In situ voltammetric measurements in natural waters: Future prospects and challenges

Tercier, M.-L.; Buffle, Jacques

doi:10.1002/elan.1140050303

Cited by 105 publications

(45 citation statements)

References 114 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Among the methods available for this purpose are the direct methods, viz. voltammetry, particularly using microelectrodes, and separation coupled or not to preconcentration methods such as equilibrium dialysis, ultrafiltration, solvent extraction with their advantages and disadvantages [1,[5][6][7]. Of these methods, voltammetric techniques using microelectrodes are most powerful allowing not only direct measurement in the laboratory but also in situ [8] and field measurements [7].…”

Section: Introductionmentioning

confidence: 99%

On-Line Coupling of Flow Through Voltammetric Microcell to Hollow Fiber Permeation Liquid Membrane Device for Subnanomolar Trace Metal Speciation Measurements

et al. 2001

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

On-Line Coupling of Flow Through Voltammetric Microcell to Hollow Fiber Permeation Liquid Membrane Device for Subnanomolar Trace Metal Speciation Measurements

et al. 2001

View full text Add to dashboard Cite

“…Distribution in Aquatic Systems [9][10][11][12][13][14][15][16][39][40][41] In brief, there are four fundamental forms of metal species: (1) free metal ions, (2) hydrated metal ions, (3) metal complexes with inorganic and/or organic ligands, and finally (4) metal species adsorbed/entrapped onto solids or colloidal particles. The early methods for assessment of such metal fractions had employed mainly voltammetric techniques, 9,10,[12][13][14][15]39 later supplemented or also altered by stripping (chrono)potentiometry.…”

Section: Speciation Of Metal Forms and Their Overallmentioning

confidence: 99%

Electroanalysis and Chemical Speciation

Navrátilová

Švancara

2014

Environmental Analysis by Electrochemical Sensors and Biosensors

View full text Add to dashboard Cite

The greatest concern for speciation of the elements relates to their impact on biological systems depending on their physical and chemical form, 1,2 occurrence, behaviour, and actual circulation in the environment (see scheme in Fig. 7.1; and reference (3)), toxicological profile, 4-7 and bioactivity and bioavailability. [5][6][7] In terms of the official terminology and IUPAC recommendation, 8 speciation analysis can be defined as a tool to find and identify the individual forms for a given element and to determine their concentration level in the sample, both with a goal to define the actual distribution of the respective species.For instance, in the case of metal ions, speciation analysis classifies three basic forms: Electrochemical MeasurementsIn combination with electrochemical principles, speciation has a long tradition and at least since the last third of the twentieth century 9-15 this special area skilfully utilises the ability of electroanalysis to indicate the changes in chemical equilibrium and redox state of various substances, which allows-together with determinations of their total content-the identification and quantification of the individual forms and their actual distribution-a problematic deal for many other instrumental techniques. In this respect, specialised teams have elaborated to a remarkable extent mainly the electrochemistry of natural aquatic systems, covering for two decades the dominant part of chemical speciation in environmental electroanalysis (see, e.g., references (15, 16)).Concerning the most convenient electrochemical techniques for speciation analysis, there is (equilibrium) potentiometry and, mainly, stripping techniques with the effective pre-concentration step for accumulating many species at a high concentration level. Potentiometry with Ion-Selective Electrodes (ISEs 17 )This is the traditional technique for indication of the changes in chemical equilibrium and requires zero-current conditions. This may be advantageous with respect to the high selectivity achieved; however, common potentiometric measurements are not sufficiently sensitive to be used for monitoring at the trace concentration This technique coupled with differential-pulse or square-wave potential ramp (DPASV and SWASV) is able to detect extremely low concentration levels (down to 1 Â 10 -11 mol/L À1 ), when still distinguishing the labile and non-labile fractions of the corresponding metal(s). Electrochemical deposition within the stripping procedure enables to accumulate onto the electrode the labile forms of metal(s) under controlled-usually, constant-potential, when the effectiveness of such depositions is strongly dependent upon the type of electrode and the composition of supporting/background electrolytes (type of major components, pH, ionic strength, the presence of complex-forming anions or other ligands). Stripping (Chrono)potentiometryStripping (chrono)potentiometry in its two common variants, potentiometric stripping analysis (with chemical oxidation, PSA 21,23 ) and constant current stripp...

show abstract

“…Design of appropriate probes is still a challenging task. Amongst the analytical tools available, the potentiality of voltammetric techniques for trace compounds analysis in natural waters has been demonstrated for many years in the literature [5][6][7][8][9]. Apart from being highly sensitive, they allow simultaneous determinations of several elements.…”

Section: Introductionmentioning

confidence: 99%

A Novel Voltammetric In-Situ Profiling System for ContinuousReal-Time Monitoring of Trace Elements in Natural Waters

Tercier¹,

Buffle

Graziottin

1998

Electroanalysis

View full text Add to dashboard Cite

This article describes a novel voltammetric in-situ profiling system (VIP System) for continuous, real-time monitoring of trace elements in fresh and seawater down to 500 meter depth. The VIP System has been designed using advanced microprocessor and telemetry technology. The heart of the submersible voltammetric probe is a Hg-plated Ir-based microsensor covered with an antifouling gel membrane. This gel integrated microsensor allows direct voltammetric measurements of trace metals in complex media without physical and chemical interferences of the test solution. A detailed description of the system is given and examples of environmental applications are reported for in-situ trace metal monitoring in oxygen saturated seawater as well as for in-situ profiling of Mn II in anoxic lake water. The results indicate that the VIP System is robust and reliable and that in-situ measurements of mobile fraction of trace metals can be achieved down to very low concentration levels (ca. 5 ppt).

show abstract

In situ voltammetric measurements in natural waters: Future prospects and challenges

Cited by 105 publications

References 114 publications

On-Line Coupling of Flow Through Voltammetric Microcell to Hollow Fiber Permeation Liquid Membrane Device for Subnanomolar Trace Metal Speciation Measurements

On-Line Coupling of Flow Through Voltammetric Microcell to Hollow Fiber Permeation Liquid Membrane Device for Subnanomolar Trace Metal Speciation Measurements

Electroanalysis and Chemical Speciation

A Novel Voltammetric In-Situ Profiling System for ContinuousReal-Time Monitoring of Trace Elements in Natural Waters

Contact Info

Product

Resources

About