Naslov
Chemical and magnetic tracing of pollutants in the Mrežnica River (Croatia)

Autori
Frančišković-Bilinski, Stanislav ; Bilinski, Halka ; Maldini, Krešimir ; Zhang, Qi ; Appel, Erwin

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
15th Castle meeting abstracts / Spassov, Simo ; Petrovsky, Eduard - Brisel : Royal meteorological institute of Belgium (RMI), 2016, 48-49

Skup
15th Castle meeting, New trends on paleo, rock and environmental magnetism

Mjesto i datum
Dinant, Belgija, 21.08.2016. - 27.08.2016

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
Magnetic susceptibility (χ); chemical composition; coal combustion products; river sediments

Sažetak
Coal slag and ash from coal-burning in a former textile factory at Duga Resa (Croatia) was discharged directly into the clean, karstic tufa-forming Mrežnica River for 110 years (1884-1994). The study area can serve as a model area to study pollutant transport downstream from the pollution source to the confluence with other rivers. Preliminary results from river sediments (grain size < 2 mm) were reported by Frančišković-Bilinski (2008). Meanwhile, more dense sampling and more extended magnetic measurements were performed (Zhang, 2014 ; Appel et al. 2016). In the present work, we aim to investigate which major and minor elements show an anomaly in particular locations of the investigated region, in addition to the distribution of magnetic susceptibility data. Applying statistical methods we analyze the possible correlation of anomalous elements with magnetic susceptibility. The study area with the 30 sampling locations is presented in Figure 1. Sampling of DR-1 to DR-24 was performed during May 2014, and DR-25 to DR-30 during September 2014. Sediment samples were first dried in open plastic boxes for one week, and afterwards milled using an agate mortar. Bulk non-sieved sediments were used for chemical analysis. Approximately 0.1 g of sediment was dissolved with 2.5 ml of suprapur HNO3 and 7.5 ml of puriss HCl in an Anton Paar Multiwave 3000 Oven. The elements contents were measured by ICP-MS (Elan 9000, Perkin Elmer, USA) with a solution of 20 µgL-1 Ge, Rh, In and Re as internal standard. For magnetic measurements the sample material was put into cylindrical plastic boxes (2.5 cm diameter). The mass of samples was determined for calculating mass-specific values. The measurements were carried out on a multifunction kappa-bridge MFK1-FA (AGICO, Brno, Czech Republic) using a CS-3 furnace apparatus for thermomagnetic cycling. From the results of the chemical analysis of 30 elements and from magnetic susceptibility data, a correlation matrix was determined. Anomalous values (extremes and outliers) were for each element identified for the corresponding sampling sites. Magnetic susceptibility shows extremes in stations DR-5, DR-1 and DR-3. At the same sites Fe and Al have extremes. Ba, Na, Sr, B and U appear as extremes or outliers at same sites. Other elements like Cd, Ni, Cr, Mo show extremes at sites further downstream. The spatial distribution in the river sediments of both magnetic particles and trace elements from coal-burning is obviously complex (transport hydrodynamic conditions and possible transformations due to redox conditions). There is a need for further research by statistical sampling and for additional analyses, especially determination of mineral composition.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

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