Affiliations: Department of Chemistry and Physics and Agricultural Experiment Station, University of the District of Columbia, 4200 Connecticut Avenue, NW, Washington, DC, 20008, USA | Department of Chemistry, The Catholic University of America, Washington, DC, 20064, USA
Abstract: The effects of pH on the speciation of some tributyltin and triphenyltin compounds in spiked sediments from the Anacostia River were studied. The compounds included tributyltin chloride, oxide, and acetate as well as triphenyltin chloride, hydroxide, and acetate. Mössbauer spectroscopy was used to measure the speciation of the triorganotin compounds in the spiked sediments. In general, for the three pHs (5, 7, and 9) studied, the Mössbauer parameters, quadrupole splitting, and isomer shift, varied depending upon the sediment site and the pH. The ρ-values (ratio of quadrupole splitting to isomer shift), which indicate the co-ordination of the tin atom, were greater than 2.1 in all cases, indicating that the co-ordination around the tin atoms in all the spiked sediments is greater than four. The variation in the Mössbauer parameters with pH at different sites in the Anacostia River reflects the variation in the components of the sediments.
Keywords: Anacostia River, Mössbauer spectroscopy, Sediments, Speciation, Tributyltins, Triphenyltins
