Distribution, Transport and Reaction of Polar Aromatic Compounds in Groundwater with Regard to Site Typical Solid Phases. SPP „Geochemical Processes with Long-Term Effects in Anthropogenically-Influenced Seepage- and Groundwater" (polare Aromate)
| Contact: | Fritz H. Frimmel | ||
|---|---|---|---|
| Project Group: | DFG Priority Program | ||
| Funding: | DFG | ||
Period
Description
Distribution, Transport and Reaction of Polar Aromatic Compounds in Groundwater with Regard to Site Typical Solid Phases.
SPP: „Geochemical Processes with Long-Term Effects in Anthropogenically-Influenced Seepage- and Groundwater"
(polare Aromate)
As a part of the Priority Program "Geochemical processes with long-term effects in anthropogenically-influenced seepage- and groundwater" funded by Deutsche Forschungsgemeinschaft (DFG) the project "Distribution, transport and reaction of polar aromatic compounds in groundwater with regard to site typical solid phases" was continued in the third year. The work in 1998 was focused on analytical investigations of aqueous samples from the site of a former gas facility. An analytical method to determine oxidized aromatic compounds with solid phase preconcentration, sample cleanup and HPLC separation with diodearray detection was worked out. The oxidized aromatic compounds phenanthridinone, acridinone and fluorenone can be considered as metabolites of typical tar oil related pollutants and are of toxicological interest. The determination of the occurence and the distribution of this oxidized compounds in the contamination plume is of importance for an enhanced assessment of a contaminated site.
In our previous research studies N-heterocyclic compounds and oxidized metabolites of fluorene (9-fluorenon, hydroxychinolin-derivatives, 6(5H)-phenanthridinone and 9(10H)-acridinone) could be identified. For the sensitive determination of these compounds in the downstream area an analytical method with a higher detection limit and selectivity like the LC/MS has to be used. The subsoil transport of these compounds is mainly influenced by the sorption to clay minerals. In this sorption process, the ion exchange of the cationic form of the compounds (e. g. from 4-hydroxychinolone) is preferred. It was shown that the sorption is mainly influenced by the pH-value, humic substances and calcium ions. Investigations on these influences will be continued using material from the test site "Süd". Xenobiotics bound on fulvic acid fractions isolated from the test site "Süd" could be extracted by solvents. This showed that the sorption was reversible. Further investigations will focus on bound residues.
