Dr. Anniet Laverman
Directrice de recherche
Ecobio – Ecosystèmes, Biodiversité, Evolution
Centre national de la recherche scientifique – CNRS
Université de Rennes 1
Rennes, France
Fate and transport of tetracycline and ciprofloxacin and impact on nitrate reduction activity in coastal sediments
Thursday, April 13
2:00 pm - DC 1302
Fluoroquinolones and tetracyclines are frequently detected antibiotics in aquatic sediments. We investigated the transport and fate of ciprofloxacin (CIP) and tetracycline (TC) as well as their impact on nitrogen transformations in sediments from the Seine Estuary (France). Flow-through reactor (FTR) experiments showed that although TC and CIP strongly interacted with the sediment components through adsorption and (bio)-chemical transformation, they kept their antimicrobial activities. Less nitrate reduction was observed during the first week of the experiment, while TC and CIP were absent in the FTR effluent. Whereas TC was to a large extent chemically transformed and little adsorbed in the sediment, CIP was less transformed and more adsorbed, most likely due to the great reactivity of TC toward redox-active mineral surfaces. Our findings show the strong capacity of natural sediments to retain and transform antibiotics, while still maintaining their inhibitory activity on nitrate reducing activity.
Everyone welcome
Coffee provided