Copper complexing capacities of freshwaters by adsorptive cathodic stripping voltammetry

Jin, Li; Gogan, Niall J.

doi:10.1016/s0003-2670(00)00763-7

Cited by 25 publications

(17 citation statements)

References 21 publications

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“…Actually, the presence of copper-complexes in surface runoff waters has been reported in the literature. 41 Sedlak et al 42 detailed the presence of moderately strong metal-complexing ligands, which are responsible for the complexation of about 5-50% of the Cu in the dissolved phase. The existence of metal-complexing ligands in surface runoff waters must be accounted for when evaluating runoff management and treating practices.…”

Section: Resultsmentioning

confidence: 99%

“…40,41 Although no complexation studies were carried out in this investigation we were able to examine the relationship between the presence of the three metals in the dissolved phase and the COD levels determined in runoff waters as it is shown in Figure 7. From Figure 7 it is possible to observe a relationship between the concentration of metals in the dissolved phase and the DOC content in the drainage water.…”

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confidence: 99%

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Copper, lead and cadmium loads and behavior in urban stormwater runoff in Curitiba, Brazil

Prestes¹,

Anjos²,

Sodré³

et al. 2006

J. Braz. Chem. Soc.

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O objetivo deste trabalho foi avaliar a presença e o comportamento do Cu, Pb e Cd em águas de drenagem urbana na cidade de Curitiba, no Brasil. As amostras foram coletadas durante 21 eventos de chuva em uma avenida de tráfego médio. As concentrações dos metais foram similares àquelas descritas na literatura, seguindo a ordem Pb>Cu>>Cd. Uma estimativa da carga anual dos três metais para a Bacia do Rio Bacacheri, de 30 km 2 , revelou valores de 1.520, 950 e 25 kg para Pb, Cu e Cd, respectivamente. O chumbo mostrou-se preferencialmente associado ao material particulado (82%), seguido do cádmio (66%) e do cobre (48%). Na fração dissolvida ficou evidenciada uma relação dos metais com a matéria orgânica dissolvida, seguindo a ordem Cu>Pb>Cd. As concentrações dos metais também variaram em função de fatores tais como o primeiro fluxo e o número de dias de estiagem que precedem um evento de chuva.We investigate the presence and behavior of Cu, Pb, and Cd in runoff waters from a residential area located in the city of Curitiba, Brazil. Samples were collected in twenty-one stormwater events in an intermediate traffic way located in the Bacacheri watershed. Metal concentrations were similar to range values compiled worldwide and followed the order: Pb>Cu>>Cd. Unit loads were estimated to the watershed, which cover an area of 30 km 2 , revealing values of 1520, 950, 25 kg for Pb, Cu, and Cd, respectively. Among the three metals, lead showed the greatest affinity for the suspended solids (82%) followed by Cd (66%) and Cu (48%). Meanwhile, an association of the metals with the organic matter in the dissolved phase, following the order Cu>Pb>Cd. Metal loads and behavior in urban runoff also depends on factors such as the first flush and the dry period preceding a storm event.Keywords: heavy metal, urban stormwater runoff, pollution load, nonpoint source IntroductionNonpoint pollution resulting from urban stormwater runoff has been identified as one of the major causes of the deterioration of the quality of surface receiving waters. [1][2][3] During stormwater events water runs on the surface washing away a variety of pollutants alongside the drainage area and reaches, intermittently, receiving water bodies. 4,5 Additionally, in urban areas, impervious surfaces such as roads, bridges, parking lots, and buildings do not allow the slow percolation of the water into the ground. In this case, the water remains above the surface, accumulating and running off in large amounts. 6,7 Many previous studies revealed that nonpoint emissions remain the largest source of water quality problems in developed countries. Nowadays, it is the main reason that approximately 40% of rivers, lakes, and estuaries located in the United States are not clean enough to meet basic uses such as fishing or swimming. 8 In Brazil, as well as in many developing countries, the identification and monitoring of nonpoint sources still represent a great challenge. In fact, this issue has not been properly addressed and the pollutant content of urban surface waters ha...

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Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

Copper, lead and cadmium loads and behavior in urban stormwater runoff in Curitiba, Brazil

Prestes¹,

Anjos²,

Sodré³

et al. 2006

J. Braz. Chem. Soc.

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“…[62][63][64][65][66] On the other hand, ligand titration, namely competitive reactions between natural and artificial organic ligands, has hardly been developed until initial work with EDTA (ethylenediaminetetraacetic acid) carried out in 1982. 67 Recent experimental studies on copper speciation in seawater have revealed more than 99% of copper to be present as organic complexes, of which the conditional stability constants are in the range between 10 9 and 10 15 M -1 .…”

Section: Organic Complexes Of Trace Metalsmentioning

confidence: 99%

Chemical Speciation of Trace Metals in Seawater: a Review

Hirose¹

2006

ANAL. SCI.

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The recent development of the chemical speciation of trace metals in seawater is described. The speciation studies reveal that metal ion complexation is one of the most important processes in seawater; especially, most bioactive trace metals, such as Fe(III) and Cu, exist as complexes with ligands in dissolved organic matter. The organic ligands in seawater are characterized with metal ions selected by the HSAB concept. A strong organic ligand, which originates from marine microorganisms, is classified as a hard base including carboxylates. The free organic ligand concentrations in seawater are buffered by complexation with excess amounts of Ca and Mg in seawater. The chemical equilibrium model suggested that the concentrations of bioactive free metal ions are at an optimal level to activities of marine microorganisms. For chemical speciation, it is important to have a better understanding of the ecological roles of trace metals in seawater.

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“…Moreover, in the last few years, the general interest in SWV [8][9][10][11][12][13][14][15][16][17][18][19] and related techniques [20 -22] has increased consistently. Recently, a number of studies of merit, describing theoretically the application of SWV to the study of different electrode mechanisms at channel [8][9][10], spherical [11,12], and mercury-plated electrodes [13] have been published.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, an alternative means of simulation of miscellaneous electrode mechanisms under conditions of SWV, based on the backward implicit method, has been also presented [14,15]. A few interesting experimental studies have been recently published, in which the applicability of SWV for the study of bioelectrochemical systems [17,18], as well as the determination of stability constants [19], was demonstrated. Finally it is worth noting, that interest in alternating current voltammetry, as a related technique to SWV, has recently been revived [20 -22], and a novel approach in the study of electrode kinetics and trace analysis, based on fast Fourier transform method has been presented [20,21].…”

Section: Introductionmentioning

confidence: 99%

Theoretical and experimental study of the surface redox reaction involving interactions between the adsorbed particles under conditions of square-wave voltammetry

Mirčeski

Lovrić

Gulaboski

2001

Journal of Electroanalytical Chemistry

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A surface redox reaction of a strongly adsorbed redox couple involving interactions between the adsorbed particles was analyzed theoretically under conditions of square-wave voltammetry (SWV). If uniform interactions act between the adsorbed particles, the effect of interaction forces is represented through the product of the relative surface coverage and Frumkin interaction parameter [a. The kinetics of the redox reaction in the presence of uniform interactions are a function of the apparent rate constant defined as k s,app. =k s exp(−2a[), where k s is a real standard rate constant. The apparent reversibility of the redox reaction is determined solely by a dimensionless kinetic parameter defined as the ratio of the apparent rate constant and the signal frequency, =k s,app /f. This dimensionless kinetic parameter unifies the effects of both the interaction forces and the charge transfer rate. The height of the dimensionless response depends parabolically on the kinetic parameter , as a consequence of the phenomenon known as a 'quasireversible maximum'. Based on this peculiarity, a method for estimating the real standard rate constant k s and Frumkin interaction parameter a is proposed. The theoretical results are compared qualitatively with the experimental SW voltammograms of probucole.

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Copper complexing capacities of freshwaters by adsorptive cathodic stripping voltammetry

Cited by 25 publications

References 21 publications

Copper, lead and cadmium loads and behavior in urban stormwater runoff in Curitiba, Brazil

Copper, lead and cadmium loads and behavior in urban stormwater runoff in Curitiba, Brazil

Chemical Speciation of Trace Metals in Seawater: a Review

Theoretical and experimental study of the surface redox reaction involving interactions between the adsorbed particles under conditions of square-wave voltammetry

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