title: Investigation of Total and Hexavalent Chromium in Filtered and Unfiltered Groundwater Samples at the Tucson International Airport Superfund Site.
abstract: Potential health effects from hexavalent chromium in groundwater have recently become a concern to regulators at the Tucson International Airport Area Superfund site. In 2016, the U.S. Geological Survey sampled 46 wells in the area to characterize the nature and extent of chromium in groundwater, to understand what proportion of total chromium is in the hexavalent state, and to determine if substantial differences are present between filtered and unfiltered chromium concentrations. Results indicate detectable chromium concentrations in all wells, over 75 % of total chromium is in the hexavalent state in a majority of wells, and filtered and unfiltered results differ substantially in only a few high-turbidity total chromium samples.
authors.affiliation: Arizona Water Science Center, U.S. Geological Survey, 520 N. Park Ave., Tucson, AZ, 85719, USA. ftillman@usgs.gov.
authors.forename: Fred D
authors.initials: FD
authors.lastname: Tillman
authors.affiliation: National Research Program, U.S. Geological Survey, 3215 Marine St., Boulder, CO, 80303, USA.
authors.forename: R Blaine
authors.initials: RB
authors.lastname: McCleskey
authors.affiliation: Arizona Water Science Center, U.S. Geological Survey, 520 N. Park Ave., Tucson, AZ, 85719, USA.
authors.forename: Edyth
authors.initials: E
authors.lastname: Hermosillo
mesh_terms: D059028:Airports; D001130:Arizona; D002857:Chromium / Q000032:analysis*; D004784:Environmental Monitoring; D060587:Groundwater / Q000737:chemistry*; D014481:United States; D014874:Water Pollutants, Chemical / Q000032:analysis
chemical_list: D014874:Water Pollutants, Chemical; D002857:Chromium; C074702:chromium hexavalent ion
keywords: Groundwater contamination; Hexavalent chromium; Water quality; Wells