Method Development for Contaminant Uptake Pathways Using Triclosan and Macroinvertebrates
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Hazael Lopez Zavala, Banni
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Triclosan (TCS) is an antibacterial chemical added to personal care products. Because large quantities of triclosan are produced and subsequently introduced into environmental systems, it is important to understand how it behaves in these systems, including its movement through food webs. Analytical methods were modified to extract triclosan and methyl-triclosan (MTCS) from water and biota samples. A bioaccumulation and biomagnification study was performed, using Chironomus riparius and Aeshnids (Odonata: Aeshnidae). C. riparius was exposed to a controlled amount of triclosan for 20 days and sampled periodically. Aeshnids, in separate aquaria, were fed triclosan-exposed C. riparius concurrently. They were sampled at the completion of the 23 days. Results indicate a decrease in concentration of triclosan in water, no detectable concentrations in biota, having the sand as the major sorption pool. Future work will focus on the improvement of the analytical methods and the transfer of these chemicals into higher trophic levels.
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