title: Using S and Pb isotope ratios to trace leaching of toxic substances from an acid-impacted industrial-waste landfill (Pozdatky, Czech Republic).
abstract: Slightly elevated concentrations of toxic species in waters sampled in the surroundings of a leaky landfill may be both a sign of an approaching contaminant plume, or a result of water-rock interaction. Isotopes can be instrumental in distinguishing between anthropogenic and geogenic species in groundwater. We studied sulfur and lead isotope ratios at an abandoned industrial-waste landfill, located in a densely populated part of Central Europe. Stable isotope variability in space and time was used to follow the movement of a groundwater plume, contaminated with toxic metals (Cd, Cr, Be), in fractured granitoids. Toxic metals had been mobilized from industrial waste by a strong pulse of sulfuric acid, also deposited in the landfill. Both tracers exhibited a wide range of values (δ(34)S between +2.6 and +18.9‰; (206)Pb/(207)Pb between 1.16 and 1.39), which facilitated identification of mixing end-members, and made it possible to assess the sources of the studied species. In situ fractionations did not hinder source apportionment. Influx of contaminated groundwater was observed neither in irrigation wells in a nearby village, nor at distances greater than 300 m from the landfill. Combination of stable isotope tracers can be used as part of an early-warning system in landscapes affected by landfills.
authors.affiliation: Czech Geological Survey, Geologicka 6, 152 00 Prague 5, Czech Republic. martin.novak@geology.cz
authors.forename: Martin
authors.initials: M
authors.lastname: Novak
authors.forename: Petra
authors.initials: P
authors.lastname: Pacherova
authors.forename: Lucie
authors.initials: L
authors.lastname: Erbanova
authors.forename: Alain J
authors.initials: AJ
authors.lastname: Veron
authors.forename: Frantisek
authors.initials: F
authors.lastname: Buzek
authors.forename: Ivana
authors.initials: I
authors.lastname: Jackova
authors.forename: Tomas
authors.initials: T
authors.lastname: Paces
authors.forename: Lenka
authors.initials: L
authors.lastname: Rukavickova
authors.forename: Vladimir
authors.initials: V
authors.lastname: Blaha
authors.forename: Jan
authors.initials: J
authors.lastname: Holecek
mesh_terms: D018153:Czech Republic; D004784:Environmental Monitoring / Q000379:methods*; D060587:Groundwater / Q000032:analysis; D007220:Industrial Waste; D007554:Isotopes; D007854:Lead; D012037:Refuse Disposal; D013460:Sulfur Isotopes; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D007220:Industrial Waste; D007554:Isotopes; D013460:Sulfur Isotopes; D014874:Water Pollutants, Chemical; D007854:Lead