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Persistent organic pollutants in wood fiber-contaminated sediments from the Baltic Sea

Dahlberg, Anna-Karin and Apler, Anna and Vogel, Lisa and Wiberg, Karin and Josefsson, Sarah (2020). Persistent organic pollutants in wood fiber-contaminated sediments from the Baltic Sea. Journal of Soils and Sediments. 20 , 2471-2483
[Research article]

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Purpose Many coastal areas in the Baltic Sea are contaminated with wood fiber and pollutants from pulp and paper industries. These anthropogenic, organic-rich, sediments (fiberbanks) have not been characterized and knowledge about their role as secondary sources for dispersal of persistent organic pollutants (POPs) is limited. Hence, the aim of this study was to elucidate the fate of POPs and the relationships between sorption (K-D and K-TOC), sediment type, and compound hydrophobicity (K-OW) in fiber-contaminated sediments. Materials and methods Paired sediment and pore water samples (n = 24 sites) from three fiber-contaminated areas, located in the angstrom ngermanalven river estuary in northern Sweden, were analyzed for POPs (viz. PCBs, DDT, and HCB) in sediment types representing different fiber content (i.e., fiberbanks, fiber-rich sediments, and natural less fiber impacted sediments). The freely dissolved concentration in sediment pore water was determined by sediment-polyoxymethylene (POM) partitioning. Instrumental analysis was performed using gas chromatography coupled to a triple quadrupole mass spectrometer (GC-MS/MS). Results and discussion Higher levels of total organic carbon (TOC) were found in the fiberbank sediment (range 8.6-37%) than in fiber-rich sediment (range 2.0-6.5%) and more natural sediment (range 2.0-2.9%). The sediment concentrations of POPs (dry weight basis) were also found to be significantly (p < 0.05) elevated in fiberbanks compared to the other sediment types. The fraction of DDD (48-66% of sigma 6DDX) was larger in fiberbanks than in the other sediment types, likely due to anoxic conditions favoring reductive dechlorination of DDT. When sediment levels were normalized to TOC, HCB displayed similar levels across sediment type, suggesting a more diffuse source pattern than for PCB and DDT. Although significantly higher sorption (K-D) of POPs was observed in fiberbanks, pore water levels were still elevated due to high bulk concentrations. Conclusions This study shows that fiberbanks are coastal hot spots for POPs in the Baltic Sea and that the levels are of ecotoxicological concern. Although the POPs are more strongly sorbed (K-D) to this type of organic rich sediment, the high pore water concentrations in fiberbanks compared to the other sediment types investigated show that the risk of contaminant dispersal via pore water is elevated for fiberbanks.

Authors/Creators:Dahlberg, Anna-Karin and Apler, Anna and Vogel, Lisa and Wiberg, Karin and Josefsson, Sarah
Title:Persistent organic pollutants in wood fiber-contaminated sediments from the Baltic Sea
Series Name/Journal:Journal of Soils and Sediments
Year of publishing :2020
Page range:2471-2483
Number of Pages:13
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Environmental Sciences (social aspects to be 507)
Keywords:Chlorinated pollutants, Fibrous sediment, Organic carbon, Pore water, Pulp and paper emissions
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Additional ID:
Type of IDID
Web of Science (WoS)000528598500014
ID Code:17084
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Aquatic Sciences and Assessment
Deposited By: SLUpub Connector
Deposited On:02 Jun 2020 07:51
Metadata Last Modified:15 Jan 2021 19:19

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