tailieunhanh - Lead geochemistry of sediments in Galveston Bay, Texas

The geochemical behavior of Pb in terrestrial and coastal water systems significantly influences Pb biogeochemical cycling and pollutant exchange at the land-sea continuum. An ideal case study of Pb environmental geochemistry is Galveston Bay, an anthropogenic estuary exposed to industrial runoff, wastewater and shipping vessel spills but also fed by natural rivers. | Environmental Advances 4 2021 100057 Contents lists available at ScienceDirect Environmental Advances journal homepage locate envadv Lead geochemistry of sediments in Galveston Bay Texas Amanda M. Lopez a Alan D. Brandon a Frank C. Ramos b Jessica N. Fitzsimmons c Timothy M. Dellapenna d Hannah M. Adams c a 3507 Cullen Boulevard Room 312 Department of Earth and Atmospheric Sciences University of Houston Houston TX 77004 USA b 1255 N. Horseshoe Drive MSC3AB Department of Geological Sciences New Mexico State University Las Cruces NM 88003 USA c 3146 TAMU O amp M 403A Department of Oceanography Texas A amp M University College Station TX 77843 USA d 1001 Texas Clipper Rd Bldg 3029 Office 341 Department of Marine Sciences Department of Oceanography Texas A amp M University at Galveston Galveston TX 77553 USA a r t i c l e i n f o a b s t r a c t Keywords The geochemical behavior of Pb in terrestrial and coastal water systems significantly influences Pb biogeochemi- Marine biogeochemistry cal cycling and pollutant exchange at the land-sea continuum. An ideal case study of Pb environmental geochem- Lead isotope fingerprinting istry is Galveston Bay an anthropogenic estuary exposed to industrial runoff wastewater and shipping vessel spills but also fed by natural rivers. Here sediments from Galveston Bay were measured for Pb isotope ratios and abundances to constrain Pb sources and fluxes and understand Pb pollution history in the bay. Lead isotopes have been established as source tracers of environmental pollution and allow Pb sources to be reliably fingerprinted and identified. Sediments were leached to distinguish authigenic sediment coatings from lithogenic residual sedi- ments in addition to bulk sediment digestions. Total Pb concentrations ranged from μg g μg g in bulk digests which are below federal toxicity thresholds and aligns well with prior measurements of Pb in Galveston Bay sediments in the 20th century. Lead concentrations are spatially

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