Zobrazeno 1 - 10
of 19
pro vyhledávání: '"Jason D, Demers"'
Publikováno v:
Analytical and Bioanalytical Chemistry. 415:759-774
Publikováno v:
Analytical and bioanalytical chemistry.
Isotope ratios of methylmercury (MeHg) within organisms can be used to identify sources of MeHg that have accumulated in food webs, but these isotopic compositions are masked in organisms at lower trophic levels by the presence of inorganic mercury (
Publikováno v:
Environmental science. Processesimpacts. 23(5)
The goal of this project was to assess how anthropogenic legacy mercury (Hg) retained in streambed sediment may be remobilized to stream water. To do this, we performed sequential extractions and Hg isotope analyses on streambed sediment collected al
Autor:
Ami L. Riscassi, Jason D. Demers, Daniel L. Druckenbrod, T. D. Camper, Temple R. Lee, Todd M. Scanlon
Publikováno v:
Journal of Geophysical Research: Biogeosciences. 125
Autor:
James B. Shanley, Bradley D. Blackwell, Mario Montesdeoca, Charles T. Driscoll, Jacqueline R. Gerson, Jason D. Demers, Donald S. Ross, Amy K. Sauer
Publikováno v:
Journal of Geophysical Research: Biogeosciences. 122:1922-1939
Global mercury contamination largely results from direct primary atmospheric and secondary legacy emissions, which can be deposited to ecosystems, converted to methylmercury, and bioaccumulated along food chains. We examined organic horizon soil samp
Autor:
Baohua Gu, Bridget A. Bergquist, Xia Lu, Ariel D. Anbar, Wang Zheng, Joel D. Blum, Jason D. Demers
Publikováno v:
Environmental sciencetechnology. 53(4)
Mercury (Hg) stable isotope fractionation has been widely used to trace Hg sources and transformations in the environment, although many important fractionation processes remain unknown. Here, we describe Hg isotope fractionation during the abiotic d
Publikováno v:
Science of The Total Environment. 762:144022
Tree ring records are increasingly being used as a geochemical archive of past atmospheric mercury (Hg) pollution. However, it is not clear whether all tree species can be used reliably for this purpose. We compared tree-ring Hg records of two conife
Publikováno v:
Global Biogeochemical Cycles. 29:1689-1705
Identifying the anthropogenic and natural sources of mercury (Hg) emissions contributing to atmospheric mercury on local, regional, and global scales continues to be a grand challenge. The relative importance of various direct anthropogenic emissions
Publikováno v:
Environmental sciencetechnology. 51(19)
Historic point source mercury (Hg) contamination from industrial processes on the South River (Waynesboro, Virginia) ended decades ago, but elevated Hg concentrations persist in the river system. In an effort to better understand Hg sources, mobility
Publikováno v:
Environmental Science & Technology. 48:3666-3674
Sediments were analyzed for total Hg concentration (THg) and isotopic composition from streams and rivers in the vicinity of the Y-12 National Security Complex (Y12) in Oak Ridge, TN (USA). In the stream directly draining Y12, where industrial releas