Kemijska karakterizacija vode Briksdalsbreen ledenjaka, Norveška

• Main Authors: Plavšić, Marta, Strmečki, Slađana, Cuculić, Vlado
• Format: Article in Journal/Newspaper
• Language: English; Croatian
• Published: Croatian Water 2018
• Subjects: Briksdalsbreen ledenjak; voda otopljenog ledenjaka; ioni metala; organska tvar; DOC; Briksdalsbreen glacier; glacial meltwater; metal ions; organic matter; Norway; glacier
• Online Access: https://hrcak.srce.hr/203277; https://hrcak.srce.hr/file/299228; https://hrcak.srce.hr/file/299227

Ledenjaci su dinamički, prirodni elementi koji se smatraju najboljim indikatorom klimatskih promjena i zagađenja zbog njihove izoliranosti, osjetljivosti i dugovječnosti. Uzorkovana je otopljena voda Briksdalsbreen ledenjaka (Norveška), dijela najvećeg ledenjaka u kontinentalnoj Europi, da bi se odredile koncentracije i vrste toksičnih metala i organske tvari i procijenio njihov utjecaj na osjetljivi okoliš ledenjaka. Mjerene su površinski aktivne tvari (PAT), kapacitet kompleksiranja za ione bakra (CuCC), katalitički aktivni organski spojevi (CAC), reaktivni sumporni spojevi (RSS), otopljeni/partikulatni tragovi iona metala, te otopljena organska tvar (DOC). Određene su vrlo niske koncentracije DOC (0,21 mg C/L). Sve mjerene koncentracije, uključujući tragove metala (Cd, Cu, Zn, Pb, Ni i Co) su niske. Bakrovi ioni su prisutni kao otopljeni organski kompleksi koji su određeni kao CuCC (60,9 nM; sa prividnom konstantom kompleksiranja log K = 9,6). Cd je prisutan pretežito u otopljenoj fazi, dok su Zn, Pb, Ni i Co prisutni pretežito u partikulatnom obliku. Glaciers are dynamic, natural elements that are considered the best indicator of climate change and pollution due to their isolation, sensitivity and longevity. Dissolved water from the Briksdalsbreen glacier (Norway), a part of a larger glacier in the continental Europe, was sampled to determine the concentrations and types of toxic metals and organic matter and assess their impact on the sensitive glacial environment. Surface-active substances (SAS), complexing capacity of copper ions (CuCC), catalytically active organic compounds (CAC), reactive sulfur compounds (RSC), dissolved/particulate trace metals and dissolved organic matter (DOC) were measured. The determined DOC concentrations were very low (0.21 mg C/L). All measured concentrations, including trace metals (Cd, Cu, Zn, Pb, Ni and Co) were very low. Copper ions were present as dissolved organic complexes that were determined as CuCC (60.9 nM; with apparent complexing constant log K = 9.6). Cd was predominantly present in the dissolved phase, whereas Zn, Pb, Ni and Co were predominantly present in the particulate form.