An electrochemical scrubber for the elimination of eluent background effects in polarographic flow-through detection

Hanekamp, H.B.; Voogt, W.H.; Bos, P.K.; Frei, R.W.

doi:10.1016/s0003-2670(01)93716-x

Cited by 72 publications

(27 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Since oxygen reduction occurs at a more positive potential than nitrate reduction, the large current from the oxygen reduction interferes with the nitrate measurement. A Interference from dissolved oxygen can be removed by purging with an inert gas, electrolysis, 37 photochemical processing, 38 and permeation through a semi-permeable membrane. 39 However, these methods are unsuitable for field-deployable sensors because they require complex additional fabrication and/or toxic chemicals.…”

Section: Cyclic Voltammetrymentioning

confidence: 99%

Chronocoulometric determination of nitrate on silver electrode and sodium hydroxide electrolyte

Kim

Goldberg

Judy

2007

Analyst

View full text Add to dashboard Cite

An electrochemical system that consists of a silver electrode in 0.01 M sodium hydroxide electrolyte was investigated in an effort to develop a sensitive in situ analytical method for nitrate. Cyclic voltammetry demonstrated that the proposed system has a high normalized sensitivity (2.47 A s(1/2) V(-1/2) M(-1) cm(-2)), compared to more complex electroanalytical schemes. Double-potential-step chronocoulometry was used to maximize the signal-to-noise ratio (SNR), and minimize interference from dissolved oxygen in the electrolyte. The integration period for double-potential-step chronocoulometry was determined by optimizing the extended Cottrell equation. The integrated current is proportional to nitrate up to 10 mM and the average detection limit is approximately 1.7 microM. Dissolved oxygen does not degrade performance. To examine the potential interference of other ions when analyzing nitrate, we measured the electrode response to 1000 microM each of NO(2-), Cl(-), PO(4)(3-), SO(4)(2-), F(-), CO(3)(2-), BO(2-), K(+), Ca(2+), and Sr(2+) with and without 1000 microM nitrate. Interference is negligible for most of the ions when nitrate is absent (i.e. <1% of the response to equimolar nitrate). However, interference is substantial (>20% increase or decrease in the electrode response to nitrate) for PO(4)(3-), Ca(2+), and Sr(2+) when equimolar nitrate is present.

show abstract

Section: Cyclic Voltammetrymentioning

confidence: 99%

Chronocoulometric determination of nitrate on silver electrode and sodium hydroxide electrolyte

Kim

Goldberg

Judy

2007

Analyst

View full text Add to dashboard Cite

show abstract

“…Generally, methods for oxygen elimination can be sub-divided into four categories, (i) namely physical (purging the solution with nitrogen/argon flow in the solution), (ii) chemical (by adding oxygen reducing agent such as ascorbic acid [22] or sodium thiosulfate [23]), (iii) enzymatic (using glucose as oxygen scavenger in the presence of an enzyme to reduce oxygen molecules [24]), and (iv) electrochemical [25,26]. The latter can have some significant advantages, if small volumes have to be treated without introducing additional reactive species in the analyzed solution, i.e.…”

mentioning

confidence: 99%

Local removal of oxygen for NAD(P)+ detection in aerated solutions

Etienne

Lapicque

et al. 2020

Electrochimica Acta

View full text Add to dashboard Cite

The mediated electrochemical reduction of NAD(P) + in aerated solution was investigated and exploited for NAD(P)H regeneration in view of biosensing application. Oxygen was locally removed from the electrode surface with an electrochemical oxygen filter made of platinum grids positioned close to the oxygen sensitive reactions. The working electrode was a bucky paper functionalized with [Cp*Rh(bpy)Cl] + by diazonium electrografting. The local oxygen removal was first evaluated, before to be applied to deoxygenation for NAD + and NADP + reduction. A porous silica gel layer encapsulating D-sorbitol dehydrogenase was finally deposited on the top of the modified bucky paper and the resulting bioelectrode was found sensitive to the presence of D-fructose.

show abstract

“…A similar approach has also been taken to improve the signal-to-noise ratio with polarographic detectors. 233 A cell containing a porous silver electrode is placed in the chromatographic system, in which traces of oxygen, metals, and reducible organic impurities are reduced. The authors report that the residual detector current decreases 100-fold and the noise tenfold in comparison with the use of a mobile phase deaerated by the passage of nitrogen alone.…”

Section: Figure 8bmentioning

confidence: 99%