Fused Silica Microcapillaries Used for a Simple Miniaturization of the Electrified Liquid-Liquid Interface

Konrad Rudnicki, Lukasz Poltorak*, Sławomira Skrzypek, Ernst J.R. Sudhölter

*Corresponding author for this work

    Research output: Contribution to journalArticleScientificpeer-review

    22 Citations (Scopus)
    65 Downloads (Pure)

    Abstract

    Short pieces of fused silica capillary tubing were used to support an electrified liquid-liquid interface. A methyl deactivated silica capillary having a diameter of 25 μm was filled with 1,2-dichloroethane solution and served as the organic part of the liquid-liquid interface. A nondeactivated fused silica capillary having a diameter of 5, 10, or 25 μm was filled with an aqueous HCl solution and served as the aqueous part of the electrochemical cell. For the latter, silanization of the capillary interior with chlorotrimethylsilane allowed for a successful phase reversal. All capillaries were characterized by ion transfer voltammetry using tetramethylammonium cation as a model ion. This simple, fast, and low-cost miniaturization technique was successfully applied for detection of the antibiotic ofloxacin.

    Original languageEnglish
    Pages (from-to)7112-7116
    Number of pages5
    JournalAnalytical Chemistry
    Volume90
    Issue number12
    DOIs
    Publication statusPublished - 21 May 2018

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