title: A new method for application of the water-soluble dye SPADNS in a carbon paste electrode for determination of trace amounts of copper.
abstract: 2-(P-sulfophenylazo)-1,8-dihydroxy-3,6-naphthalene disulfate (SPADNS) was adsorbed on surfactant modified zeolite type A by electrostatic interaction in the aqueous phase. The dye was strongly retained and not easily leached from the surfactant-modified zeolite matrix. This compound was incorporated into a carbon paste electrode for anodic stripping voltammetric determination of trace amounts of copper. The calibration plot was linear over the copper concentration range 2.0-800 microg/L. The detection limit was found to be 0.4 microg/L Cu(II), and for 5 successive determinations of 50 and 150 microg/L Cu(II) the relative standard deviations were 1.6 and 1.2%, respectively. The modified electrode prepared in this study could be used for the determination of Cu(II) in water samples and human hair with good results.
authors.affiliation: Shahid Bahonar University of Kerman, Department of Chemistry, PO Box 76175-133, Kerman, Iran. th_rohani@yahoo.com
authors.forename: Tahereh
authors.initials: T
authors.lastname: Rohani
authors.forename: Mohammad Alu
authors.initials: MA
authors.lastname: Taher
mesh_terms: D001152:Arsenicals / Q000737:chemistry*; D001391:Azo Compounds / Q000737:chemistry*; D002138:Calibration; D002244:Carbon / Q000737:chemistry; D004396:Coloring Agents / Q000737:chemistry*; D003300:Copper / Q000032:analysis*; D004563:Electrochemistry; D004566:Electrodes; D006197:Hair / Q000737:chemistry; D006801:Humans; D007202:Indicators and Reagents; D013058:Mass Spectrometry; D012996:Solutions; D014881:Water Supply / Q000032:analysis
chemical_list: C534149:3-(2,6-dibromo-4-sulfophenylazo)-6-(2-arsenophenylazo)-4,5-dihydroxynaphthalene-2,7-disulfonic acid; D001152:Arsenicals; D001391:Azo Compounds; D004396:Coloring Agents; D007202:Indicators and Reagents; D012996:Solutions; D002244:Carbon; D003300:Copper