title: Effect of selected metal ions on the photocatalytic degradation of bog lake water natural organic matter.
abstract: Herein we report the photocatalytic degradation of natural organic matter from a bog lake (Lake Hohloh, Black Forest, Germany) in the presence of 0, 5, and 10 μmol L(-1) of added Cu(2+), Mn(2+), Zn(2+) and Fe(3+). The reactions were followed by size exclusion chromatography with organic carbon detection (SEC-DOC) and by measurements of low molecular weight organic acids. Addition of Cu(2+) had the largest effect of all four studied metals, leading to a retardation in the molecular size changes in NOM: degradation of the larger molecular weight fraction was inhibited leading to reduced production of smaller molecular weight metabolites. Similarly, addition of Cu(2+) reduced the production of formic and oxalic acids, and reduced the bioavailability of the partially degraded NOM.
authors.affiliation: Water Chemistry, Engler-Bunte-Institut, Karlsruhe Institute of Technology, Engler-Bunte-Ring 1, 76131 Karlsruhe, Germany. luis.tercero@gmail.com
authors.forename: Luis A Tercero
authors.initials: LA
authors.lastname: Espinoza
authors.forename: Eike
authors.initials: E
authors.lastname: ter Haseborg
authors.forename: Matthias
authors.initials: M
authors.lastname: Weber
authors.forename: Elly
authors.initials: E
authors.lastname: Karle
authors.forename: Rafael
authors.initials: R
authors.lastname: Peschke
authors.forename: Fritz H
authors.initials: FH
authors.lastname: Frimmel
mesh_terms: D000143:Acids / Q000737:chemistry*; D002850:Chromatography, Gel; D002852:Chromatography, Ion Exchange; D003300:Copper / Q000737:chemistry; D007477:Ions / Q000737:chemistry; D008345:Manganese / Q000737:chemistry; D008670:Metals / Q000737:chemistry*; D008970:Molecular Weight; D009930:Organic Chemicals / Q000737:chemistry*; D010777:Photochemistry; D012722:Sewage / Q000382:microbiology; D015032:Zinc / Q000737:chemistry
chemical_list: D000143:Acids; D007477:Ions; D008670:Metals; D009930:Organic Chemicals; D012722:Sewage; D008345:Manganese; D003300:Copper; D015032:Zinc