Screen-printed sensor for batch and flow injection potentiometric chromium(VI) monitoring

AbstractA disposable screen-printed electrode was designed and evaluated for direct detection of chromium(VI) in batch and flow analysis. The carbon screen-printed electrode was modified with a graphite–epoxy composite. The optimal graphite–epoxy matrix contains 37.5% graphite powder, 12.5% diphenylcarbohydrazide, a selective compound for chromium(VI), and 50% epoxy resin. The principal analytical parameters of the potentiometric response in batch and flow analysis were optimized and calculated. The screen-printed sensor exhibits a response time of 20 ± 1 s. In flow analysis, the analytical frequency of sampling is 70 injections per hour using 0.1 M NaNO3 solution at pH 3 as the carrier, a flow rate of 2.5 mL·min−1, and an injection sample volume of 0.50 mL. The sensor shows potentiometric responses that are very selective for chromium(VI) ions and optimal detection limits in both static mode (2.1 × 10−7 M) and online analysis (9.4 × 10−7 M). The disposable potentiometric sensor was employed to determine toxicity levels of chromium(VI) in mineral, tap, and river waters by flow-injection potentiometry and batch potentiometry. Chromium(VI) determination was also carried out with successful results in leachates from municipal solid waste landfills. FigureSchematic diagram of the flow system and potentiometric response peaks to chromium (VI) of the screen-printed sensor

[1]  Lukasz Tymecki,et al.  Miniaturized, Planar Ion-selective Electrodes Fabricated by Means of Thick-film Technology , 2006, Sensors (Basel, Switzerland).

[2]  S. Moon,et al.  Potentiometric Cr(VI) selective electrode based on novel ionophore-immobilized PVC membranes. , 2005, Talanta.

[3]  M. A. Alonso-Lomillo,et al.  Recent developments in the field of screen-printed electrodes and their related applications. , 2007, Talanta.

[4]  Jae Ho Shin,et al.  Solvent-Processible Polymer Membrane-Based Liquid Junction-Free Reference Electrode , 1998 .

[5]  John P. Hart,et al.  Screen-printed electrochemical sensors for monitoring metal pollutants , 2003 .

[6]  B. Yosypchuk,et al.  Nontraditional Electrode Materials in Environmental Analysis of Biologically Active Organic Compounds , 2007 .

[7]  K. Brainina,et al.  Modified carbon-containing electrodes in stripping voltammetry of metals. Part II. Composite and microelectrodes , 2008 .

[8]  J. Barek,et al.  Analytical Applications of Composite Solid Electrodes , 2009 .

[9]  M. J. Gismera,et al.  Copper(II) Ion-Selective Electrodes Based on Dithiosalicylic and Thiosalicylic Acids , 2003 .

[10]  A. Stein,et al.  Ion-selective electrodes with three-dimensionally ordered macroporous carbon as the solid contact. , 2007, Analytical chemistry.

[11]  E. Kılıç,et al.  Construction of an anion-selective electrode: Dichromate-selective electrode , 2007 .

[12]  G. Mohamed,et al.  Disposal screen-printed carbon paste electrodes for the potentiometric titration of surfactants , 2008 .

[13]  G. Shi,et al.  A water-soluble cationic oligopyrene derivative : Spectroscopic studies and sensing applications , 2009 .

[14]  E. M. Pinto,et al.  Development and characterization of a new conducting carbon composite electrode. , 2009, Analytica chimica acta.

[15]  Z. Marczenko.  Spectrophotometric determination of elements , 1976 .

[16]  G. Moustafa,et al.  Hydrogen chromate PVC matrix membrane sensor for potentiometric determination of chromium(III) and chromium(VI) ions. , 1996, Talanta.

[17]  A Study on Hexachromic Ion Selective Electrode Based on Supported Liquid Membranes , 2001, Environmental monitoring and assessment.

[18]  Potentiometric carbon paste sensors for lead(II) based on dithiodibenzoic and mercaptobenzoic acids. , 2006, Analytical sciences : the international journal of the Japan Society for Analytical Chemistry.

[19]  J. Barek,et al.  Differential Pulse Voltammetric Determination of Selected Nitro-Compounds on Silver, Solid Silver Composite, and Solid Graphite Composite Electrodes , 2009 .

[20]  E. Vansant,et al.  Characteristics of new composite- and classical potentiometric sensors for the determination of pharmaceutical drugs , 2006 .

[21]  I. Villaescusa,et al.  Vegetable waste-based sensors for metal ion determination , 2007 .

[22]  A. Ivaska,et al.  Potentiometric ion sensors. , 2008, Chemical reviews.

[23]  M. El-Shahawi,et al.  A Potentiometric Rhodamine-B Based Membrane Sensor for the Selective Determination of Chromium Ions in Wastewater , 2005, Analytical sciences : the international journal of the Japan Society for Analytical Chemistry.

[24]  E. Pretsch.  The new wave of ion-selective electrodes , 2007 .

[25]  Inamuddin,et al.  Organic-inorganic Composite Cation-exchanger: Poly-o-toluidine Zr(IV) Phosphate-based Ion-selective Membrane Electrode for the Potentiometric Determination of Mercury , 2008, Analytical sciences : the international journal of the Japan Society for Analytical Chemistry.

[26]  Richard P. Buck,et al.  Recommendations for nomenclature of ionselective electrodes (IUPAC Recommendations 1994) , 1994 .

[27]  Inamuddin,et al.  Studies on the Preparation and Analytical Applications of Various Metal Ion-Selective Membrane Electrodes Based on Polymeric, Inorganic and Composite Materials—A Review , 2008 .

[28]  Jiří Koryta.  ION-Selective Electrodes , 1986 .

[29]  M. J. Gismera,et al.  Ion-selective carbon paste electrode based on tetraethyl thiuram disulfide for copper(II) and mercury(II) , 2004 .

[30]  L. Singh,et al.  A solid membrane sensor for chromate ions , 1995 .

[31]  Artur Dybko,et al.  All-solid-state miniaturised planar reference electrodes based on ionic liquids , 2006 .

[32]  J. M. Bhatnagar,et al.  Selective anion recognition: Charged diaza crown ethers based electrochemical sensors for chromate ions , 2005 .

[33]  S. Moon,et al.  Determination of Cr(VI) using an Ion Selective Electrode with SLMs containing Aliquat336 , 2004, Environmental monitoring and assessment.

[34]  P. Bühlmann,et al.  Selectivity of potentiometric ion sensors. , 2000, Analytical chemistry.