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Title: Triclosan and methyl-triclosan dissipation in soils after biosolid application

item LOZANO, N - University Of Maryland
item Rice, Clifford
item RAMIREZ, M - District Of Columbia Water & Sewer Authority (DCWASA)
item TORRENTS, A - University Of Maryland

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 3/22/2010
Publication Date: 4/12/2010
Citation: Lozano, N., Rice, C., Ramirez, M., Torrents, A. 2010. Triclosan and methyl-triclosan dissipation in soils after biosolid application [abstract]. American Chemical Society. 1:11137.

Interpretive Summary: .

Technical Abstract: Triclosan (TCS) is removed in waste water treatment plants (WWTP) primarily as biosolids (approx. 66%). Therefore, biosolids disposal as land applications represents a significant path for release to the environment. Biosolids collected over three years from a large WWTP had concentrations of TCS and methyl-triclosan (MeTCS) ranging from 14.4 to 18.3 and 0.11 to 0.19 ppm, respectively. Multiple, single and zero applications of biosolids were distributed over 26 different commercial farms located in northern Virginia. The earliest applications occurred in 1992 and soils samples were collected within 7 months after application and as long as 14 years after treatment. Data showed that TCS was clearly dissipated from the soils and concentrations were reduced to near-background levels after 16 months. There was evidence of MeTCS formation in these soils. These results were validated in a small control-plot study carried out on farmland near Beltsville, Maryland.