Samples were extracted based on a miniaturized solid-liquid extraction method (MISOLEX; . In brief: 0.5 g of freeze-dried sediment sample was weighed in a 20 mL clear-glass headspace vial. 5 mL acetone and 5 mL petroleum ether were added and the vial was closed tightly with a screw cap. The sample was shaken in a horizontal shaker for 30 min at 200 rpm (Swip KS-10, Edmund Bühler GmbH, Bodelshausen, Germany) and then centrifuged for 10 min at 1000 rpm (207.2 g;