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Cu(II)-3-(5-chlor-2-hydroxy-3-sulfophenylazo)-6-(2,4,6-tribromophenylazo)-4,5-dihydroxynaphthalene-2,7-disulfonic acid-co(II) binuclear complexation and its application to the selective determination of coblat at ng/ml level
journal contributionposted on 2023-05-26, 05:33 authored by HW Gao, Xuequan Lu, JR Ren
The chromophore, 3-(5-chlor-2-hydroxy-3-sulfophenylazo)-6-(2,4,6-tribromophenylazo)-4,5-dihydroxynaphthalene-2,7-disulfonic acid (CSTDD) was used to complex Cu(II) and Co(II) in aqueous solution at pH 9.43. A binuclear complex of Cu-CSTDD-Co was formed and showed a high selectivity for the determination of Co(II). The spectral correction technique was applied to characterize the complexes. The results showed the formation of complexes of Cu(CSTDD), Co(CSTDD)3 and Cu2(CSTDD)2Co. The quantitative analysis of Co(II) at ng/ml level was carried out by the light-absorption ratio variation approach (LARVA). The results showed that the technique is satisfactory to determine Co(II) at trace level in water samples with a detection limit of 2.3 ng/ml.
PublisherJAPAN SOC ANALYTICAL CHEMISTRY
Science & TechnologyPhysical SciencesChemistry, AnalyticalChemistrySPECTROPHOTOMETRIC DETERMINATIONCOBALTNICKELREAGENTCO(II)COPPERDNACalibrationCobaltColoring AgentsHydrogen-Ion ConcentrationMolecular StructureNaphthalenesulfonatesOrganometallic CompoundsWater SupplyChemical Sciences not elsewhere classifiedAnalytical Chemistry not elsewhere classified