Anne Kreutzer has successfully completed her doctorate

Anne Kreutzer successfully defended her dissertation on the topic: “Passive Sampling and Passive Dosing – an innovative approach for combined chemical and biological analysis of hydrophobic organic contaminants in marine sediment pore water”.

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Anne Kreutzer completed both the defense and the dissertation with a very good grade. The dissertation was developed in a cooperative PhD between HAW Hamburg and Goethe University Frankfurt am Main within a DFG project (WI1410/10-1).

Anne Kreutzer was funded by the PhD support program of HAW Hamburg through the award of a three-year E13/2 position.

The aim of her PhD project was the development of innovative indicators that allow a spatially structured description and assessment of the pollution situation and the risk potential of sediment-bound pollutants in marine systems. This made it possible for the first time to collect data on the toxicity of pore water concentrations of hydrophobic organic pollutants with very low uncertainty, to correlate them directly with a chemical analysis, and finally to verify them using appropriate artificial mixtures. To achieve this, Ms. Kreutzer applied in situ equilibrium samplers (passive samplers) based on solid phase microextraction (passive sampling) adapted for the study of hydrophobic organic pollutants in the marine environment. Subsequently, the pollutant mixtures collected by means of silicone hollow fibers were directly introduced into small-scale bioassay systems by the principle of “passive dosing”. By introducing the fibers into the test systems directly after sampling, the prior extraction of the fibers could be omitted This significantly reduced the risk of altering the original sample composition. Collected data are therefore highly representative of the actual loading situation on site. Furthermore, the analyzed contaminant mixtures were artificially reconstituted to be tested in bioassays at different concentrations by means of “passive dosing”. This made it possible to generate concentration-response curves that allow the risk posed by the sediment-bound pollutants to be estimated (mixed toxicity).

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