The long term objective of this proposal is to develop a quantitative means for predicting the delivery of semivolatile organic contaminants from hazardous waste sites via nearby streams. To model the exchange of such chemicals between the stream water and the immobile bed sediments. It is proposed that measuring the penetration of excess Th234 and Pb210 into the bed of a stream will reveal the depth of sediment which is in contact with the overlying flow on time scales of weeks (Th234) and which is accumulating over decades (Pb210). Coupling this knowledge with the sorption and diffusion behavior of toxic organic chemicals will enable modeling bedstream exchange. By performing a series of mass balance studies on a particular stream system (the East Drainage Ditch/Aberjona River passing two Superfund Sites in Woburn, MA), the researchers expect to see whether chemical degradation processes are necessary to close the mass balances for (a) short term field studies at different stream reaches and occurring at different seasons, and (b) a longer term monitoring spread over several years. Should """"""""sinks"""""""" be needed for particular semivolatiles to explain the field data, they will apply some """"""""probe"""""""" compounds to the stream in an effort to calibrate that site for certain photochemical (e.g., 2,5- dimethyl furan to assess the abundance of the transient oxidant, singlet oxygen) and biochemical processes (e.g., toluene to assess microbial oxidase activity).

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Senn, David B; Gawel, James E; Jay, Jennifer A et al. (2007) Long-term fate of a pulse arsenic input to a eutrophic lake. Environ Sci Technol 41:3062-8
Diez, Sergi; Noonan, Gregory O; MacFarlane, John K et al. (2007) Ferrous iron oxidation rates in the pycnocline of a permanently stratified lake. Chemosphere 66:1561-70
Risoul, Veronique; Richter, Henning; Lafleur, Arthur L et al. (2005) Effects of temperature and soil components on emissions from pyrolysis of pyrene-contaminated soil. J Hazard Mater 126:128-40
Coller, Hilary A; Khrapko, Konstantin; Herrero-Jimenez, Pablo et al. (2005) Clustering of mutant mitochondrial DNA copies suggests stem cells are common in human bronchial epithelium. Mutat Res 578:256-71
Pedersen, Daniel U; Durant, John L; Taghizadeh, Koli et al. (2005) Human cell mutagens in respirable airborne particles from the northeastern United States. 2. Quantification of mutagens and other organic compounds. Environ Sci Technol 39:9547-60
Durant, John L; Ivushkina, Tatiana; MacLaughlin, Kathy et al. (2004) Elevated levels of arsenic in the sediments of an urban pond: sources, distribution and water quality impacts. Water Res 38:2989-3000
Blute, Nicole Keon; Brabander, Daniel J; Hemond, Harold F et al. (2004) Arsenic sequestration by ferric iron plaque on cattail roots. Environ Sci Technol 38:6074-7
Pedersen, Daniel U; Durant, John L; Penman, Bruce W et al. (2004) Human-cell mutagens in respirable airborne particles in the northeastern United States. 1. Mutagenicity of fractionated samples. Environ Sci Technol 38:682-9
Southworth, Barbara A; Voelker, Bettina M (2003) Hydroxyl radical production via the photo-Fenton reaction in the presence of fulvic acid. Environ Sci Technol 37:1130-6
Tomita-Mitchell, Aoy; Ling, Losee Lucy; Glover, Curtis L et al. (2003) The mutational spectrum of the HPRT gene from human T cells in vivo shares a significant concordant set of hot spots with MNNG-treated human cells. Cancer Res 63:5793-8

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