Overall this study improved delineation of DDT hot spots and narrowed the half-life ranges of DDT and its metabolites in PPNP. It was determined that the highest concentrations of DDT (not including DDT’s derivatives) could remain above federal guidelines for a further 220–342 yr. Dichlorodiphenyltrichloroethane isomer analysis compared groupings of samples and determined that soil hot spot areas have half-lives ranging from 27 to 40 yr. This information was mapped into an interactive Google Earth platform. Dichlorodiphenyltrichloroethane contamination boundaries were defined, and they were determined that this contaminant occurs predominantly in three “hot spot” areas with total DDT levels exceeding 130 000 ng g -1, which is 19 000% higher than federal guidelines. In total, 140 soil, nine sediment, and four water samples were analyzed by gas chromatography/electron capture detection. Cesium Cs 137 is prevalent due to its spontaneous production, which occurs as a result of nuclear fission of other radioactive materials, such as uranium and plutonium.This radionuclide has a relatively long half-life, 30 years, and decays by emitting beta particles. Building on previous research, a comprehensive soil and sediment sampling, and analytical program was carried out over several years and was completed in 2014. Cesium Cs 137 is a radioactive isotope of cesium with an atomic mass of 139 and potential application in radiotherapy. This study was designed to update and enhance information that will advise PPNP personnel on remediation strategies. Point Pelee National Park (PPNP), located in Leamington, ON, is heavily contaminated with the pesticide dichlorodiphenyltrichloroethane (DDT) that was liberally used for mosquito and pest control in the park from the 1940s until the 1960s.
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