Comparison of spectrophotometric and potentiometric detection for the determination of water using Karl Fischer method under flow injection analysis conditions

Dantan, Nathalie; Kröning, Steffen; Frenzel, Wolfgang; Küppers, Stephan

doi:10.1016/s0003-2670(00)00980-6

Cited by 8 publications

(6 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We conclude that the total surface coverage and electroactivity is the same (water, water/50% CH 3 CN vs. C 2 H 4 Cl 2 ) and either the film electron transfer kinetics are slower or simply the increased solution resistivity and junction potentials shift the voltammograms [52]. This is in sharp contrast to early studies on (TEA) 3 Fe(CN) 6 in organic solvents where large shifts in E 1/2 were observed for various percentages of water in the solvent [53]. From anhydrous C 2 H 4 Cl 2 , the addition of trace water (from 0.002% to 0.12%, Figure 2B -E) causes both the anodic and cathodic peak currents to increase substantially and DE p to decrease.…”

Section: Voltammetry In Organic Solventsmentioning

confidence: 85%

“…In Figure 4 are plots of charge as function of the percentage of trace water for one electrode in four different halogenated solvents. Considering response time, sensitivity and linear range for all four solvents, we found that depositing 1.9 mC/cm 2 of the ionomer film is optimal for CHCl 3 solvent, the conductivity of the film should be dependent on trace water. Thus, we assembled two closely-spaced Au electrodes and deposited PAH-Fe(CN) 6 4À with sufficient surface coverage to span the insulating ca.…”

Section: Voltammetry In Organic Solventsmentioning

confidence: 97%

See 1 more Smart Citation

Polyallylammonium Ferrocyanide Films for Trace Water Detection in Halogenated Solvents

2009

View full text Add to dashboard Cite

Polyallylammonium films with electrostatically bound ferrocyanide were formed by electrochemically reducing ferricyanide ions in the presence of polyallylammonium chloride. These films could be deposited onto the surfaces of Pt, Au or SnO 2 electrodes. In anhydrous organic electrolyte solutions, these films are electroinactive but become electroactive after the addition of trace water. For concentrations of water from 0.0 to 0.12% in chlorinated solvents, the electroactivity is linear with water concentration. The linearity between concentration of water and electroactivity can be exploited to develop a subsaturation trace water sensor.

show abstract

Section: Voltammetry In Organic Solventsmentioning

confidence: 85%

Section: Voltammetry In Organic Solventsmentioning

confidence: 97%

Polyallylammonium Ferrocyanide Films for Trace Water Detection in Halogenated Solvents

2009

View full text Add to dashboard Cite

show abstract

“…Indirect determination of epinephrine in pharmaceutical products in the SIA system was based on oxidation with periodate and determination of IO 4 − ion with PVC-based ISE with a solid contact [49]. The FIA system with direct potentiometry using platinum tube electrodes in a differential mode was developed for determination of water using a pyridine-free Karl Fischer reagent [60].…”

Section: Potentiometric Detection In Flow Analysismentioning

confidence: 99%

Recent developments in electrochemical flow detections—A review

Trojanowicz

2009

Analytica Chimica Acta

129

View full text Add to dashboard Cite

“…A super ionic conductor NASICON was employed as membrane material for a sodium ISE and amperometric sensor in FIA conditions [26]. A tubular differential potentiometric flow cell employing a Pt tubular electrode was employed for FIA determination of water in methanol [27]. Continuous-flow system based on null-point potentiometry with nitrate PVC based ISE was developed for trace nitrate determination in rain water [28].…”

Section: Flow Analysis With Potentiometric Detectionmentioning

confidence: 99%

Electroanalytical Flow Measurements–Recent Advances

2003

View full text Add to dashboard Cite

As general trends in current development of chemical analysis, including electroanalysis, one can indicate a search for methods fast and multianalyte, for miniaturized measuring devices, mechanization and automation of analytical processes. In all these trends a significant role is played by measurements in flow conditions. The major advantage of flow electroanalysis is a possibility of utilizing a kinetic discrimination in potentiometric measurements and enhancement of mass transport in voltammetric techniques. Flow injection techniques provide shortening of time of a single analytical determination due to reproducible use of transient signal from the detector without need of obtaining a steady-state equilibrium signal. Electrochemical detection in HPLC gives often improved selectivity and detection limit for electroactive solutes, whereas in capillary electrophoresis it allows a convenient design of portable, integrated chips for field application. This review presents state-of-the -art of flow electroanalysis based on 226 cited literature references

show abstract

Comparison of spectrophotometric and potentiometric detection for the determination of water using Karl Fischer method under flow injection analysis conditions

Cited by 8 publications

References 17 publications

Polyallylammonium Ferrocyanide Films for Trace Water Detection in Halogenated Solvents

Polyallylammonium Ferrocyanide Films for Trace Water Detection in Halogenated Solvents

Recent developments in electrochemical flow detections—A review

Electroanalytical Flow Measurements–Recent Advances

Contact Info

Product

Resources

About