HP6 Emerging Pollutants
202 Oregon Ballroom
1:20 PM - 5:20 PM, Thursday
() Dynamic behaviour of endocrine disrupting chemicals in the aquatic environment.
Liu, R X1, Wilding, A1, Zhou, J L1, 1 University of Sussex, Brighton, East Sussex, UK
ABSTRACT- Endocrine disrupting chemicals (EDCs) are of global concern due to their widespread occurrence, persistence, bioaccumulation and adverse effect on ecosystem and human health. Reliable environmental analysis is a prerequisite for their risk assessment. It is well known that colloids play a vital role in the global carbon as well as the fate and transport of pollutants. This presentation will focus on the determination of phenolic and steroid EDCs in water, sediment and colloidal samples, and development of cross flow filtration (CFF) as a tool for colloid isolation and colloid/pollutant interaction studies. Following extraction of water samples by solid phase extraction, and particulate samples by microwave assisted extraction, the extracts are derivatised by BSTFA and analysed by gas chromatography-mass spectrometry to determine the concentration of EDCs. The two methods have been evaluated thoroughly for quality assurance, and applied to the determination of EDCs in river waters, waste waters and sediments from East and West Sussex, UK. The levels of the target compound are comparable to those reported from other rivers. A 1-kDa CFF was validated with a range of molecular probes of different molecular weight. Results show that good retention of high molecular weight (HMW, >1 kDa) molecules and low retention of low molecular weight (LMW, <1 kDa) molecules can be achieved at high concentration factor values or over long timescales. Mass balance calculations show good recoveries for all of the molecules tested. This method has been successfully applied to the study of colloid/ pollutants interactions. The effects of environmental conditions including colloid and surfactant concentrations on the partition coefficients of EDCs between colloids and dissolved phase are fully assessed.
Key words: CFF, EDCs, Microwave assisted extraction, GC/MS