Effects of the detection window on the determination of organic copper speciation in estuarine waters

Berg, Constant M.G. van den; Nimmo, Malcolm; Daly, Pádraig; Turner, David R.

doi:10.1016/s0003-2670(00)81231-3

Cited by 118 publications

(46 citation statements)

References 37 publications

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“…Despite the increasing number of studies focusing on organic ligands in oceanic and estuarine waters [4,8], only recently recognized is the role of sediments in the control of metal speciation in the water column, particularly in estuaries. Skrabal et al [9] demonstrated that estuarine sediments are a significant source of Cu-complexing ligands to the overlying water, which may, by sediment-water exchange, strongly influence the biogeochemistry and cycling of dissolved Cu.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the response of three microalgae species exposed to elutriates of estuarine sediments based on growth and chemical speciation

Mucha

Leal

Bordalo

et al. 2003

Enviro Toxic and Chemistry

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The elutriate sediment toxicity test (ESTT) provides a measure of the amount of a substance that is exchanged between the sediment and the aqueous phase during resuspension processes such as floods or dredging operations. This study used ESTT with two complementary aims: a comparison of the elutriates of two estuarine sediments (anaerobic muddy [A] and aerobic sandy [B]) in terms of toxicity and a comparison of the response of three different microalgae (Emiliania huxleyi (coccolithophore), Dunaliella minuta (green alga), and Phaeodactylum tricornutum (diatom)) to each elutriate in terms of growth, heavy metals uptake, and organic ligands release or uptake in order to find eventual differences of sensitivity. The interpretation of the results was based on chemical speciation in the culture media. Both elutriates, particularly A, were much richer than seawater (control medium) in some heavy metals and organic ligands able to bind strongly heavy metals. Elutriate A slightly inhibited P. tricornutum growth but stimulated growth of E. huxleyi and D. minuta. Elutriate B stimulated the growth of the three algal species. Therefore, the diatom behaved differently from both the coccolithophore and the green alga. Strong complexation of trace metals by organic ligands could be the cause of absence of the metallic toxicity of the elutriates. Growth inhibition of P. tricornutum in elutriate A could be caused by ammonia-N and/or organic compounds. The concentration of the organic ligands decreased markedly (about 75%) in both elutriates after 10 d of incubation in contrast to the control culture, where their concentration increased about 50% because of exudation. This phenomenon was interpreted to result from ligand uptake by the algae, free or as metal complexes. This work demonstrated that beside the evaluation of toxicity of free heavy metals to alga species, the organic ligands must not be ignored. Depending on the amount of ligand present, the toxicity can be reduced (sequestration) or enhanced (better availability through uptake of metal-ligand complexes). Since the applied ESTT is a standard procedure (U.S. Environmental Protection Agency) for the evaluation of dredged material proposed for ocean disposal, it is necessary to discuss results obtained during toxicity tests with such elutriates in detail.

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Section: Introductionmentioning

confidence: 99%

Comparison of the response of three microalgae species exposed to elutriates of estuarine sediments based on growth and chemical speciation

Mucha

Leal

Bordalo

et al. 2003

Enviro Toxic and Chemistry

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“…As demonstrated in many previous studies (van den Berg, 1984;van den Berg et al, 1990;Donat and van den Berg, 1992;van den Berg and Donat, 1992;Donat et al, 1994), the CLE-CSV technique allows the detection of a relatively strong class of Cu-complexing ligands, with conditional stability constants, K', on the order of 10 13 -10 15 . Observations from oceanic surface waters indicate that concentrations of this very strong ligand class are sufficient to completely complex all TDCu, and control its speciation (Moffett and Zika, 1987a;Sunda and Hanson, 1987;Coale and Bruland, 1988;Sunda and Huntsman, 1991;Donat and van den Berg, 1992).…”

Section: Metal Speciationmentioning

confidence: 90%

Speciation, Fluxes, and Cycling of Dissolved Copper and Zinc in Estuaries: The Roles of Sediment Exchange and Photochemical Effects

Skrabal¹,

Rivera-Duarte²

2005

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Public reporting burden for the collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to a penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. REPORT DATE JUL 20052. REPORT TYPE ABSTRACTCopper (Cu) and zinc (Zn) have numerous sources in naval shipping, berthing, and maintenance facilities. Concentrations of these metals in estuaries and harbors can reach levels which are potentially toxic to biota. Hence, discharges and concentrations of these metals are strictly regulated by environmental quality agencies. Because of pervasive problems associated with discharges and remediation of Cu and Zn in estuaries and harbors, it is essential that regulated agencies and regulators alike understand the factors that influence the availability and cycling behavior of these metals in environments relevant to DoD operations. SUBJECT TERMS

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“…(9) and (13), respectively. Note the huge difference between the initial slopes and the similarity for short times between (13) and a (t/s)/[1 + (t/s)] decay, that would follow from Eqs. (11) and (12) for a constant flux.…”

Section: Kinetics Of the Adsorptive Accumulationmentioning

confidence: 98%

“…Under conditions of excess of L ad over M, the bulk equilibrium distribution is prescribed by the conditional stabilities K of the different species. Thus an effective thermodynamic cut-off window (also referred to as the detection window) is easily defined by comparing the conditional stability K M 0 L 0 of the complexes in the original sample to that of the complexes formed with the added ligand ðK M 0 L 0 ad Þ [12][13][14][15]. We use the notation M 0 L 0 to denote a K that is conditional with respect to both the metal and the ligand; ML 0 denotes a K defined with respect to the free metal ion and conditional for the ligand only.…”

Section: Introductionmentioning

confidence: 99%

Dynamic aspects of metal speciation by competitive ligand exchange–adsorptive stripping voltammetry (CLE–AdSV)

Leeuwen

Jansen

2005

Journal of Electroanalytical Chemistry

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Effects of the detection window on the determination of organic copper speciation in estuarine waters

Cited by 118 publications

References 37 publications

Comparison of the response of three microalgae species exposed to elutriates of estuarine sediments based on growth and chemical speciation

Comparison of the response of three microalgae species exposed to elutriates of estuarine sediments based on growth and chemical speciation

Speciation, Fluxes, and Cycling of Dissolved Copper and Zinc in Estuaries: The Roles of Sediment Exchange and Photochemical Effects

Dynamic aspects of metal speciation by competitive ligand exchange–adsorptive stripping voltammetry (CLE–AdSV)

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