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Seasonal Cycling of Redox Active Metal(loid) Contaminants within a Mine Waste Impacted Wetland Matthew La Force University of Idaho

pH and Eh Sampler 5-cm PVC Rod 5-cm 70 cm 20 mL Tubes 20 mL Tubes Element Sampler 2-cm 40 cm 5 mL Tubes 5 mL Tubes 2.5-cm PVC Rod Water Sediment Peeper Designs

Vacuum Gauge Vacuum Pump Battery 12-V N (2) gas 3-Way Ball Valve 45 cm 25 cm Sample Transporter

Sampling Devices

Site 5 Site 10 Site 15

60 m Site 5 Site 10 Site 15 Xanes Area Data Logger 100 cm Sampling Sites

Temperature vs. Water Depth Temp o C Temp o C Depth (cm) Depth (cm) Temp. Site 5 Site 10 Site Mar May Jul Sept Nov Jan

Sodium Acetate/Acetic Acid Carbonates Sodium Acetate/Acetic Acid Carbonates % As % Fe 20 Fe As Mar May Jul Sept Nov Jan Site 15

Melton Valley A Horizon PBET Extractions Days after soil spiking Percent Extracted Arsenic Chromium Lead

Melton Valley A Horizon PBET Extractions Days after soil spiking Percent Extracted Arsenic Chromium Lead As

Magnesium Chloride (Exchangeable) 2/1/98 4/1/98 6/1/98 8/1/98 10/1/98 12/1/98 2/1/ Site 5 Site 10 Site 15 Month % Mn

As III - As V - As 2 S 3 As MnCO 3 Mn Mn (hydr)oxide Mn Silicate Mn Silicate Fe-As Silicate Fe-As Silicate

10 mL of 1 M MgSO pH 7, 1 h Exchangeable 20 mL of 0.2 M pH 3, 3 h Noncrystalline Materials Fe-hydroxides 20 mL of 0.2 M pH 3, 3 h Noncrystalline Materials Fe-hydroxides 30 mL of 12 N HCl, 12 h Reactive/Crystalline Materials 30 mL of 12 N HCl, 12 h Reactive/Crystalline Materials Homogenized X 5 Microwave Digestion – Hydrofluoric-Nitric-Hydrochloric Acid (Residual or Silicates) As + Cr + Pb “Clean” Melton Valley A or B Field Capacity “Clean” Melton Valley A or B Field Capacity 5 5 mg L -1

v 96 o F 50 mL 1 M Glycine 0.5 g soil Drill- 12 RPM 1 hr 10 Gallon Tank Wood Stand