Abstract
Background, aim, and scope
The paper describes the spatial contamination of the River Kymijoki, South-Eastern Finland, and the coastal region of the Gulf of Finland with PCDD/Fs and mercury. The findings of ecotoxicologial and human health studies are also reported, including environmental and human risk assessments. Sediments from the River Kymijoki, draining into the Gulf of Finland, have been heavily polluted by the pulp and paper industry and by chemical industries. A wood preservative, known as Ky-5, was manufactured in the upper reaches of the river between 1940 and 1984 causing severe pollution of river sediments with polychlorinated dibenzo-p-dioxins (PCDD) and dibenzofurans (PCDF). Moreover, the sediments have been polluted with mercury (Hg) from chlor-alkali production and the use of Hg as a slimicide in pulp and paper manufacturing.
Materials and methods
An extensive sediment survey was conducted as well as sediment transport modeling, toxicity screening of sediment invertebrates, and a survey of contaminant bioaccumulation in invertebrates and fish. Studies on human exposure to PCDD/Fs and the possible effects on hypermineralization of teeth as well as an epidemiological study to reveal increased cancer risk were also conducted. An assessment of the ecological and human health risks with a null hypothesis (no remediation) was undertaken.
Results
The sediment survey revealed severe contamination of river and coastal sediments with PCDD/Fs and Hg. The total volume of contaminated sediments was estimated to reach 5 × 106 m3 and hot spots with extremely high concentrations (max 292,000 ng g−1 or 1,060 ng I-TEQ g−1 d.w.) were located immediately downstream from the pollution source (approximately 90,000 m3). Sediment contamination was accompanied by changes in benthic assemblages, but direct effects were masked by many factors. The fish showed only slightly elevated PCDD/F levels in muscle, but orders of magnitude higher in the liver compared with reference freshwater sites and the Baltic Sea. The concentrations in human fat did not reveal high human exposure in the Kymijoki area in general and was lower than in sea fishermen. The relative risk for total cancer among farmers was marginally higher (RR = 1.13) among those living close to the river, compared with farmers living further away, and the possibility of increased cancer risk cannot be ruled out. A conservative risk assessment revealed that the present probability of exceeding the WHO upper exposure limit of 4 pg WHO-TEQ kg−1 d−1 for PCDD/Fs and DL-PCBs was 6%. The probability of exceeding the WHO limit value of 0.23 μg kg−1 d−1 for methyl mercury was estimated to be notably higher at 62%. Based on these studies and the estimated risks connected with different remediation techniques a general remediation plan with cost benefit analysis was generated for several sub-regions in the river. Dredging, on-site treatment, and a close disposal of the most contaminated sediments (90,000 m3) was suggested as the first phase of the remediation. The decision regarding the start of remediation will be made during autumn 2008.
Conclusions
The sediments in the River Kymijoki are heavily polluted with PCDD/Fs and mercury from earlier chlorophenol, chlor-alkali, and pulp and paper manufacturing. A continuous transport of contaminants is taking place to the Gulf of Finland in the Baltic Sea. The highly increased PCDD/F and Hg levels in river sediments pose an ecotoxicological risk to benthic fauna, to fish-eating predators and probably to human health. The risks posed by mercury exceed those from PCDD/Fs and need to be evaluated for (former) chlor-alkali sites and other mercury releasing industries as one basis for remediation decision making.
Recommendations and perspectives
The studies form the basis of a risk management strategy and a plan for possible remediation of contaminated sediments currently under consideration in the Southeast Finland Regional Environment Centre. It is recommended that a detailed restoration plan for the most seriously contaminated areas should be undertaken. Based on current knowledge, the restoration of the whole river is not feasible, considering the current risk caused by the contaminated sediment in the river and the costs of an extensive restoration project. The experiences gained in the present case should be utilized in the evaluation of PCDD/F- and mercury-contaminated sites in other countries. The case demonstrates that the historic reservoirs are of contemporary relevance and should be addressed, e.g., in the national implementation plans of the Stockholm Convention.
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References
Alaluusua S, Lukinmaa P-L, Torppa J, Tuomisto J, Vartiainen T (1999) Developing teeth as biomarker of dioxin exposure. Lancet 353:206
Alfthan G (1995) Exposure to mercury from fish in high-fish consumers in Finland (in Finnish). Publications of the National Public Health Institute, Series B9/1995
Hanski A, Päätalo K (2007) Contaminated sediments in river Kymijoki—a general remediation plan (in Finnish). South-Eastern Finland Regional Environment Centre. Mimeographed report 82116159, 1.6.2007, Ramboll Finland Oy
Hölttä P, Kiviranta H, Leppäniemi A, Vartiainen T, Lukinmaa P-L, Alaluusua S (2001) Developmental dental defects in children who reside by a river polluted by dioxins and furans. Arch Environ Health 56:522–528
Humppi T, Heinola K (1985) Synthesis and gas chromatographic–mass spectrometric determination of polychlorinated dibenzo-p-dioxins and related compounds in the technical chlorphenol formulation Ky-5. J Chromatogr 331:410–418
Isosaari P (2004) Polychlorinated dibenzo-p-dioxin and dibenzofuran contamination of sediments and photochemical decontamination of soils. PhD thesis, University of Kuopio, Faculty of Natural and Environmental Sciences
Isosaari P, Kankaanpää H, Mattila J, Kiviranta H, Verta M, Salo S, Vartiainen T (2002) Spatial distribution and temporal accumulation of polychlorinated dibenzo-p-dioxins, dibenzofurans, and biphenyls in the Gulf of Finland. Environ Sci Technol 36:2560–2565
Karvonen T, Hepojoki A, Nurminen J, Verta M, Salo S, Malve O (2005) Using mathematical model to assess remediation options to dioxin- and mercury contaminated sediments in river Kymijoki (In Finnish). Mimeographed Report, Helsinki University of Technology and Finnish Environment Institute
Kiirikki M, Lindfors A (2006) Assessment of erosion of suspended solids to River Kymijoki from sediment construction at Koria 29.9.–20.10.1999. (In Finnish). Report of Luode Consulting Oy, 4.12.2006
Kiiski A, Hämäläinen H, Salo S, Verta M, Kukkonen J (2005) Incidence of midge (Diptera, Chironomidae) larval deformities in the assessment of biologically hazardous sediments. In: Meriläinen P, Sivula L, Oikari A. (eds), Seventh international conference of environmental sciences Jyväskylä, May 12–13, 2005. Science for sustainability: Proceedings, Jyväskylä, Finnish Society for Environmental Sciences, University of Jyväskylä, p 225
Kiviranta H (2005) Exposure and human PCDD/F and PCB body burden in Finland. PhD Thesis, Publications of the National Public Health Institute A 14/2005
Kiviranta H, Verta M, Korhonen H, Vartiainen T (1999a) Human exposure to Ky-5 originating PCDD/Fs in Kymijoki area, Finland. Organohalogen Comp 44:169–172
Kiviranta H, Purkunen R, Vartiainen T (1999b) Levels and trends of PCDD/Fs and PCBs in human milk in Finland. Chemosphere 38:311–323
Kiviranta H, Vartiainen T, Verta M, Tuomisto JT, Tuomisto J (2000) High fish-specific dioxin concentrations in Finland. Lancet 355:1883–1885
Kiviranta H, Vartiainen T, Tuomisto J (2002) Polychlorinated dibenzo-p-dioxins, dibenzofurans, and biphenyls in fishermen in Finland. Environ Health Persp 110:355–361
Kiviranta H, Vartiainen T, Parmanne R, Hallikainen A, Koistinen J (2003) PCDD/Fs and PCBs in Baltic herring during the 1990s. Chemosphere 50:1201–1216
Kiviranta H, Tuomisto JT, Tuomisto J, Tukiainen E, Vartiainen T (2005) Polychlorinated dibenzo-p-dioxins, dibenzofurans, and biphenyls in the general population in Finland. Chemosphere 60:854–869
Kokko H, Turunen T (1988) Mercury emissions to River Kymijoki and fish mercury concentrations up to 1986 (in Finnish). Vesitalous 3:30–38
Korhonen M, Verta M, Lehtoranta J, Kiviranta H, Vartiainen T (2001) Concentrations of polychlorinated dibenzo-p-dioxins and furans in fish downstream from a Ky-5 manufacturing. Chemosphere 43:587–593
Lyytikäinen M (2004) Transport, bioavailability and effects of Ky-5 and CCA wood preservative components in aquatic environment. PhD Thesis, Department of Biology, University of Joensuu, Finland
Malve O, Salo S, Verta M, Forsius J (2003) Modelling the transport of PCDD/F compounds in a contaminated river and the possible influence of restoration dredging on calculated fluxes. Environ Sci Technol 37:3413–3421
Munthe J, Bodaly RA, Branfireun BA, Driscoll CT, Gilmour CG, Harris R, Horvat M, Lucotte M, Malm O (2007) Recovery of mercury-contaminated fisheries. Ambio 36:33–44
Rappe C, Kjeller L-O, Kulp SE, de Wit C, Hasselsten I, Palm O (1991) Levels, profile and pattern of PCDDs and PCDFs in samples related to the production and use of chlorine. Chemosphere 21:1629–1636
Rossi E (2005) An assessment of environmental and health risks caused by the contaminated sediments of river Kymijoki (in Finnish). South-Eastern Finland Regional Environment Centre, Kouvola, Finland
Salo S, Verta M, Malve M, Korhonen M, Lehtoranta J, Kiviranta H, Isosaari P, Ruokojärvi P, Koistinen J, Vartiainen T (2008) Contamination of River Kymijoki sediments with polychlorinated dibenzo-p-dioxins, dibenzofurans and mercury and their transport to the Gulf of Finland in the Baltic Sea. Chemosphere Sept. 19, doi:10.1016/j.chemosphere.2008.07.085>
Tuomisto JT, Pekkanen J, Kiviranta H, Tukiainen E, Vartiainen T, Tuomisto J (2004) Soft-tissue sarcoma and dioxin: a case-control study. Int J Cancer 108:893–900
Turunen A, Verkasalo PK, Kiviranta H, Pukkala E, Jula A, Männistö S, Räsänen R, Marniemi J, Vartiainen T (2008) Mortality in a cohort with high fish consumption. Int J Epidemiol 37:1008–1017
UNEP (2002) Global mercury assessment. Report by UNEP Chemicals, Geneva, Switzerland, December 2002, p 129, http://www.chem.unep.ch/mercury/
Vartiainen T, Lampi P, Tolonen K, Tuomisto J (1995) Polychlorodibenzo-p-dioxin and poly-chlorodibenzofuran concentrations in lake sediments and fish after a ground water pollution with chloro-phenols. Chemosphere 30:1439–1451
Verta M, Ahtiainen J, Hämäläinen H, Jussila O, Järvinen H, Kiviranta H, Korhonen M, Kukkonen J, Lehtoranta J, Lyytikäinen M, Malve O, Mikkelson P, Moisio V, Niemi A, Paasivirta J, Palm H, Rantalainen A-L, Salo S, Vartiainen T, Vuori K-M (1999a) Organochlorine compounds and heavy metals in the sediment of River Kymijoki; occurrence, transport, impacts and health risks (In Finnish). Publications of the Finnish Environment Institute, No 334
Verta M, Korhonen M, Lehtoranta J, Salo S, Vartiainen T, Kiviranta H, Kukkonen J, Hämäläinen H (1999b) Ecotoxicological and health effects caused by PCPs, PCDEs, PCDDs, and PCDFs in Kymijoki sediments, South-Eastern Finland. DIOXIN 99. 19th International Symposium on halogenated environmental organic pollutants and POPs. September 12–17, 1999. Venice, Italy. Organohalogen Comp 43:239–242
Verta M, Lehtoranta J, Salo S, Korhonen M, Kiviranta H (1999c) High concentrations of PCDDs, and PCDFs in River Kymijoki sediments, South-Eastern Finland, caused by wood preservative Ky-5. DIOXIN 99. 19th International Symposium on halogenated environmental organic pollutants and POPs. September 12–17, 1999. Organohalogen Comp 43:261–264
Verta M, Salo S, Korhonen M, Assmuth T, Kiviranta H, Koistinen J, Ruokojärvi P, Isosaari P, Bergqvist P-A, Tysklind M, Cato I, Vikelsøe J, Larsen MM (2007) Dioxin concentrations in sediments of the Baltic Sea—a survey of existing data. Chemosphere 67:1762–1775
Verkasalo PK, Kokki E, Pukkala E, Vartiainen T, Kiviranta H, Penttinen A, Pekkanen J (2004) Cancer risk near a polluted river in Finland. Environ Health Persp 112:1026–1031
Vesivalo J, Salo S, Mykkänen E, Aunola T, Hietapakka U, Malve O, Verta M (2002) Test dredging of contaminated sediments in Kymijoki river in 2001 (in Finnish). Regional Environmental Publications; 286—Kouvola: Southeast Finland Regional Environment Centre, Finland, 2002
Weber R, Gaus C, Tysklind M, Johnston P, Forter M, Hollert H, Heinisch E, Holoubek I, Lloyd-Smith M, Masunaga S, Mocarelli P, Santillo D, Seike N, Symons R, Torres JPM, Verta M, Varbelow G, Vijgen J, Watson A, Costner P, Woelz P, Wycisk P, Zenneg M (2008a) Dioxin- and POP-contaminated sites—contemporary and future relevance and challenges. Environ Sci Pollut Res 15:363–393
Weber R, Tysklind M, Gaus C (2008b) Dioxin—contemporary and future challenges of historical legacies. Environ Sci Pollut Res 15:96–100
Acknowledgement
The Ministry of the Environment, Finland and UPM-Kymmene Corporation are acknowledged for their financial support and the South-Eastern Regional Environment Centre for their support in field sampling.
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Verta, M., Kiviranta, H., Salo, S. et al. A decision framework for possible remediation of contaminated sediments in the River Kymijoki, Finland. Environ Sci Pollut Res 16, 95–105 (2009). https://doi.org/10.1007/s11356-008-0061-9
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DOI: https://doi.org/10.1007/s11356-008-0061-9