Inside-sediment partitioning of PAH, PCB and organochlorine compounds and inferences on sampling and normalization methods |
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Authors: | Opel Oliver Palm Wolf-Ulrich Steffen Dieter Ruck Wolfgang K L |
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Institution: | a Leuphana University of Lueneburg, Institute for Ecology and Environmental Chemistry, Scharnhorststrasse 1/13, 21335 Lueneburg, Germany b Lower Saxony Water Management, Coastal Defence and Nature Conservation Agency, Division Hannover-Hildesheim, An der Scharlake 39, 31135 Hildesheim, Germany |
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Abstract: | Comparability of sediment analyses for semivolatile organic substances is still low. Neither screening of the sediments nor organic-carbon based normalization is sufficient to obtain comparable results. We are showing the interdependency of grain-size effects with inside-sediment organic-matter distribution for PAH, PCB and organochlorine compounds. Surface sediment samples collected by Van-Veen grab were sieved and analyzed for 16 PAH, 6 PCB and 18 organochlorine pesticides (OCP) as well as organic-matter content. Since bulk concentrations are influenced by grain-size effects themselves, we used a novel normalization method based on the sum of concentrations in the separate grain-size fractions of the sediments. By calculating relative normalized concentrations, it was possible to clearly show underlying mechanisms throughout a heterogeneous set of samples. Furthermore, we were able to show that, for comparability, screening at <125 μm is best suited and can be further improved by additional organic-carbon normalization. |
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Keywords: | Organic pollutants Grain-size partitioning Organic carbon Sediment Normalization |
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