Theoretical aspects of dynamic metal speciation with electrochemical techniques
Source abstract
Abstract
Understanding the reaction-diffusion processes of metal species is essential for an adequate description and control of metal availability. Electroanalytical techniques are well suited to probe dynamic speciation in aqueous systems, because transport and reaction influence the current. This short review hinges on the quantification of the contribution of complexes to the resulting flux via the lability degree, while highlighting extensions and other approaches. The reaction scheme is the Chemical Electrochemical (CE) mechanism, but special emphasis is focussed in mixtures of ligands given their relevance in natural waters. Despite the intensive theoretical work devoted to dynamic speciation, there is still a need of further progress, especially regarding heterogeneous ligands, nanoparticles, etc. Rigorous numerical solutions are progressively more accessible. Analytical contributions are usually restricted to limiting cases, but greatly facilitate the physicochemical interpretation of complex systems.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Electrochemical Analysis and Applications · Chemical and Physical Properties in Aqueous Solutions · Spectroscopy and Quantum Chemical Studies
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (69)
Show source-provided references
1. Bioavailability of trace metals to aquatic microorganisms: importance of chemical, biological and physical processes on biouptake10.1016/j.biochi.2006.09.008 ↗
2. Dynamic speciation analysis and bioavailability of metals in aquatic systems10.1021/es050404x ↗
3. Guidelines for terms related to chemical speciation and fractionation of elements. Definitions, structural aspects, and methodological approaches (IUPAC Recommendations 2000)10.1351/pac200072081453 ↗
4. When are metal complexes bioavailable?10.1071/EN15205 ↗
5. Using biotic ligand models to predict metal toxicity in mineralized systems10.1016/j.apgeochem.2014.07.005 ↗
6. Metals in the aquatic environment-interactions and implications for the speciation and bioavailability: a critical overview10.1007/s10498-014-9251-x ↗
7. Critical review perspective: elemental speciation analysis methods in environmental chemistry—moving towards methodological integration10.1071/EN09018 ↗
8. Analytical methods for determination of free metal ion concentration, labile species fraction and metal complexation capacity of environmental waters: a review10.1016/j.aca.2008.10.046 ↗
9. Electrochemical methods for speciation of trace elements in marine waters. Dynamic aspects10.1021/jp2124636 ↗
10. Adsorption of cadmium on titanium dioxide nanoparticles in freshwater conditions—a chemodynamic study10.1002/elan.201500153 ↗
11. Transfer of complexed and dissociated ionic species at soft interfaces: a voltammetric study of chemical kinetic and diffusional effects10.1039/C6CP00780E ↗
12. Studies of ion transfer across liquid membranes by electrochemical techniques10.1039/c2pc90005j ↗
13. Contribution of partially labile complexes to the DGT metal flux10.1021/es200610n ↗
14. Metal accumulation in DGT: impact of ionic strength and kinetics of dissociation of complexes in the resin domain10.1021/ac501679m ↗
15. Influence of the settling of the resin beads on diffusion gradients in thin films measurements10.1016/j.aca.2015.04.054 ↗
16. Processing nanostructured materials: the need to integrate experimental data with multiscale continuum/non-continuum simulations10.1016/S0022-0728(02)01452-3 ↗
17. Revisited: the conception of lability of metal complexes10.1002/1521-4109(200106)13:10<826::AID-ELAN826>3.0.CO;2-J ↗
18. Key role of the resin layer thickness in the lability of complexes measured by DGT10.1021/es200609v ↗
19. Kinetic mixture effects in diffusion gradients in thin films (DGT)10.1039/c3cp51038g ↗
20. Impact of ligand protonation on eigen-type metal complexation kinetics in aqueous systems10.1021/jp0673009 ↗
21. Buffle · 1988
22. Complexation isotherms in metal speciation studies at trace concentration levels. Voltammetric techniques in environmental samples10.1039/b201345m ↗
23. Speciation of trace metals in natural waters: the influence of an adsorbed layer of natural organic matter (NOM) on voltammetric behaviour of copper10.1016/j.aca.2007.11.011 ↗
24. A comparison between the determination of free Pb(II) by two techniques: absence of gradients and Nernstian equilibrium stripping and resin titration10.1016/j.aca.2007.07.055 ↗
25. Stripping chronopotentiometry at scanned deposition potential (SSCP). Part 1. Fundamental features10.1016/S0022-0728(02)01212-3 ↗
26. Scanned stripping chronopotentiometry of metal complexes: lability diagnosis and stability computation10.1016/j.jelechem.2004.03.016 ↗
27. Stripping chronopotentiometry in environmental analysis10.1002/elan.200703956 ↗
28. Addressing temperature effects on metal chemodynamics studies using stripping electroanalytical techniques. Part 1: lability of small complexes10.1016/j.jelechem.2015.06.010 ↗
29. Effects of adsorption in stripping chronopotentiometric metal speciation analysis10.1016/S0022-0728(02)00747-7 ↗
30. Stripping chronopotentiometry at scanned deposition potential (SSCP). Part 4. The kinetic current regime10.1016/j.jelechem.2003.07.002 ↗
31. Voltammetric lability of metal complexes at spherical microelectrodes with various radii10.1016/S0022-0728(01)00475-2 ↗
32. Interpretation of diffusion gradients in thin films (DGT) measurements: a systematic approach10.1071/EN14068 ↗
33. Lability of complexes in steady state finite planar diffusion10.1016/j.jelechem.2006.01.005 ↗
34. Fundamental equation for the electrolytic current when depending on the formation rate of the depolariser jointly with diffusion and its polarographic verification10.1135/cccc19470337 ↗
35. Lability and mobility effects on mixtures of ligands under steady-state conditions10.1039/b306172h ↗
36. Ligand mixture effects in metal complex lability10.1021/jp0707844 ↗
37. Lability criteria for successive metal complexes in steady-state planar diffusion10.1021/jp054364v ↗
38. Stripping chronopotentiometry at scanned deposition potential (SSCP). Part 7. Kinetic currents for ML2 complexes10.1016/j.jelechem.2005.11.004 ↗
39. Experimental verification of the metal flux enhancement in a mixture of two metal complexes: the Cd/NTA/glycine and Cd/NTA/citric acid systems10.1039/B915486H ↗
40. Computing steady-state metal flux at microorganism and bioanalogical sensor interfaces in multiligand systems. A reaction layer approximation and its comparison with the rigorous solution10.1039/b700913e ↗
41. Metal flux and dynamic speciation at (bio)interfaces. Part III: MHEDYN, a general code for metal flux computation; application to simple and fulvic complexants10.1021/es071319n ↗
42. Metal flux through consuming interfaces in ligand mixtures: boundary conditions do not influence the lability and relative contributions of metal species10.1039/c1cp20705a ↗
43. Analytical theoretical approach to the transient and steady state voltammetric response of reaction mechanisms. Linear diffusion and reaction layers at micro- and submicroelectrodes of arbitrary geometry10.1016/j.jelechem.2016.09.047 ↗
44. Analytical expression of non steady-state concentration for the CE mechanism at a planar electrode10.1007/s10910-011-9968-3 ↗
45. Lability of metal complexes at spherical sensors. Dynamic voltammetric measurements10.1039/b922513g ↗
46. The reaction layer at microdiscs: a cornerstone for the analytical theoretical treatment of homogeneous chemical kinetics at non-uniformly accessible microelectrodes10.1016/j.elecom.2016.07.006 ↗
47. Analytical theoretical approach to the transient and steady state voltammetric response of reaction mechanisms. Linear diffusion and reaction layers at micro- and submicroelectrodes of arbitrary geometry10.1016/j.jelechem.2016.09.047 ↗
48. Reverse pulse voltammetry at spherical and disc microelectrodes: characterization of homogeneous chemical equilibria and their impact on the species diffusivities10.1016/j.electacta.2015.03.199 ↗
49. Voltammetric speciation studies of systems where the species diffusivities differ significantly10.1007/s10008-014-2620-y ↗
50. Interfacial metal flux in ligand mixtures. 3. Unexpected flux enhancement due to kinetic interplay at the consuming surface, computed for aquatic systems10.1021/es9003526 ↗
51. Metal flux and dynamic speciation at (bio)interfaces. Part V: the roles of simple, fulvic and aggregate complexes on Pb flux in freshwater ligand mixtures, computed at planar consuming interfaces10.1016/j.gca.2008.11.025 ↗
52. Metal flux and dynamic speciation at (Bio)interfaces. Part 1: critical evaluation and compilation of physicochemical parameters for complexes with simple ligands and fulvic/humic substances10.1021/es070702p ↗
53. Metal flux and dynamic speciation at (Bio) interfaces. Part II: evaluation and compilation of physicochemical parameters for complexes with particles and aggregates10.1021/es071117r ↗
54. FLUXY: a simple code for computing steady-state metal fluxes at consuming (bio) interfaces, in natural waters10.1071/EN07095 ↗
55. Metal flux and dynamic speciation at (bio)interfaces. Part VI: the roles of simple, fulvic and aggregate complexes on computed metal flux in freshwater ligand mixtures; comparison of Pb, Zn and Ni at planar and microspherical interfaces10.1016/j.gca.2008.11.026 ↗
56. Voltammetric analysis of heterogeneity in metal ion binding by humics10.1021/es000111y ↗
57. Voltammetry of heterogeneous labile metal–macromolecular systems for any ligand-to-metal ratio. Part I. Approximate voltammetric expressions for the limiting current to obtain complexation information10.1016/S0022-0728(00)00040-1 ↗
58. Voltammetry of heterogeneous labile metal–macromolecular systems for any ligand-to-metal ratio—Part II. Obtaining the binding curve from the normalised limiting currents10.1016/S0022-0728(01)00618-0 ↗
59. Voltammetry of heterogeneous labile metal–macromolecular systems for any ligand-to-metal ratio. Part III. Rigorous computation of the binding curve from the normalised limiting currents10.1016/S0022-0728(02)00999-3 ↗
60. Electrochemical metal speciation analysis of chemically heterogeneous samples: the outstanding features of stripping chronopotentiometry at scanned deposition potential10.1021/es030033p ↗
61. Voltammetry of heterogeneous labile metal–macromolecular systems for any ligand to metal ratio: part IV. Binding curve from the polarographic waves10.1016/j.jelechem.2004.12.008 ↗
62. Interfacial metal flux in ligand mixtures. 1. The revisited reaction layer approximation: theory and examples of applications10.1021/jp811429e ↗
63. Chemodynamics of soft nanoparticulate complexes: Cu(II) and Ni(II) complexes with fulvic acids and aquatic humic acids10.1021/es3018013 ↗
64. Chemodynamics of soft charged nanoparticles in aquatic media: fundamental concepts10.1021/jp4044368 ↗
65. Labilities of aqueous nanoparticulate metal complexes in environmental speciation analysis10.1071/EN13138 ↗
66. Kinetics of heavy metal dissociation from natural organic matter: roles of the carboxylic and phenolic sites10.1021/acs.est.6b01809 ↗
67. Rates of ionic reactions with charged nanoparticles in aqueous media10.1021/jp209488v ↗
68. Impact of electrostatics on the chemodynamics of highly charged metal–polymer nanoparticle complexes10.1021/la403106m ↗
69. Speciation dynamics of metals in dispersion of nanoparticles with discrete distribution of charged binding sites10.1039/C3CP54659D ↗