Extraction voltammetric determination of phosphorus

Electroregenerable anion-exchange resin with triiodide carbon paste electrode for the voltammetric determination of adrenaline

“…Several papers have described carbon paste electrodes modified with ion exchangers. [8][9][10][11][12][13][14][15][16][17][18] Nevertheless, the main goal of those works was to accumulate, preconcentrate and determine metallic cations in different environments. Gao et al 8 described a modified carbon paste electrode to determine Co(II) with a cation-exchanger and 1-10-phenathroline, achieving a detection limit of 8 3 10 28 mol l 21 after 3 min of preconcentration time.…”

“…The nitrate exerts a catalytic effect on the reduction and reoxidation of thallium in cyclic and differential-pulse voltammetry, leading to a peak enhancement, hence NO 3 2 can be determined indirectly in the redox process of Tl(0) to Tl(I). Helms and Scholz 12 built a reactive electrode with a graphite solid ion exchanger and paraffin to determine Cd 2+ , Cu 2+ , Pb 2+ and Hg 2+ in aqueous samples, achieving detection limits of 10 27 mol l 21 , after 20 h of accumulation. In more recent work, Nistor and co-workers 13 improved the stability and selectivity of a tyrosinase biosensor immobilized in Eastman AQ, a polyester-sulfonic acid cation exchanger, to determine phenolic compounds, maintaining 80% of its initial activity after 42 d.…”

Determination of Mercury at a Dithizone-Modified Glassy Carbon Electrode by Anodic Stripping Voltammetry

“…CMEs have been widely used in analytical chemistry, especially in electroanalytical chemistry, and have been successfully used to determine trace levels of heavy metal. [1][2][3][4][5] Until now, various CMEs for determining mercury have been reported. Gao and his coworkers 6 determined mercury using a ferrocenylpolythia crown ether-Nafion modifeid GCE.…”

Simultaneous Determination of Cd2+ and Pb2+ Using a Chemically Modified Electrode

“…CMEs have the following advantages: easy and convenient fabrication, enhancing sensitivity, excellent selectivity and lowcost, and they are widely used in analytical chemistry already. 5,6 In recent years, determinations of Cd 2+ or Pb 2+ by various chemically modified electrodes such as: polymeric calixarene modified carbon paste electrode, 7 carbon paste electrode containing ion changer (HYPHAN), 8 and Nafion-coated glassy carbon electrode modified by neutral ionophores, 9 have been reported. To our knowledge, the simultaneous determination of Cd 2+ and Pb 2+ using PAN CMEs has not been reported before.…”