Amperometric carbon fiber nitrite microsensor for in situ biofilm monitoring

    Authors

    W. H. Lee; D. G. Wahman;J. G. Pressman

    Comments

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    Abbreviated Journal Title

    Public Perform. Manag. Rev.

    Keywords

    Biofilm; Carbon fiber; In situ monitoring; Microsensor; Nitrification; Nitrite; ELECTROCHEMICAL DETERMINATION; NITRIFYING BIOFILMS; ELECTRODE; MICROELECTRODE; OXIDATION; NITRATE; SURFACE; ION; VOLTAMMETRY; REDUCTION; Chemistry, Analytical; Electrochemistry; Instruments & Instrumentation

    Abstract

    A highly selective needle type solid state amperometric nitrite microsensor based on direct nitrite oxidation on carbon fiber was developed using a simplified fabrication method. The microsensor's tip diameter was approximately 7 mu m (14 mu m spatial resolution). At an applied potential of +1.2 V vs. Ag/AgCl, the microsensor exhibited a linear nitrite response from 0 to 25 mg N L-1, a 0.02 mg N L-1(1.3 mu M) limit of detection, and a fast response ( < 5 s). There was minimal interference with less than 3% of electrode response changes from major chemicals of interest in drinking water and wastewater systems [oxygen, ammonium, monochloramine, nitrate, sodium bicarbonate (alkalinity), chloride, sulfate, and acetate]. Hydrogen ion (pH) affected nitrite measurement by shifting the baseline response, translating into an approximate change of 0.24 mg N L-1 nitrite per 1 pH unit change. Depending on the conditions (e. g., pH, alkalinity, nitrite concentration), pH may need to be taken into account during nitrite measurement. The developed carbon fiber nitrite microsensor successfully measured nitrite in a nitrifying biofilm and is applicable for in situ analysis in other micro-environments (e. g., microbial mats and sediments). Published by Elsevier B.V.

    Journal Title

    Sensors and Actuators B-Chemical

    Volume

    Sens. Actuator B-Chem.

    Publication Date

    1-1-2013

    Document Type

    Article

    Language

    English

    First Page

    1263

    Last Page

    1269

    WOS Identifier

    188

    ISSN

    0925-4005

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