title: Hydrodynamic chronoamperometric method for the determination of H₂O₂ using MnO₂-based carbon paste electrodes in groundwater treated by Fenton and Fenton-like reagents for natural organic matter removal.
abstract: A simple hydrodynamic chronoamperometric method based on the application of an unmodified carbon paste electrode (CPE) and bulk-modified with different contents of MnO2 was investigated for the determination of H2O2. The optimized method involving the CPE with 5% of MnO2 was applied for the determination of the H2O2 consumption in samples of groundwater from the Central Banat region (Province of Vojvodina, Serbia) treated by the Fenton (Fe(2+) and H2O2) and Fenton-like (Fe(3+) and H2O2) reagents to remove natural organic matter at different initial concentrations of iron species, and of their ratios to the initial concentration of H2O2. Under optimized conditions, with a working potential of 0.40V vs. the saturated calomel electrode and a phosphate buffer solution (pH 7.5) as supporting electrolyte, the method enabled the quantitation of H2O2 in the concentration interval from 1.4 to 65 μg mL(-1) with a relative standard deviation of less than 10%. The results obtained for the H2O2 consumption are in good agreement with those obtained by parallel measurements related to the efficiency of organic matter removal.
authors.affiliation: Department of Chemistry, Biochemistry and Environmental Protection, Faculty of Sciences, University of Novi Sad, Trg D. Obradovića 3, 21000 Novi Sad, Serbia.
authors.forename: Jasmina
authors.initials: J
authors.lastname: Zbiljić
authors.affiliation: Department of Chemistry, Biochemistry and Environmental Protection, Faculty of Sciences, University of Novi Sad, Trg D. Obradovića 3, 21000 Novi Sad, Serbia.
authors.forename: Olga
authors.initials: O
authors.lastname: Vajdle
authors.affiliation: Department of Chemistry, Biochemistry and Environmental Protection, Faculty of Sciences, University of Novi Sad, Trg D. Obradovića 3, 21000 Novi Sad, Serbia. Electronic address: valeria.guzsvany@dh.uns.ac.rs.
authors.forename: Valéria
authors.initials: V
authors.lastname: Guzsvány
authors.affiliation: Department of Chemistry, Biochemistry and Environmental Protection, Faculty of Sciences, University of Novi Sad, Trg D. Obradovića 3, 21000 Novi Sad, Serbia.
authors.forename: Jelena
authors.initials: J
authors.lastname: Molnar
authors.affiliation: Department of Chemistry, Biochemistry and Environmental Protection, Faculty of Sciences, University of Novi Sad, Trg D. Obradovića 3, 21000 Novi Sad, Serbia.
authors.forename: Jasmina
authors.initials: J
authors.lastname: Agbaba
authors.affiliation: Department of Chemistry, Biochemistry and Environmental Protection, Faculty of Sciences, University of Novi Sad, Trg D. Obradovića 3, 21000 Novi Sad, Serbia.
authors.forename: Božo
authors.initials: B
authors.lastname: Dalmacija
authors.affiliation: Institute of Chemistry-Analytical Chemistry, Karl-Franzens University, A-8010 Graz, Austria. Electronic address: kurt.kalcher@uni-graz.at.
authors.forename: Kurt
authors.initials: K
authors.lastname: Kalcher
mesh_terms: D002244:Carbon / Q000737:chemistry; D004566:Electrodes; D052918:Environmental Restoration and Remediation / Q000379:methods*; D060587:Groundwater / Q000737:chemistry*; D006812:Humic Substances / Q000032:analysis*; D057446:Hydrodynamics; D006861:Hydrogen Peroxide / Q000032:analysis* / Q000737:chemistry; D007501:Iron / Q000737:chemistry*; D017895:Manganese Compounds / Q000032:analysis* / Q000737:chemistry*; D010087:Oxides / Q000032:analysis* / Q000737:chemistry*; D055771:Serbia; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: C045076:Fenton's reagent; D006812:Humic Substances; D017895:Manganese Compounds; D010087:Oxides; D014874:Water Pollutants, Chemical; C027424:manganese oxide; D002244:Carbon; D006861:Hydrogen Peroxide; D007501:Iron
keywords: Fenton and Fenton-like process; H(2)O(2) determination; Hydrodynamic chronoamperometry; MnO(2)-CPE; Natural organic matter removal