Development of a Rapid Method for Po, Th, and U Analysis in Hydraulic - PowerPoint PPT Presentation

Development of a Rapid Method for Po, Th, and U Analysis in Hydraulic Fracturing Flowback Water Andrew Nelson, MS Interdisciplinary Human Toxicology (Schultz Group) University of Iowa, Iowa City

Chemical Matrix Specie Concentration (mg/L) Chloride (Cl) 146667 Strontium (Sr) 36333 Sodium (Na) 29333 Calcium (Ca) 13000 Barium (Ba) 9000 Magnesium (Mg) 853 Potassium (K) 163 Manganese (Mn) 3 Iron (Fe) 43 Lead (Pb) 1 Total Solids (TS) 277666 Total Suspended Solids (TSS) 783 Gasoline 1 Mineral Spirits LOD Kerosene <1 Diesel Fuel 1 Motor Oil LOD Total extractable hydrocarbons (TEH) 2 2

MnO 2 3 ‐ 16 Hours Current 0.5 ‐ 1 Hour TRU Approach 4 Hours Po Slow (Autodeposition) TEVA Total=1 ‐ 2 days 0.5 ‐ 1 Hour 0.5 ‐ 1 Hour U (Ce Hydroxide Th or Ce Fluoride Microprepitation) 3

Faster Approach MnO 2 3 ‐ 16 Hours Total: 4+ hours 4M HCl 0.1M Bioxalate or 0.1M HNO 3 SR Po TEVA 0.1M HCl 0.5 ‐ 1 Hour U TRU 0.1M Bioxalate Th Ce Hydroxide Waste microprecipiation 15 ‐ 30 min 4

Polonium Recovery ≥ 100% Po ‐ 210 0.1M Bioxalate or Po ‐ 209 0.1M HNO 3 SR Po Po ‐ 212 Th daughters? Bi ‐ 212 5

Uranium Recovery ≈ 13% TEVA 0.1M HCl U U ‐ 232 6

Thorium Recovery ≈ 85 % Th ‐ 228 TRU 0.1M Bioxalate Th Th ‐ 230 Th ‐ 228 daughters 7

Discussion • Reconsider preconcentration technique? • Uranium recovery from matrix interference? • Carbonates? • Is there a more robust resin for U, Th, Po? – Improve resolution of Ce(OH) 3 precip for Po? 8

Thank You! • State Hygienic Laboratory at UIowa – Marinea Mehrhoff – Dustin May • University of Iowa – Dr. Michael K Schultz – Eric Eitrheim – Andrew Knight • Environmental Management Solutions – Robert Shannon – Dr. Robert Litman 9