title: Use of a stable carbon isotope to assess the efficiency of a drinking water treatment method with CO₂.
abstract: CO₂ gas with a special isotopic signature (δ¹³C = -35.2‰ vs. VPDB) was used as a marker to evaluate the efficiency of a drinking water treatment method and the effect of an ultrasonic (US) stirrer. This treatment was developed to prevent precipitation and corrosion effects in water-supply systems. The research work was performed using a laboratory-scale pilot plant that was filled with tap water. The stable isotope analyses of δ¹³C-DIC (Dissolved Inorganic Carbon) in the water samples indicated that the maximum content of added CO₂ gas in DIC was in the range of 35 to 45%. The use of the US stirrer during the entire experiment decreased the method's overall efficiency by 10%, due to degassing at a late stage of the experiment but accelerated the dissolution process in the early experimental stage.
authors.affiliation: IOS, Institute of Environmental Protection and Sensors, Beloruska 7, SI-2000 Maribor, Slovenia. mojca.poberznik@ios.si
authors.forename: M
authors.initials: M
authors.lastname: Poberžnik
authors.forename: A
authors.initials: A
authors.lastname: Leis
authors.forename: A
authors.initials: A
authors.lastname: Lobnik
mesh_terms: D002245:Carbon Dioxide / Q000737:chemistry*; D002247:Carbon Isotopes; D010865:Pilot Projects; D018508:Water Purification / Q000295:instrumentation* / Q000379:methods*; D014881:Water Supply / Q000032:analysis* / Q000592:standards
chemical_list: D002247:Carbon Isotopes; D002245:Carbon Dioxide