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The authors discuss the voltammetric methods that are used to assess metal–…


Biology Articles » Hydrobiology » Marine Biology » Metal–organic complexation in the marine environment » Figures

Figures
- Metal–organic complexation in the marine environment

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Figure 1 Cyclic voltammograms of (A) 100 μM inorganic Zn in seawater and (B) 100 μM Zn with 50 μM NTA. Peak 2 is due to the reduction of Zn in ZnNTA2. Peak 1 in each CV is due to inorganic Zn reduction and peak 3 is due to the oxidation of Zn in the amalgam.

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Figure 2 ASV titration of a Delaware Bay sample (A); Langmuir transformation of the titration data (B) and Scatchard-Langmuir transformation of the titration data. 1/slope = [L] = 36.1 nM and K = 1/(intercept [L]) (log K = 9.03).

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Figure 3 Data for log Fecond Fe(III)L complexes (A) CLE-CSV at pH = 7 using 1N2N as the competitive ligand and (B) kinetic method at pH = 8 using SAL as the competitive ligand.

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Figure 4 Data for log Fecond Fe(III)L complexes (A) CLE-CSV at pH = 7 and (B) kinetic method at pH = 8 using 1N2N as the competitive ligand.

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Figure 5 (A) Square wave voltammogram of 100 μM Zn with 50 μM NTA and (B) pseudovoltammogram of 10 nM Zn with 500 nM NTA using anodic stripping square wave voltammetry.

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Figure 6 A plot of E'1/2 from pseudovoltammograms vs. log Ktherm for Zn-organic complexes dissolved in seawater. 1 = oxalic acid; 2 = CTP; 3 = ethylenediamine; 4 = glycine; 5 = 8-hydroxyquinoline; 6 = iminobis(metnylenephosphonic acid); 7 = EDDA; 8 = NTA as Zn(NTA)2. The numbers 9–11 refer to unknown complexes in Delaware Bay waters (see Fig. 7).

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Figure 7 (A) Pseudovoltammogram of a rainwater sample from Lewes, Delaware on 5 September 1992; (B) pseudovoltammogram of Delaware Bay water on 26 June 1992.

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Figure 8 A plot of E'1/2 from pseudovoltammograms vs. log Ktherm for Cu(II)-organic complexes dissolved in seawater. Blue symbols are from cultures and green symbols are from natural waters as indicated.

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Figure 9 A plot of E'p from square wave voltammograms vs. log Ktherm for Fe(III)-organic complexes dissolved in 0.1 M KC1. Numbers refer to compounds in Table 2.

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Figure 10 Hyperchem MM + 2 calculation for the FeL2 complex from a decapeptide prepared from Mytilus edulis foot protein 1. The two decapeptide ligands appear to interact to stabilize the complex and prevent dissociation. The log Ktherm estimated is 40.2 vs. 34.7 for the bis(catechol) complex. The Fe atom bound to six oxygen atoms is in the upper left part of the figure.

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