Measurement of labile copper in wine by medium exchange stripping potentiometry utilising screen printed carbon electrodes

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Abstract

The presence of copper in wine is known to impact the reductive, oxidative and colloidal stability of wine, and techniques enabling measurement of different forms of copper in wine are of particular interest in understanding these spoilage processes. Electrochemical stripping techniques developed to date require significant pretreatment of wine, potentially disturbing the copper binding equilibria. A thin mercury film on a screen printed carbon electrode was utilised in a flow system for the direct analysis of labile copper in red and white wine by constant current stripping potentiometry with medium exchange. Under the optimised conditions, including an enrichment time of 500 s and constant current of 1.0 μA, the response range was linear from 0.015 to 0.200 mg/L. The analysis of 52 red and white wines showed that this technique generally provided lower labile copper concentrations than reported for batch measurement by related techniques. Studies in a model system and in finished wines showed that the copper sulfide was not measured as labile copper, and that loss of hydrogen sulfide via volatilisation induced an increase in labile copper within the model wine system.
Original languageEnglish
Pages (from-to)431-437
Number of pages7
JournalTalanta
Volume154
DOIs
Publication statusPublished - 2016

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Potentiometry
Wine
Copper
Electrodes
Carbon
Electrochemical Techniques
Spoilage
Hydrogen Sulfide
Volatilization
Sulfides
Mercury
Vaporization

Cite this

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title = "Measurement of labile copper in wine by medium exchange stripping potentiometry utilising screen printed carbon electrodes",
abstract = "The presence of copper in wine is known to impact the reductive, oxidative and colloidal stability of wine, and techniques enabling measurement of different forms of copper in wine are of particular interest in understanding these spoilage processes. Electrochemical stripping techniques developed to date require significant pretreatment of wine, potentially disturbing the copper binding equilibria. A thin mercury film on a screen printed carbon electrode was utilised in a flow system for the direct analysis of labile copper in red and white wine by constant current stripping potentiometry with medium exchange. Under the optimised conditions, including an enrichment time of 500 s and constant current of 1.0 μA, the response range was linear from 0.015 to 0.200 mg/L. The analysis of 52 red and white wines showed that this technique generally provided lower labile copper concentrations than reported for batch measurement by related techniques. Studies in a model system and in finished wines showed that the copper sulfide was not measured as labile copper, and that loss of hydrogen sulfide via volatilisation induced an increase in labile copper within the model wine system.",
author = "Andrew Clark and Nick Kodoudakis and Celia Barril and Leigh Schmidtke and Geoffrey Scollary",
note = "Imported on 12 Apr 2017 - DigiTool details were: Journal title (773t) = Talanta. ISSNs: 1873-3573;",
year = "2016",
doi = "10.1016/j.talanta.2016.03.099",
language = "English",
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TY - JOUR

T1 - Measurement of labile copper in wine by medium exchange stripping potentiometry utilising screen printed carbon electrodes

AU - Clark, Andrew

AU - Kodoudakis, Nick

AU - Barril, Celia

AU - Schmidtke, Leigh

AU - Scollary, Geoffrey

N1 - Imported on 12 Apr 2017 - DigiTool details were: Journal title (773t) = Talanta. ISSNs: 1873-3573;

PY - 2016

Y1 - 2016

N2 - The presence of copper in wine is known to impact the reductive, oxidative and colloidal stability of wine, and techniques enabling measurement of different forms of copper in wine are of particular interest in understanding these spoilage processes. Electrochemical stripping techniques developed to date require significant pretreatment of wine, potentially disturbing the copper binding equilibria. A thin mercury film on a screen printed carbon electrode was utilised in a flow system for the direct analysis of labile copper in red and white wine by constant current stripping potentiometry with medium exchange. Under the optimised conditions, including an enrichment time of 500 s and constant current of 1.0 μA, the response range was linear from 0.015 to 0.200 mg/L. The analysis of 52 red and white wines showed that this technique generally provided lower labile copper concentrations than reported for batch measurement by related techniques. Studies in a model system and in finished wines showed that the copper sulfide was not measured as labile copper, and that loss of hydrogen sulfide via volatilisation induced an increase in labile copper within the model wine system.

AB - The presence of copper in wine is known to impact the reductive, oxidative and colloidal stability of wine, and techniques enabling measurement of different forms of copper in wine are of particular interest in understanding these spoilage processes. Electrochemical stripping techniques developed to date require significant pretreatment of wine, potentially disturbing the copper binding equilibria. A thin mercury film on a screen printed carbon electrode was utilised in a flow system for the direct analysis of labile copper in red and white wine by constant current stripping potentiometry with medium exchange. Under the optimised conditions, including an enrichment time of 500 s and constant current of 1.0 μA, the response range was linear from 0.015 to 0.200 mg/L. The analysis of 52 red and white wines showed that this technique generally provided lower labile copper concentrations than reported for batch measurement by related techniques. Studies in a model system and in finished wines showed that the copper sulfide was not measured as labile copper, and that loss of hydrogen sulfide via volatilisation induced an increase in labile copper within the model wine system.

U2 - 10.1016/j.talanta.2016.03.099

DO - 10.1016/j.talanta.2016.03.099

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EP - 437

JO - Talanta

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SN - 0039-9140

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