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Metals Speciation as a Tool for Addressing Environmental Issues

Metals Speciation as a Tool for Addressing Environmental Issues

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Metals Speciation as a Tool for Addressing Environmental Issues

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  1. Metals Speciation as a Tool for Addressing Environmental Issues Michelle Briscoe President/CEO, Brooks Rand Labs michelle@brooksrand.com Presented at the DOECAP ASP Workshop, Albuquerque, NM, September 17, 2014

  2. Brooks Rand Labs Specialty Trace Metals Analytical Laboratory Performing Metals Speciation Analyses since 1988! • DOECAP Audited Lab • DoD Accredited • NELAC Accredited • ISO 17025 Accredited Certified Small Business located in Seattle, Washington

  3. Scope of Services Niche services exclusively for metals analyses

  4. Scope of Services Niche services exclusively for metals analyses

  5. Commonly Speciated Metals at Brooks Rand Labs Arsenic – As(III), As(V), MMAs, DMAs, AsB Mercury – MeHg, Inorganic Hg (Hg2+), EtHg, Fractionation in Soils/Sediments Selenium – Se(IV), Se(VI), SeCN, SeMet, MeSe Chromium – Cr(III), Cr(VI) Iron – Fe(II), Fe(III) Manganese – Mn(II), Mn(IV)

  6. Common Speciated Metals Arsenic – As(III), As(V), MMAs, DMAs, AsB Mercury – MeHg, Inorganic Hg (Hg2+), EtHg, Fractionation in Soils/Sediments Selenium – Se(IV), Se(VI), SeCN, SeMet, MeSe Chromium – Cr(III), Cr(VI) Iron – Fe(II), Fe(III) Manganese – Mn(II), Mn(IV)

  7. Metals Speciation Tools to Support a Wide Variety of Project Types

  8. Case Study: Arsenic Speciation for Wastewater Treatment at Landfill Gas Power Plant

  9. Typical Landfill Gas Power Plant Courtesy City of Vancouver BC

  10. Problem: High Arsenic in Wastewater from Landfill Gas Power Plant • Background: • Wastewater from a landfill gas electric power plant in New England was very high in arsenic (~1500 μg/L) • Arsenic levels were not reduced through standard wastewater treatment technologies

  11. Total Arsenic Analysis

  12. Arsenic Speciation Analysis

  13. Arsenic Speciation Surface Water, Ground Water, Seawater • Total As, Inorganic As, Organic As, As(III), As(V), MMAs, and DMAs Soils/Sediment • All of the Above Animal Tissues/Plants/Biomonitoring/Food • All of the Above plus Arsenobetaine (AsB)

  14. EPA Method 1632A Manual Analysis for Arsenic Speciation 120 °C 20 mL

  15. IC-ICP-MS Automated Analysis for Arsenic Speciation Source: www.speciation.net

  16. IC-ICP-MS Chromatogram MMAs DMAs As(III) As(V)

  17. Case Study: Mercury Speciation for Source Identification

  18. USGS Study of High Mercury Levels in Coastal Redwood Streams [1] [1] Rytuba (2014), Goldschmidt Conference Presentation [2] Weiss-Penzias et al (2012) Geophys Res Letters, 39, L03804, 1-5. 1/3 of water from summer fog MeHg in coastal redwood needles is significantlyhigher than needles from Evergreens that don’t receive coastal fog MeHg in Fog 10 ng/L (Rain ≈ 0.2 ng/L) [2]

  19. Rytuba (2014), Goldschmidt Conference Presentation

  20. USGS Study of High Mercury Levels in Coastal Redwood Streams MeHg in Streams (low-flow): Normal MeHg retained by needles MeHg in Streams (high-flow): Elevated High soil (TSS) content, soils high in MeHg due to decomposition of needles

  21. Mercury Speciation All Methods are CV-AFS Surface Water, Ground Water, Seawater • Total Hg, MeHg, Hg(II)/Acid-Labile, Hg(0) Tissues/Biota/Biomonitoring/Food • Total Hg, MeHg, EtHg Air/Natural Gas • Total Hg, Particulate Hg, Gaseous Hg Soils/Sediment • Total Hg, MeHg, Hg(0), 5-Step SSE Procedure

  22. 5-Step SSE Sample Preparation

  23. Mercury Speciation in Soils “5-Step” Selective Sequential Extraction Procedure

  24. Case Study: Mercury Speciation for Stabilization Treatment Optimization

  25. Treatment of Oak Ridge Y-12 Site Soils All samples were “spiked” with 10,000 mg/kg Hg(0)

  26. Case Study: Selenium Speciation for Wastewater Treatment Optimization

  27. Coal-Fired Power Plant with Flue Gas Desulfurization (FGD)

  28. Se(IV) →

  29. Se(IV) → Se(IV) → Se(VI)?

  30. Standard chemical treatments remove Se(IV), but not Se(VI) More costly bioreactors are efficient at removing Se(VI) Se(IV) → Se(IV) → Se(VI)?

  31. Treatment of FGD Wastewater for Selenium Removal Understanding the selenium speciation at each step in the FGD wastewater generation process saves time and money in engineering the optimal treatment technologies

  32. Selenium Speciation Surface Water, Ground Water, Wastewater • Total Se • Inorganic Se, Organic Se • Selenite {Se(IV)} • Selenate {Se(VI)} • Selenocynate (SeCN) • Selenomethionine (SeMet) • Methylseleninic Acid (MeSe)

  33. Selenium Speciation BRL SOP BR-0061 (IC-ICP-DRC-MS)

  34. Metals Speciation… A powerful tool to help address metals-related environmental issues

  35. Thank You! Questions? Contact Info: Michelle Briscoe michelle@brooksrand.com