An Assessment of Water and Sediment Quality of the Danube River: Polycyclic Aromatic Hydrocarbons and Trace Metals
Water and sediment samples from the Danube River and Moson Danube Arm (Hungary) have been collected and analyzed for contamination by 18 polycyclic aromatic hydrocarbons (PAHs) and eight trace metal(loid)s (As, Cu, Pb, Ni, Cr, Cd, Hg and Zn) in the period of 2014-2015. Moreover, the trace metal(loid) concentrations were measured in the Rába and Marcal rivers (parts of the tributary system feeding the Danube). Total PAH contents in water were found to vary from 0.016 to 0.133 µg/L and concentrations in sediments varied in the range of 0.118 mg/kg and 0.283 mg/kg. Source analysis of PAHs using diagnostic concentration ratios indicated that PAHs found in sediments were of pyrolytic origins. The dissolved trace metal and arsenic concentrations were relatively low in the surface waters. However, higher concentrations were detected in the water samples of Rába (Zn, Cu, Ni, Pb) and Marcal (As, Cu, Ni, Pb) compared to the Danube and Moson Danube. The concentrations of trace metals in sediments were higher than those found in water samples.
 A. J. Horowitz, A primer on sediment-trace element chemistry, 2nd edition. United States Geological Survey: Denver, Open-File Report 91-76, 1991.
 ATSDR, Toxicological proﬁle for polycyclic aromatic hydrocarbons. Agency for Toxic Substances and Disease Registry (ATSDR): Atlanta, GA, U.S. Department of Health and Human Services, 1995.
 E. Manoli, and C. Samara, “Polycyclic aromatic hydrocarbons in natural waters: sources, occurrence and analysis,” Trends Anal. Chem., vol. 18, no. 6, pp. 417–428, 1999.
 K. Srogi, “Monitoring of environmental exposure to polycyclic aromatic hydrocarbons: a review,” Environ. Chem. Lett., vol. 5, pp. 169–195, 2007.
 E. C. Okafor; and K. Opuene, “Preliminary assessment of trace metals and polycyclic aromatic hydrocarbons in the sediments,” Int. J. Environ. Sci. Tech., vol. 4, no. 2, pp. 233–240, 2007.
 J. Ruelas-Inzunza, P. Spanopoulos-Zarco, and F. Páez-Osuna, “Cd, Cu, Pb and Zn in clams and sediments from an impacted estuary by the oil industry in the southwestern Gulf of Mexico: Concentrations and bioaccumulation factors,” J. Environ. Sci. Health A, vol. 44, no. 14, 1503–1511, 2009.
 G. Beasley, and P. E. Kneale, “Investigating the influence of heavy metals on macro-invertebrate assemblages using Partial Cononical Correspondence Analysis (pCCA),” Hydrol. Earth Syst. Sci. Discuss., vol. 7, no. 2, pp. 221–233, 2003.
 S. Zrncic, D. Oraic, M. Caleta, Z. Mihaljevic, D. Zanella, and N. Bilandzic, “Biomonitoring of heavy metals in fish from the Danube River,“ Environ. Monit. Assess., vol. 185, no. 2, 1189–1198, 2013.
 O. O. Ajiboye, A. F. Yakubu, and T. E. Adams, “A review of polycyclic aromatic hydrocarbons and heavy metal contamination of fish from fish farms,” J. Appl. Sci. Environ. Manage., vol. 15, no. 1, 235–238, 2011.
 A. S. Nagy, G. Simon, J. Szabó, and I. Vass, “Polycyclic aromatic hydrocarbons in surface water and bed sediments of the Hungarian upper section of the Danube River,” Environ. Monit. Assess., vol. 185, no. 6, 4619–4631, 2013.
 A. S. Nagy, J. Szabó, and I. Vass, “Evaluation of trace metal levels in surface water and sediments of the Hungarian upper section of the Danube River and its tributaries,” J. Environ. Sci. Health A, vol. 51, no. 14, pp. 1248–1261, 2016.
 EU Directive, European Communities environmental objectives (surface waters) regulations 2009. S.I. No. 272 of 2009.
 EU Directive, European Union environmental objectives (surface waters) (amendment) regulations. S.I. No. 386 of 2015.
 Hungarian Decree, 49/2015. (IX. 8.) BM 17. §, 8. Amendments to Ministerial Decrees on Water and Water Protection. Hungarian Ministry of Interior: Budapest, 2015. (In Hungarian).
 Hungarian Decree, 6/2009. (IV. 14.) KvVM-EüM-FVM. KvVM-EüM-FVM common decree on the pollution threshold limit values for geological medium and groundwater protection and pollution measuring. Ministry of Environment and Water Management, Ministry of Health and Ministry of Agriculture: Budapest, 2009. (In Hungarian).
 Dutch Guidelines, Circular on target values and intervention values for soil remediation. Ministry of Housing, Spatial Planning and Environment Directorate-General for Environmental Protection: Netherlands, 2000.
 P. Woitke, J. Wellmitz, D. Helm, P. Kube, P. Lepom, and P. Litheraty, “Analysis and assessment of heavy metal pollution in suspended solids and sediments of the river Danube,” Chemosphere, vol. 51, no. 8, 633–642, 2003.
 D. M., Crnkovic, N. S. Crnkovic, A. J. Filipovic, L. V. Rajakovic, A. A. Peric-Grujic, and M. D. Ristic, “Danube and Sava river sediment monitoring in Belgrade and its surroundings,” J. Environ. Sci. Health A, vol. 43, no. 12, pp. 1353–1360, 2008.