occurring changes in DOC trend suggests a shift in DOC quality to a more humic-rich type. The observed increase in soil solution [DOC] and subtle trends in stream [DOC] suggest that climate rather than recovery from acidification is the dominant driver of DOC trends in the Svartberget catchment.

Sorption of Trace Metals by Standard and Micro Suction Cups in the Absence and Presence of Dissolved Organic Carbon

2006 ◽  
Vol 35 (1) ◽  
pp. 50-60 ◽  
Author(s):  
D. Rais ◽  
B. Nowack ◽  
R. Schulin ◽  
J. Luster
Keyword(s):  
Trace Metals ◽  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Suction Cups ◽  
Micro Suction Cups

Trace metals and dissolved organic carbon in estuaries and offshore waters of New Jersey, USA

1991 ◽  
Vol 55 (12) ◽  
pp. 3647-3656 ◽  
Author(s):  
Lusheng Yan ◽  
Robert F. Stallard ◽  
Robert M. Key ◽  
David A. Crerar
Keyword(s):  
New Jersey ◽  
Trace Metals ◽  
Organic Carbon ◽  
Dissolved Organic Carbon

scholarly journals From canals to the coast: dissolved organic matter and trace metal composition in rivers draining degraded tropical peatlands in Indonesia

2020 ◽  
Vol 17 (7) ◽  
pp. 1897-1909 ◽  
Author(s):  
Laure Gandois ◽  
Alison M. Hoyt ◽  
Stéphane Mounier ◽  
Gaël Le Roux ◽  
Charles F. Harvey ◽  
...  
Keyword(s):  
Organic Matter ◽  
Trace Metals ◽  
Organic Carbon ◽  
Dissolved Organic Matter ◽  
Dissolved Organic Carbon ◽  
Trace Metal ◽  
Strong Association ◽  
Secondary Source ◽  
Tropical Peatlands ◽  
Blackwater Rivers

Abstract. Worldwide, peatlands are important sources of dissolved organic matter (DOM) and trace metals (TMs) to surface waters, and these fluxes may increase with peatland degradation. In Southeast Asia, tropical peatlands are being rapidly deforested and drained. The blackwater rivers draining these peatland areas have high concentrations of DOM and the potential to be hotspots for CO2 release. However, the fate of this fluvial carbon export is uncertain, and its role as a trace metal carrier has never been investigated. This work aims to address these gaps in our understanding of tropical peatland DOM and associated elements in the context of degraded tropical peatlands in Indonesian Borneo. We quantified dissolved organic carbon and trace metal concentrations in the dissolved and fine colloidal (<0.22 µm) and coarse colloidal (0.22–2.7 µm) fractions and determined the characteristics (δ13C, absorbance, fluorescence: excitation-emission matrix and parallel factor – PARAFAC – analysis) of the peatland-derived DOM as it drains from peatland canals, flows along the Ambawang River (blackwater river) and eventually mixes with the Kapuas Kecil River (whitewater river) before meeting the ocean near the city of Pontianak in West Kalimantan, Indonesia. We observe downstream shifts in indicators of in-stream processing. An increase in the δ13C of dissolved organic carbon (DOC), along with an increase in the C1∕C2 ratio of PARAFAC fluorophores, and a decrease in SUVA (specific UV absorbance) along the continuum suggest the predominance of photo-oxidation. However, very low dissolved oxygen concentrations also suggest that oxygen is quickly consumed by microbial degradation of DOM in the shallow layers of water. Blackwater rivers draining degraded peatlands show significantly higher concentrations of Al, Fe, Pb, As, Ni and Cd compared to the whitewater river. A strong association is observed between DOM, Fe, As, Cd and Zn in the dissolved and fine colloid fraction, while Al is associated with Pb and Ni and present in a higher proportion in the coarse colloidal fraction. We additionally measured the isotopic composition of lead released from degraded tropical peatlands for the first time and show that Pb originates from anthropogenic atmospheric deposition. Degraded tropical peatlands are important sources of DOM and trace metals to rivers and a secondary source of atmospherically deposited contaminants.

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