Voltammetric determination of the metal complexing capacity in model solutions
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Cited by (22)
Evaluation of diffusive gradients in thin films (DGT) technique for speciation of trace metals in estuarine waters - A multimethodological approach
2020, Science of the Total EnvironmentCitation Excerpt :Indeed, the effective time of the measurement for the ASV is ~0.1 s, with a diffusion layer thickness of ~10 μm, and a diffusion coefficient of 5 × 10−6 cm2 s−1, whereas in the DGT device the diffusion layer thickness is ~0.9 mm and the effective measurement time is ~13.5 min (Zhang and Davison, 2000). Both techniques are sensitive to inorganic Cu species, but also to kinetically labile weak Cu organic complexes, although some labile species for the DGT might be inert to ASV which is having a stronger discrimination towards accumulation of organic complexes (Ferreira et al., 2008; Mongin et al., 2011; Omanović et al., 1996; Scally et al., 2003; Scally et al., 2006; Uribe et al., 2011). This is consistent with complexation titration experiments for which curvature relationship of ASV-labile with the total Cu is usually obtained if compared to DGT-labile titration curve for which curvature trend was not observed (Apte et al., 2005; Louis et al., 2008).
ProMCC: An all-in-one tool for trace metal complexation studies
2015, Marine ChemistryCitation Excerpt :The main purpose of metal speciation analysis, i.e. the determination of complexation parameters, is to estimate (I) the metal speciation at actual concentration of the natural sample and (II) the ability of the “sample” to complex metals at their increased concentration (to predict the metal speciation). Although different methods and protocols of direct characterization of metal–organic complex are reported in literature (Wiramanaden et al., 2008), due to very low concentration of metals in seawater and experimental limitations of separation, extraction and measurement of different metal complexes, an alternate indirect approach in characterization of metal–organic ligand interactions is usually practiced by marine chemists (Bruland et al., 2000; Buck et al., 2012; Campos and Van Den Berg, 1994; Capodaglio et al., 1995; Gerringa et al., 1995; Louis et al., 2009a; Monticelli et al., 2010; Omanović et al., 1996; Plavšić et al., 2009; Ružić, 1982; Van Den Berg, 1982). It is based on the titration of the sample by the target metal at natural pH. Upon addition, metal is redistributed between different species, among them one (or group) of them is used as an “active” component for measurement, whereas the rest is considered to represent undetectable organic complexes.
Significance of data treatment and experimental setup on the determination of copper complexing parameters by anodic stripping voltammetry
2010, Analytica Chimica ActaCitation Excerpt :The variation of experimental procedures is further extended on sample S2 (salinity 38). Again the effect of equilibration time is tested, while in addition, the influence of surface active substance (SAS, 2 mg L−1 of Triton-X-100) is inspected, based on its positive effect registered in solutions with model ligands (EDTA) [41]. For all three procedures, 300 s of accumulation time is applied.
Copper speciation by competing ligand exchange method using differential pulse anodic stripping voltammetry with ethylenediaminetetraacetic acid (EDTA) as competing ligand
2008, Analytica Chimica ActaCitation Excerpt :This was immediately followed by DPASV determination. Since the deposition potentials used in the ASV studies of copper–EDTA complex by other workers spanned the range from −1.4 to 0.0 V [23–26,13], for this study the deposition potential scan was set to start from −1.6 V (initial) to 0.3 V (final). Fig. 1 presents two pseudopolarograms for Cu, with and without EDTA, in ultrapure water (model solution).