Relative copper binding capacities of dissolved organic compounds in a coastal-plain estuary

Newell, Avis D.; Sanders, James G.

doi:10.1021/es00150a010

Cited by 30 publications

(16 citation statements)

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“…Arsenic is chemically similar to phosphorus in its dominant, inorganic form (arsenate), is readily taken up by phytoplankton, and can undergo reduction and methylation to form a variety of dissolved forms (Andreae 1978;Sanders 1979;Sanders and Windom 1980). Copper can be taken up via a general cation transport system, which also transports zinc and manganese (Sunda Coale andBruland 1988 Andreae 1978;Sanders 1980;Coale and Bruland 1988;Sunda et al 1990 Sunda andGuillard 1976;Nissen and Benson 1982;Blanck et al 1989 Effects of phytoplankton on trace element behavior: Wallace et al 1983Sanders 1983, 1985Moffett and Zika 1987Sanders 1983, 1985Moffett and Zika 1987McKnight and Morel 1979Newell and Sanders 1986;Coale and Bruland 1988 Important biogeochemical processes Reduction and methylation Complexation by DOC increase toxicity reduces toxicity et al 1981); it is also readily complexed by organics exuded from cells, resulting in greatly altered reactivity and biological availability (McKnight and Morel 1979;Fisher and Fabris 1982). In order to accomplish our goals, we performed three experiments during different seasons in outdoor, large-volume enclosures containing natural phytoplankton communities.…”

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confidence: 99%

Trace Element Transformation during the Development of an Estuarine Algal Bloom

Sanders

Riedel

1993

Estuaries

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Copper and arsenic underwent large changes in chemical form during the development and senescence of natural phytoplankton blooms in the Patuxent River, a subestuary of Chesapeake Bay in Maryland. Arsenate was rapidly reduced to arsenite and methylated species. At a total arsenic concentration of 20 nmoll-I , arsenate reduction rates ranged from 50 amol cell-with the rate and extent of reduction dependent upon the concentration of arsenic, the dominant phytoplankton present, the season, and the degree of decline in phosphorus concentrations during bloom development. In general, the percentage of organically-associated copper was lowest (20-40% of total copper) during periods of rapid cell growth and highest (60-100% of total copper) during periods of cell decline or periods of dominance by red tide-forming dinoflagellates, a pattern associated with periods of high release of organic compounds during either bloom senescence or dense algal blooms. The end result of biological mediation was to increase the proportion of each element present in a less toxic form, thus affecting the potential toxicity to a natural ecosystem.

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confidence: 99%

Trace Element Transformation during the Development of an Estuarine Algal Bloom

Sanders

Riedel

1993

Estuaries

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“…In the current study, approximately 67-85% of the DOC was associated with the <10000 daltons nominal molecular weight fraction. Newell and Sanders (1986) also reported that a greater proportion of DOC in Patuxent River estuarine water was found in the smaller molecular weight fraction downstream; percent of total DOC in the < 10000 MW ranged from 65-70% for a salinity from 5.3-13.6, respectively. Within the salinity range of 4-13 ppt for the Ogeechee River, Georgia, a range similar to that of this study, Smith (1976) reported a decreasing percentage of DOC in the higher molecular weight fraction.…”

Section: Discussionmentioning

confidence: 91%

“…In 1982 in the river at Chalk Point ranged from 0.15-2.2, 1-', whereas dissolved copper in the discharge canal was always considerable higher; 1.5-5.2 g 1 - (Abbe & Sanders, 1986). Newell & Sanders (1986) reported values ranging from 2.5-3.2pg1-. In a comprehensive survey of copper levels in the Patuxent River, Eaton and Chamberlain (1980) reported total dissolved copper concentrations of 1-2 pg Cu 1-' during the sampling years of 1977-78.…”

Section: Discussionmentioning

confidence: 93%

“…In fact, the oxidation effect through chlorination may result in a small depression of DOC at the outfall. Newell & Sanders (1986) determined that the copper binding capacity of DOC in the Patuxent River was an order of magnitude higher than the copper concentrations. In the current study, approximately 67-85% of the DOC was associated with the <10000 daltons nominal molecular weight fraction.…”

Section: Discussionmentioning

confidence: 99%

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Copper contamination in the Patuxent River, Maryland

Wright

Zamudal

1991

Hydrobiologia

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Copper contamination was studied in the Patuxent River, Maryland, which flows from the western shore of the Chesapeake Bay. The only heavy industry on this river is a coal-fired power plant situated 35 km from the river mouth. The plant uses river water for cooling purposes and had been implicated in early studies as a source of localized copper pollution from copper: nickel condenser tubing. Average cooling water usage exceeded average natural river flow over the study period by a factor of 3.

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“…In this study, we examined the complexation of copper by fulvic acid (FA) using anodic stripping voltammetry (ASV), and determined how the complexation affected acute toxicity of copper to the larvae of H. elegans. Fulvic acid can account for up to 90% of dissolved humic substances in coastal waters (Porta and Ronco, 1993) and forms complexes with copper (Stevenson, 1982;Newell and Sanders, 1986). ASV labile copper, which includes cupric ion and inorganically bound copper (Florence, 1986), has been shown to correlate well with cupric ion concentration (Allen and Hansen, 1996;Lorenzo et al, 2005;Rivera-Duarte et al, 2005) and considered to be the bioavailable fraction of the metal (Florence, 1986).…”

Section: Introductionmentioning

confidence: 99%

Copper complexation by fulvic acid affects copper toxicity to the larvae of the polychaete Hydroides elegans

Qiu

Tang

Zheng

et al. 2007

Marine Environmental Research

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Copper toxicity is influenced by a variety of environmental factors including dissolved organic matter (DOM). We examined the complexation of copper by fulvic acid (FA), one of the major components of DOM, by measuring the decline in labile copper by anodic stripping voltammetrically (ASV). The data were described using a one-site ligand binding model, with a ligand concentration of 0.19micromol site mg(-1) C, and a logK' of 6.2. The model was used to predict labile copper concentration in a bioassay designed to quantify the extent to which Cu-FA complexation affected copper toxicity to the larvae of marine polychaete Hydroides elegans. The toxicity data, when expressed as labile copper concentration causing abnormal development, were independent of FA concentration and could be modeled as a logistic function, with a 48-h EC(50) of 58.9microgl(-1). However, when the data were expressed as a function of total copper concentration, the toxicity was dependent on FA concentration, with a 48-h EC(50) ranging from 55.6microgl(-1) in the no-FA control to 137.4microgl(-1) in the 20mgl(-1) FA treatment. Thus, FA was protective against copper toxicity to the larvae, and such an effect was caused by the reduction in labile copper due to Cu-FA complexation. Our results demonstrate the potential of ASV as a useful tool for predicting metal toxicity to the larvae in coastal environment where DOM plays an important role in complexing metal ions.

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Relative copper binding capacities of dissolved organic compounds in a coastal-plain estuary

Cited by 30 publications

References 22 publications

Trace Element Transformation during the Development of an Estuarine Algal Bloom

Trace Element Transformation during the Development of an Estuarine Algal Bloom

Copper contamination in the Patuxent River, Maryland

Copper complexation by fulvic acid affects copper toxicity to the larvae of the polychaete Hydroides elegans

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