Airborne Lead Arsenic in Hayden AZ REMAN ALMUSAWI

Airborne Lead & Arsenic in Hayden, AZ REMAN ALMUSAWI ARIZONA SPACE GRANT – 2020 SYMPOSIUM Acknowledgements: Dr. A. E. Sáez, Dr. E. A. Betterton, T. Rodriguez-Chavez, K. P. Rine, R. F. O’Brien-Metzger

A. CRUSHING & GRINDING C. SLAG DUMPS Introduction 2008 • ASARCO installed controls on refining operation - overall lead emissions reduced by 50% • Mandatory cleanups B. SMELTING D. WIND EROSION OF MINE TAILINGS 2014 • Nonattainment designation by EPA for airborne lead 2015 • $150 million settlement between US EPA and ASARCO LLC • ASARCO mandated to install new equipment & pollution control technologies Source: Modified from (Csavina et al. , 2012)

Study Site Hayden High School

Materials & Methods o Inverted-disc samplers were o 22 Inverted-Disc Samplers installed at Hayden High School o Diameter: 24 cm o Surface area : 0. 045 m 2 First Pass Second Pass Third Pass Source: superfund. arizona. edu/personnel/trainees/tania-b-rodriguez o 11 Surface wipe Samples o Template surface area : 0. 03 m 2 Sample Preparation Laboratory Analysis o Extractions with 40 m. L of Aqua Regia o Aliquot of 3. 6 ml were diluted to 12 ml of D. I water o Samples were analyzed by The Arizona Laboratory for Emerging Contaminants (ALEC)

Source: superfund. arizona. edu/personnel/trainees/tania-b-rodriguez

Results: Inverted Disk Samplers Lead deposition fluxes (μg/m 2 day) Inverted-disc samplers (2/11/2019, 112 days) Dust Lead (μg/m 2) 1000 10 1 Inverted-disc samplers (2/11/2019, 112 days) 4 3. 5 3 2. 5 2 1. 5 1 0. 5 0 MOUDI Room Library Wolf Case Class Room West Wall 1306 1304 Source from T. Rodriguez; unpublished data Art Lab Admi Roof MOUDI Room Library Wolf Case Class Room West Wall 1306 1304 Art Lab Admi Roof

Results: Surface Dust Sample Collected: 1/17/2019 1000 Dust Arsenic ( μg/m 2) Dust Lead ( μg/m 2) 10000 100 10 10 Bookshelf RM 1304 Locker # 1 EPA Dust-Lead Hazard (Floors) (108 μg/m 2) Source from T. Rodriguez; unpublished data Floor G Computer Window S. Library BS Book EPA Dust-Lead Hazard (Window Sill)(1076 μg/m 2) 1 Bookshelf RM 1304 Locker # 1 Floor G Computer Window S. Library BS Book

Conclusions Lead particles make it into the indoor environments settling with dust Previous studies show indoor particles to contain relatively elevated concentrations of lead. Lead Dust > 108 μg/m 2 EPA Dust-Lead Hazard Standard was violated

Dr. Eduardo Sáez Dr. Eric Betterton Kyle Rine Ruby O’Brien-Metzger Tania Rodriguez-Chavez Michelle Coe Thank You

References Csavina, J. , Field, J. , Taylor, M. P. , Gao, S. , Landazuri, A. , Betterton, E. A. , & Sáez, A. E. (2012). A review on the importance of metals and metalloids in atmospheric dust and aerosol from mining operations. Science of the Total Environment, 433, 58 -73.