Review of Chromium Speciation Research. Research Project: Assessing the Impact of Chromium in the Environment Assessing the Impact of Chromium in the.

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Speciation of Chromium. Research Project: Assessing the Impact of Chromium in the Environment Funding provided by Florida Department of Environmental.

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Presentation transcript:

Review of Chromium Speciation Research

Research Project: Assessing the Impact of Chromium in the Environment Assessing the Impact of Chromium in the Environment Funding provided by the Florida Department of Environmental Protection RCRA Program

Chromium Exists as Several Chemical Species Most common oxidation states: 0, +3, +6 0: Elemental Chromium (Cr) +3: Trivalent Chromium Species: Cr +3, Cr 2 O 3 +6: Hexavalent Chromium Species: CrO 4 2-, Cr 2 O 7 -

Chromium Speciation Important! The characteristics and properties of trivalent chromium and hexavalent chromium are greatly different. Cr(VI) is much more toxic and mobile than Cr(III)

pH Cr 2 O 3 CrO 4 2- Cr 2 O 7 - Cr 3+ Eh (volts) Chromium Eh-pH Diagram

Fate of Chromium in CCA- Treatment Process –CrAsO 4 –Cu(OH)CrAsO 4 –CuCrO 4 –Cr(OH) 3 –Cr 6+ /wood complexes –Cr 3+ /wood complexes –Cu 2+ /wood complexes CrO 3 CuO As 2 O 5 Treating SolutionTreated Wood Cr +6 Cr +3

Research Objective Examine the fate and behavior of hexavalent chromium in various environmental media impacted by CCA

0.0 mg Cr +6 /l0.3 mg Cr +6 /l0.6 mg Cr +6 /l

Alkaline Digestion SW-846 Method 3060A

IC System Detector Integrator Analytical Column Guard Column LC Pump

Experiment 1 Examination of the fate of hexavalent chromium in soils spiked with CCA solution Cr(VI)/Cr(total) concentrations were measured over time Leachable Cr(VI) and Cr(III) concentrations measured over time (SPLP)

Soil Types

Reduction in Total Cr+6 with Time

Experiment 2 How Much CrVI is in CCA-Treated Wood

Results Alkaline digestions on CCA-treated wood samples show Cr +6 concentrations in the range 7 to 250 mg/kg (less 3% of all Chromium) SPLP leachates have no detectable Cr +6 concentrations

Experiment 3 Under what leaching conditions would Cr +6 form?

Chromium Leachability as a Function of Time (weathered wood sample)

TCLP & SPLP MSW Landfill Leachate Alkaline Leachate

Experiment 4 Will Cr +6 be formed in simulated alkaline leachate? Scenario: saturated concrete

Chromium Leaching in Concrete Leachate

Experiment 5 Is Cr +6 formed during combustion of CCA-treated wood?