Photoelectrochemical detector for high-performance liquid chromatography and flow injection analysis

LaCourse, William R.; Krull, Ira S.; Bratin, Karl

doi:10.1021/ac00286a006

Cited by 33 publications

(18 citation statements)

References 8 publications

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“…Oxygen reacts with the photochemically generated radicals which, for the ethanol species, are produced according to BQ + hv -BQ'(S) (8) BQ' (3 -BQ' (TI (9) BQ*(TI + CH~CH,OH + BQH-+ CH,~HOH (10) where (S) and (T) denote the singlet and triplet states respFctively, BQH' is the semiquinone radical and CH,CHOH the a-hydroxyalkyl radical. Under anaerobic conditions the two radical intermediates disproportionate and produce the oxidized form of the analyte and the reduced form of the quinone:…”

Section: Result9 and Discussionmentioning

confidence: 99%

Photoelectrochemical detection of alcohols

Barisci

Wallace

1992

Electroanalysis

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A method for photoelectrochemical detection of alcohols in liquid chromatography and flow injection analysis based on the reaction of the analyte with a photosensitized quinone (benzoquinone) has been developed. Irradiation of the flowing solution and electrochemical detection of the generated photoproduct is carried out within the detector flow cell. Pulsed amperometric detection produced higher sensitivities than conventional potentiostatic amperometry. Samples of vodka and beer were successfully analyzed using the proposed method.

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Section: Result9 and Discussionmentioning

confidence: 99%

Photoelectrochemical detection of alcohols

Barisci

Wallace

1992

Electroanalysis

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“…Where possible, a critical comparison will be made between them and alternative analytical methods based primarily on chromatographic and spectroscopic techniques. benzidine determined in urine 67 in presence of acetylated metabolites 25) for the determination of carbonyl compounds. A flow-through, thin layer amperometric cell was modified to irradiate the working electrode surface and so take advantage of new and/or altered electrochemical properties of photogenerated excited states, intermediates or products.…”

Section: (B) Stripping Voltammetrymentioning

confidence: 99%

Electrochemical analysis of organic pollutants

Smyth¹,

Smyth²

1987

Pure and Applied Chemistry

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“…In photoelectrochemistry [37] photons participate directly in an electrode process via the electronic excitation of electroactive species in solution. As yet surprisingly limited use has been made of this methodology for electroanalysis [38][39][40][41][42][43]. However, light can be used not only to excite electroactive species in solution but also to activate the electrode surface itself.…”

Section: Introductionmentioning

confidence: 99%

A Comparison Between Pulsed Sonovoltammetry and Low Power Laser Activated Voltammetry for the Electroanalysis of Ascorbic Acid in a Commercial Fruit Drink

Akkermans

Compton

1998

Electroanalysis

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A comparison is made between two 'dual activation' electroanalytical techniques for the detection and measurement of vitamin C (L-ascorbic acid) in a commercially available fruit drink via its two electron oxidation at platinum electrodes. Glucose is found not to interfere with the analytical response. First in sonovoltammetry pulses of 25 Wcm ¹2 are applied and the current response characterized in the 'pulse off' period where a current plateau is attained. Second in laser activated voltammetry a 10 Hz pulsed laser (532 nm, ca. 240 Wcm ¹2 average intensity) is used to 'burn' surface adsorbed passivating species off the electrode. Both methods cause agitation of the solution in the bulk phase or at the electrode-solution interface and lead to regular renewal of the diffusion layer. The mass transport limited oxidation currents so obtained are found to scale with ascorbic acid concentration in media where electroanalysis without simultaneous ultrasonic or laser stimulation may be precluded due to electrode passivation. Application to the quantitative electroanalysis of ascorbic acid in the fruit drinks Ribena and 'No added sugar' Ribena is reported. The results obtained are in excellent agreement with those yielded by independent chemical and electrochemical methods.

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Photoelectrochemical detector for high-performance liquid chromatography and flow injection analysis

Cited by 33 publications

References 8 publications

Photoelectrochemical detection of alcohols

Photoelectrochemical detection of alcohols

Electrochemical analysis of organic pollutants

A Comparison Between Pulsed Sonovoltammetry and Low Power Laser Activated Voltammetry for the Electroanalysis of Ascorbic Acid in a Commercial Fruit Drink

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