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Aurell J, Holder AL, Gullett BK, Sowers TD, Weinstein J, Kariher P, McNesby K, Kim YH, Gilmour MI. Gas and particle emissions from rifle and pistol firing. JOURNAL OF HAZARDOUS MATERIALS 2024; 476:135196. [PMID: 39018594 DOI: 10.1016/j.jhazmat.2024.135196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2024] [Revised: 07/10/2024] [Accepted: 07/11/2024] [Indexed: 07/19/2024]
Abstract
Emissions were sampled from firing an M4 carbine rifle and a M9 (military issue of Beretta 75 FS 9 mm pistol) to develop sampling methods and assess potential exposures and range contamination issues. Breech and muzzle emissions were sampled from the rifle when firing M855A1 ammunition (lead (Pb)-free slugs) in single- and triple-shot burst mode and from single pistol shots when firing 9 mm XM1152 ammunition (not Pb-free). Emissions were sampled for carbon monoxide (CO), carbon dioxide (CO2), methane, hydrogen cyanide, ammonia, particulate matter by size, polycylic aromatic hydrocarbons, and volatile organics. Analyses on the particles included elemental composition, size distribution, carbon composition (black, total, organic, and elemental carbon), and particle composition and morphology. Emission concentrations from both the rifle and pistol were characterized by CO/CO2 ratios between, approximately, 1/1 and 2/1, respectfully, indicating incomplete carbon oxidation. The initial particle size distribution was dominated in number by particles smaller than 40 nm but the high particle concentrations led to rapid agglomeration. The abundance of CO and metals of inhalable particle size are noteworthy and indicate that further assessment of exposure would determine potential inhalation health hazards, particularly in indoor firing ranges.
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Affiliation(s)
- Johanna Aurell
- US Environmental Protection Agency, Office of Research and Development, Center for Environmental Measurement and Modeling (E343-04), Research Triangle Park, NC 27711, USA.
| | - Amara L Holder
- US Environmental Protection Agency, Office of Research and Development, Center for Environmental Measurement and Modeling (E343-04), Research Triangle Park, NC 27711, USA
| | - Brian K Gullett
- US Environmental Protection Agency, Office of Research and Development, Center for Environmental Measurement and Modeling (E343-04), Research Triangle Park, NC 27711, USA
| | - Tyler D Sowers
- US Environmental Protection Agency, Office of Research and Development, Center for Environmental Measurement and Modeling (E343-04), Research Triangle Park, NC 27711, USA
| | - Jason Weinstein
- US Environmental Protection Agency, Office of Research and Development, Center for Public Health and Environmental Assessment, Research Triangle Park, NC 27711, USA
| | - Peter Kariher
- US Environmental Protection Agency, Office of Research and Development, Center for Environmental Measurement and Modeling (E343-04), Research Triangle Park, NC 27711, USA
| | - Kevin McNesby
- US Army Research Laboratory, 2800 Powder Mill Rd, Adelphi, MD 20783, USA
| | - Yong Ho Kim
- US Environmental Protection Agency, Office of Research and Development, Center for Public Health and Environmental Assessment, Research Triangle Park, NC 27711, USA
| | - M Ian Gilmour
- US Environmental Protection Agency, Office of Research and Development, Center for Public Health and Environmental Assessment, Research Triangle Park, NC 27711, USA
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2
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Wielinski J, Huang X, Lowry GV. Characterizing the Stoichiometry of Individual Metal Sulfide and Phosphate Colloids in Soils, Sediments, and Industrial Processes by Inductively Coupled Plasma Time-of-Flight Mass Spectrometry. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2024; 58:12113-12122. [PMID: 38917351 PMCID: PMC11238586 DOI: 10.1021/acs.est.3c10186] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Revised: 06/08/2024] [Accepted: 06/11/2024] [Indexed: 06/27/2024]
Abstract
Size and purity of metal phosphate and metal sulfide colloids can control the solubility, persistence, and bioavailability of metals in environmental systems. Despite their importance, methods for detecting and characterizing the diversity in the elemental composition of these colloids in complex matrices are missing. Here, we develop a single-particle inductively coupled plasma time-of-flight mass spectrometry (sp-icpTOF-MS) approach to characterize the elemental compositions of individual metal phosphate and sulfide colloids extracted from complex matrices. The stoichiometry was accurately determined for particles of known composition with an equivalent spherical diameter of ≥∼200 nm. Assisted by machine learning (ML), the new method could distinguish particles of the copper sulfides covellite (CuS), chalcocite (Cu2S), and chalcopyrite particles (CuFeS2) with 75% (for Cu2S) to 99% (for CuFeS2) accuracy. Application of the sp-icpTOF-MS method to particles recovered from natural samples revealed that iron sulfide (FeS) particles in lake sediment contained ∼4% copper and zinc impurities, whereas pure pyrite (FeS2) was identified in hydraulic fracturing wastewater and confirmed by selected area electron diffraction. Colloidal mercury in an offshore marine sediment was present as pure mercury sulfide (HgS), whereas geogenic HgS recovered from an industrial process contained ∼0.08 wt % silver per Hg, enabling source apportionment of these colloids using ML. X-ray absorption spectroscopy confirmed that Hg was predominantly present as metacinnabar (β-HgS) in the industrial process sample. The determination of impurities in individual colloids, such as zinc and copper in FeS, and silver in HgS may enable improved assessment of their origin, reactivity, and bioavailability potential.
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Affiliation(s)
- Jonas Wielinski
- Department of Civil and Environmental
Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
| | - Xiaopeng Huang
- Department of Civil and Environmental
Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
| | - Gregory V. Lowry
- Department of Civil and Environmental
Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
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3
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Sowers TD, Nelson CM, Blackmon MD, Li K, Jerden ML, Kirby AM, Kovalcik K, Cox D, Dewalt G, Friedman W, Pinzer EA, Ashley PJ, Bradham KD. United States house dust Pb concentrations are influenced by soil, paint, and house age: insights from a national survey. JOURNAL OF EXPOSURE SCIENCE & ENVIRONMENTAL EPIDEMIOLOGY 2024; 34:709-717. [PMID: 38548929 PMCID: PMC11303246 DOI: 10.1038/s41370-024-00655-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2023] [Revised: 02/08/2024] [Accepted: 02/13/2024] [Indexed: 08/09/2024]
Abstract
BACKGROUND Lead (Pb) in house dust contributes significantly to blood lead levels (BLLs) in children which may result in dire health consequences. Assessment of house dust Pb in the United States, relationships with Pb in soil and paint, and residential factors influencing Pb concentrations are essential to probing drivers of house dust Pb exposure. OBJECTIVE Pb concentrations in vacuum-collected house dust are characterized across 346 homes participating in the American Health Homes Survey II (AHHS II), a US survey (2018-2019) evaluating residential Pb hazards. Connections between house dust Pb and soil Pb, paint Pb, and other residential factors are evaluated, and dust Pb concentration data are compared to paired loading data to understand Pb hazard standard implications. RESULTS Mean and median vacuum dust Pb concentrations were 124 µg Pb g-1 and 34 µg Pb g-1, respectively. Vacuum-collected dust concentrations and dust wipe Pb loading rates were significantly correlated within homes (α < 0.001; r ≥ 0.4). At least one wipe sample exceeded current house dust Pb loading hazard standards (10 µg ft-2 or 100 µg Pb ft-2 for floors and windowsills, respectively) in 75 of 346 homes (22%). House dust Pb concentrations were correlated with soil Pb (r = 0.64) and Pb paint (r = 0.57). Soil Pb and paint Pb were also correlated (r = 0.6). IMPACT The AHHS II provides a window into the current state of Pb in and around residences. We evaluated the relationship between house dust Pb concentrations and two common residential Pb sources: soil and Pb-based paint. Here, we identify relationships between Pb concentrations from vacuum-collected dust and paired Pb wipe loading data, enabling dust Pb concentrations to be evaluated in the context of hazard standards. This relationship, along with direct ties to Pb in soil and interior/exterior paint, provides a comprehensive assessment of dust Pb for US homes, crucial for formulating effective strategies to mitigate Pb exposure risks in households.
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Affiliation(s)
- Tyler D Sowers
- Center of Environmental Measurement and Modeling, Office of Research and Development, US Environmental Protection Agency, Research Triangle Park, NC, 27711, USA.
| | | | - Matthew D Blackmon
- Center of Environmental Measurement and Modeling, Office of Research and Development, US Environmental Protection Agency, Research Triangle Park, NC, 27711, USA
| | - Kevin Li
- Independent Researcher, Lansing, MI, 48915, USA
| | - Marissa L Jerden
- Jacobs Technology, Inc., 109 T.W. Alexander Drive, Research Triangle Park, NC, 27711, USA
| | - Alicia M Kirby
- Oak Ridge Associated Universities, Oak Ridge, TN, 37830, USA
| | - Kasey Kovalcik
- Center of Environmental Measurement and Modeling, Office of Research and Development, US Environmental Protection Agency, Research Triangle Park, NC, 27711, USA
| | - David Cox
- QuanTech, 6110 Executive Blvd Suite 206, Rockville, MD, 20852, USA
| | - Gary Dewalt
- QuanTech, 6110 Executive Blvd Suite 206, Rockville, MD, 20852, USA
| | - Warren Friedman
- Office of Lead Hazard Control and Healthy Homes, Department of Housing and Urban Development, Washington, DC, 20410, USA
| | - Eugene A Pinzer
- Office of Lead Hazard Control and Healthy Homes, Department of Housing and Urban Development, Washington, DC, 20410, USA
| | - Peter J Ashley
- Office of Lead Hazard Control and Healthy Homes, Department of Housing and Urban Development, Washington, DC, 20410, USA
| | - Karen D Bradham
- Center of Environmental Measurement and Modeling, Office of Research and Development, US Environmental Protection Agency, Research Triangle Park, NC, 27711, USA
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Sowers TD, Blackmon MD, Wilkin RT, Rovero M, Bone SE, Jerden ML, Nelson CM, Bradham KD. Lead Speciation, Bioaccessibility, and Sources for a Contaminated Subset of House Dust and Soils Collected from Similar United States Residences. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2024; 58:9339-9349. [PMID: 38748567 DOI: 10.1021/acs.est.4c01594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2024]
Abstract
Residential lead (Pb) exposure is of critical concern to families globally as Pb promotes severe neurological effects in children, especially those less than 5 years old, and no blood lead level is deemed safe by the US Center for Disease Control. House dust and soils are commonly thought to be important sources of Pb exposure. Probing the relationship between house dust and soil Pb is critical to understanding residential exposure, as Pb bioavailability is highly influenced by Pb sources and/or species. We investigated paired house dust and soil collected from homes built before 1978 to determine Pb speciation, source, and bioaccessibility with the primary goal of assessing chemical factors driving Pb exposure in residential media. House dust was predominately found to contain (hydro)cerussite (i.e., Pb (hydroxy)carbonate) phases commonly used in Pb-based paint that, in-turn, promoted elevated bioaccessibility (>60%). Pb X-ray absorption spectroscopy, μ-XRF mapping, and Pb isotope ratio analysis for house dust and soils support house dust Pb as chemically unique compared to exterior soils, although paint Pb is expected to be a major source for both. Soil pedogenesis and increased protection from environmental conditions (e.g., weathering) in households is expected to greatly impact Pb phase differences between house dust and soils, subsequently dictating differences in Pb exposure.
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Affiliation(s)
- Tyler D Sowers
- Center for Environmental Measurement and Modeling, Office of Research and Development, US Environmental Protection Agency, Research Triangle Park, North Carolina 27711, United States
| | - Matthew D Blackmon
- Center for Environmental Measurement and Modeling, Office of Research and Development, US Environmental Protection Agency, Research Triangle Park, North Carolina 27711, United States
| | - Richard T Wilkin
- Center for Environmental Solutions and Emergency Response, Office of Research and Development, U.S. Environmental Protection Agency, Ada, Oklahoma 74820, United States
| | - Matt Rovero
- Center for Environmental Solutions and Emergency Response, Office of Research and Development, U.S. Environmental Protection Agency, Ada, Oklahoma 74820, United States
| | - Sharon E Bone
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
| | - Marissa L Jerden
- Jacobs Technology, Inc., 109 T.W. Alexander Drive, RTP, North Carolina 27711, United States
| | - Clay M Nelson
- BioGeoChem Scientific, Austin, Texas 78748, United States
| | - Karen D Bradham
- Center for Environmental Measurement and Modeling, Office of Research and Development, US Environmental Protection Agency, Research Triangle Park, North Carolina 27711, United States
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5
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Kastury F, Besedin J, Betts AR, Asamoah R, Herde C, Netherway P, Tully J, Scheckel KG, Juhasz AL. Arsenic, cadmium, lead, antimony bioaccessibility and relative bioavailability in legacy gold mining waste. JOURNAL OF HAZARDOUS MATERIALS 2024; 469:133948. [PMID: 38493633 PMCID: PMC11097331 DOI: 10.1016/j.jhazmat.2024.133948] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2023] [Revised: 02/29/2024] [Accepted: 03/01/2024] [Indexed: 03/19/2024]
Abstract
Bioaccessibility and relative bioavailability of As, Cd, Pb and Sb was investigated in 30 legacy gold mining wastes (calcine sands, grey battery sands, tailings) from Victorian goldfields (Australia). Pseudo-total As concentration in 29 samples was 1.45-148-fold higher than the residential soil guidance value (100 mg/kg) while Cd and Pb concentrations in calcine sands were up to 2.4-fold and 30.1-fold higher than the corresponding guidance value (Cd: 20 mg/kg and Pb: 300 mg/kg). Five calcine sands exhibited elevated Sb (31.9-5983 mg/kg), although an Australian soil guidance value is currently unavailable. Arsenic bioaccessibility (n = 30) and relative bioavailability (RBA; n = 8) ranged from 6.10-77.6% and 10.3-52.9% respectively. Samples containing > 50% arsenopyrite/scorodite showed low As bioaccessibility (<20.0%) and RBA (<15.0%). Co-contaminant RBA was assessed in 4 calcine sands; Pb RBA ranged from 73.7-119% with high Pb RBA associated with organic and mineral sorbed Pb and, lower Pb RBA observed in samples containing plumbojarosite. In contrast, Cd RBA ranged from 55.0-67.0%, while Sb RBA was < 5%. This study highlights the importance of using multiple lines of evidence during exposure assessment and provides valuable baseline data for co-contaminants associated with legacy gold mining activities.
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Affiliation(s)
- Farzana Kastury
- Future Industries Institute, STEM, University of South Australia, SA, Australia.
| | - Julie Besedin
- Future Industries Institute, STEM, University of South Australia, SA, Australia; School of Science, STEM, RMIT University, Victoria, Australia
| | - Aaron R Betts
- United States Environmental Protection Agency, Center for Environmental Solutions and Emergency Response, Land Remediation and Technology Division, Cincinnati, OH, USA
| | - Richmond Asamoah
- Future Industries Institute, STEM, University of South Australia, SA, Australia
| | - Carina Herde
- South Australian Health and Medical Research Institute, Adelaide 5086, Australia
| | - Pacian Netherway
- EPA Science, Environment Protection Authority Victoria, Centre for Applied Sciences, Ernest Jones Drive, Macleod, Melbourne, Victoria 3085, Australia
| | - Jennifer Tully
- United States Environmental Protection Agency, Center for Environmental Solutions and Emergency Response, Water Infrastructure Division, Cincinnati, OH, USA
| | - Kirk G Scheckel
- United States Environmental Protection Agency, Center for Environmental Solutions and Emergency Response, Land Remediation and Technology Division, Cincinnati, OH, USA
| | - Albert L Juhasz
- Future Industries Institute, STEM, University of South Australia, SA, Australia
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6
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Santoro N, Singer DM, Mulvey BK, Halasa K, Teutsch N, Shedleski A, Wood M. Neighborhood-scale lead (Pb) speciation in Akron, Ohio (USA) soils: primary sources, post-deposition diagenesis, and high concentrations of labile Pb. ENVIRONMENTAL GEOCHEMISTRY AND HEALTH 2024; 46:164. [PMID: 38592563 PMCID: PMC11003916 DOI: 10.1007/s10653-024-01954-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2024] [Accepted: 03/11/2024] [Indexed: 04/10/2024]
Abstract
Lead (Pb) poses a significant risk to infants and children through exposure to contaminated soil and dust. However, there is a lack of information on Pb speciation and distribution at the neighborhood-scale. This work aimed to determine: (1) the distribution of acid-extractable (labile) Pb and other metals ([M]AE) in two neighborhoods in Akron, Ohio (USA) (Summit Lake and West Akron; n = 82 samples); and (2) Pb speciation and potential sources. Total metal concentration ([M]T) and [M]AE was strongly correlated for Pb and Zn (R2 of 0.66 and 0.55, respectively), corresponding to 35% and 33% acid-extractability. Lead and Zn exhibited a strong positive correlation with each other (R2 = 0.56 for MT and 0.68 for MAE). Three types of Pb-bearing phases were observed by electron microscopy: (1) galena (PbS)-like (5-10 μm); (2) paint chip residuals (10-20 μm); and (3) Pb-bearing Fe-oxides (20 μm). Isotope ratio values for PbAE were 1.159 to 1.245 for 206Pb/207Pb, and 1.999 to 2.098 for 208Pb/206Pb, and there was a statistically significant difference between the two neighborhoods (p = 0.010 for 206Pb/207Pb and p = 0.009 for 208Pb/206Pb). Paint and petrol are the dominant sources of Pb, with some from coal and fly ash. Lead speciation and distribution is variable and reflects a complex relationship between the input of primary sources and post-deposition transformations. This work highlights the importance of community science collaborations to expand the reach of soil sampling and establish areas most at risk based on neighborhood-dependent Pb speciation and distribution for targeted remediation.
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Affiliation(s)
- Nicholas Santoro
- Department of Earth Sciences, Kent State University, Kent, OH, 44242, USA
| | - David M Singer
- Department of Earth Sciences, Kent State University, Kent, OH, 44242, USA.
| | - Bridget K Mulvey
- School of Teaching, Learning and Curriculum Studies, Kent State University, Kent, OH, 44242, USA
| | | | - Nadya Teutsch
- Geochemistry and Environmental Geology Division, Geological Survey of Israel, 9692100, Jerusalem, Israel
| | - Allie Shedleski
- Department of Earth Sciences, Kent State University, Kent, OH, 44242, USA
| | - Madison Wood
- Department of Earth Sciences, Kent State University, Kent, OH, 44242, USA
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7
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Fujimori T, Toyomaki H, Shiota K, Nakata H, Yabe J, Muzandu K, Chawinga K, Doya R, Soe NC, Ishizuka M, Nakayama SMM. Lead speciation in body tissues, gastrointestinal contents, and feces of lead-exposed wild rats (Rattus rattus). THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 908:168297. [PMID: 37944609 DOI: 10.1016/j.scitotenv.2023.168297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2023] [Revised: 10/05/2023] [Accepted: 11/01/2023] [Indexed: 11/12/2023]
Abstract
The toxic effects of lead (Pb) are an ongoing concern for which research continues to seek a solution. In Pb-contaminated areas, Pb concentrations in the environment and organisms are quantified to assess the degree of contamination. Understanding organismal uptake of Pb and its behavior in the body requires distinguishing Pb chemical species. We used Pb L3-edge X-ray absorption near-edge structure (XANES) to study the distribution of Pb species in body tissues, digestive tract contents, and feces of wild rats (Rattus rattus) collected from a heavily Pb-contaminated mining area in Zambia. Freeze-drying improved the XANES spectrum quality by approximately 10 μg-Pb/g-dry through concentrating the Pb without changing its chemical state from its wet state. We successfully identified and analyzed the Pb species in seven different tissues (bone, muscle, liver, kidney, spleen, lung, and brain), three different digestive-tract contents (stomach, small intestine, and colon), and feces from three wild rats. We described chemical-form-based details of Pb uptake and distribution that are common among rats, such as the increased Pb binding with thiol groups through the digestive system, distribution of mobile Pb to hematopoietic organs and vascular-related tissues, and Pb binding to thiol groups, especially in the liver and brain.
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Affiliation(s)
- Takashi Fujimori
- Ecology and Environmental Engineering Course, Faculty of Advanced Science and Technology, Ryukoku University, 1-5 Yokotani, Seta Oe-cho, Otsu, Shiga 520-2194, Japan.
| | - Haruya Toyomaki
- Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Faculty of Veterinary Medicine, Hokkaido University, Kita 18 Nishi 9, Kita-ku, Sapporo 060-0818, Japan
| | - Kenji Shiota
- Department of Environmental Engineering, Graduate School of Engineering, Kyoto University, Katsura, Nisikyo-ku, Kyoto 615-8540, Japan
| | - Hokuto Nakata
- Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Faculty of Veterinary Medicine, Hokkaido University, Kita 18 Nishi 9, Kita-ku, Sapporo 060-0818, Japan
| | - John Yabe
- School of Veterinary Medicine, The University of Zambia, P.O. Box 32379, Lusaka 10101, Zambia; School of Veterinary Medicine, University of Namibia, P.O. Box 13301, Windhoek 10005, Namibia
| | - Kaampwe Muzandu
- School of Veterinary Medicine, University of Namibia, P.O. Box 13301, Windhoek 10005, Namibia
| | - Kenneth Chawinga
- Central Province Veterinary Office, 53 Pauling Street, Kabwe, P.O. Box 80285, Zambia
| | - Rio Doya
- Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Faculty of Veterinary Medicine, Hokkaido University, Kita 18 Nishi 9, Kita-ku, Sapporo 060-0818, Japan
| | - Nyein Chan Soe
- Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Faculty of Veterinary Medicine, Hokkaido University, Kita 18 Nishi 9, Kita-ku, Sapporo 060-0818, Japan
| | - Mayumi Ishizuka
- Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Faculty of Veterinary Medicine, Hokkaido University, Kita 18 Nishi 9, Kita-ku, Sapporo 060-0818, Japan
| | - Shouta M M Nakayama
- Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Faculty of Veterinary Medicine, Hokkaido University, Kita 18 Nishi 9, Kita-ku, Sapporo 060-0818, Japan; School of Veterinary Medicine, The University of Zambia, P.O. Box 32379, Lusaka 10101, Zambia.
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8
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Alankarage D, Betts A, Scheckel KG, Herde C, Cavallaro M, Juhasz AL. Remediation options to reduce bioaccessible and bioavailable lead and arsenic at a smelter impacted site - consideration of treatment efficacy. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2024; 341:122881. [PMID: 37935301 PMCID: PMC10843775 DOI: 10.1016/j.envpol.2023.122881] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2023] [Revised: 10/30/2023] [Accepted: 11/04/2023] [Indexed: 11/09/2023]
Abstract
In this study, smelter contaminated soil was treated with various soil amendments (ferric sulfate [Fe2(SO4)3], triple superphosphate [TSP] and biochar) to determine their efficacy in immobilizing soil lead (Pb) and arsenic (As). In soils incubated with ferric sulfate (0.6M), gastric phase Pb bioaccessibility was reduced from 1939 ± 17 mg kg-1 to 245 ± 4.7 mg kg-1, while intestinal phase bioaccessibility was reduced from 194 ± 25 mg kg-1 to 11.9 ± 3.5 mg kg-1, driven by the formation of plumbojarosite. In TSP treated soils, there were minor reductions in gastric phase Pb bioaccessibility (to 1631 ± 14 mg kg-1) at the highest TSP concentration (6000 mg kg-1) although greater reductions were observed in the intestinal phase, with bioaccessibility reduced to 9.3 ± 2.2 mg kg-1. Speciation analysis showed that this was primarily driven by the formation of chloropyromorphite in the intestinal phase following Pb and phosphate solubilization in the low pH gastric fluid. At the highest concentration (10% w/w), biochar treated soils showed negligible decreases in Pb bioaccessibility in both gastric and intestinal phases. Validation of bioaccessibility outcomes using an in vivo mouse assay led to similar results, with treatment effect ratios (TER) of 0.20 ± 0.01, 0.76 ± 0.11 and 1.03 ± 0.10 for ferric sulfate (0.6M), TSP (6000 mg kg-1) and biochar (10% w/w) treatments. Results of in vitro and in vivo assays showed that only ferric sulfate treatments were able to significantly reduce As bioaccessibility and bioavailability with TER at the highest application of 0.06 ± 0.00 and 0.14 ± 0.04 respectively. This study highlights the potential application of ferric sulfate treatment for the immobilization of Pb and As in co-contaminated soils.
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Affiliation(s)
- Dileepa Alankarage
- Future Industries Institute, STEM, University of South Australia, SA, Australia.
| | - Aaron Betts
- United States Environmental Protection Agency, National Risk Management Research Laboratory, Land Remediation and Pollution Control Division, Cincinnati, OH, USA
| | - Kirk G Scheckel
- United States Environmental Protection Agency, National Risk Management Research Laboratory, Land Remediation and Pollution Control Division, Cincinnati, OH, USA
| | - Carina Herde
- South Australian Health and Medical Research Institute, Preclinical, Imaging and Research Laboratories, Adelaide, 5086, Australia
| | - Michelle Cavallaro
- South Australian Health and Medical Research Institute, Preclinical, Imaging and Research Laboratories, Adelaide, 5086, Australia
| | - Albert L Juhasz
- Future Industries Institute, STEM, University of South Australia, SA, Australia
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9
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Shi M, Min X, Zhang W, Li K, Wu J, Ai Z, Ke Y, Wang Q, Yan X. (Na, Pb)-Jarosite nucleation and growth on anglesite: Implications for inhibition of Pb releasing. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 901:165972. [PMID: 37532039 DOI: 10.1016/j.scitotenv.2023.165972] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Revised: 07/21/2023] [Accepted: 07/30/2023] [Indexed: 08/04/2023]
Abstract
The mobility and bioavailability of Pb can be significantly reduced by Pb-bearing minerals encapsulation in jarosite-group minerals, especially in sulfate-rich environments. However, the kinetic pathways and mechanisms of jarosite-group minerals formations on Pb-bearing mineral surfaces are not well understood. Here, time-resolved heterogeneous (Na, Pb)-jarosite nucleation and growth on anglesite were explored to gain insights into the encapsulation mechanisms. The initial dissolution of anglesite were clearly distinguished, and for the first time, the facet-specific heterogeneous nucleation of (Na, Pb)-jarosite on anglesite was demonstrated. Density functional theory calculations revealed higher adsorption energies and electronic interactions of FeSO4+ complex on anglesite (020), (140), (110) facets, attributed to the preferential nucleation of (Na, Pb)-jarosite on these facets, which resulted in effective passivation of the facets resistant to dissolution. An interpretation was proposed where (Na, Pb)-jarosite grew via a particle-attachment pathway involving the formation of amorphous intermediate, and subsequently, it transformed to the crystalline phase by solid-state conversion. These observations might improve the mechanistic understanding of interface interactions between slightly soluble Pb-bearing minerals and iron minerals, with implications for Pb immobilization in sulfate-rich environments.
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Affiliation(s)
- Meiqing Shi
- School of Metallurgy and Environment, Central South University, Changsha, Hunan 410083, China
| | - Xiaobo Min
- School of Metallurgy and Environment, Central South University, Changsha, Hunan 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha, Hunan 410083, China
| | - Wenchao Zhang
- School of Metallurgy and Environment, Central South University, Changsha, Hunan 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha, Hunan 410083, China
| | - Kaizhong Li
- School of Metallurgy and Environment, Central South University, Changsha, Hunan 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha, Hunan 410083, China
| | - Jiahui Wu
- School of Metallurgy and Environment, Central South University, Changsha, Hunan 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha, Hunan 410083, China
| | - Zhongbin Ai
- Science Environmental Protection Co. Ltd., Changsha 410000, China
| | - Yong Ke
- School of Metallurgy and Environment, Central South University, Changsha, Hunan 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha, Hunan 410083, China
| | - Qingwei Wang
- School of Metallurgy and Environment, Central South University, Changsha, Hunan 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha, Hunan 410083, China.
| | - Xu Yan
- School of Metallurgy and Environment, Central South University, Changsha, Hunan 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha, Hunan 410083, China.
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10
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Root RA, Chorover J. Molecular speciation controls arsenic and lead bioaccessibility in fugitive dusts from sulfidic mine tailings. ENVIRONMENTAL SCIENCE. PROCESSES & IMPACTS 2023; 25:288-303. [PMID: 36226550 PMCID: PMC9945096 DOI: 10.1039/d2em00182a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Accepted: 09/07/2022] [Indexed: 06/16/2023]
Abstract
Communities nearby mine wastes in arid and semi-arid regions are potentially exposed to high concentrations of toxic metal(loid)s from fugitive dusts deriving from impoundments. To assess the relation between potentially lofted particles and human health risk, we studied the relationship between pharmacokinetic bioaccessibility and metal(loid) molecular speciation for mine tailings dust particulate matter (PM), with elevated levels of arsenic and lead (up to 59 and 34 mmol kg-1, respectively), by coupling in vitro bioassay (IVBA) with X-ray absorption spectroscopy (XAS). Mine tailing efflorescent salts (PMES) and PM from the surface crust (0-1 cm, PMSC) and near surface (0-25 cm) were isolated to <10 μm and <150 μm effective spherical diameter (PM10 and PM150) and reacted with synthetic gastric and lung fluid for 30 s to 100 h to investigate toxic metal(loid) release kinetics. Bioaccessible (BAc) fractions of arsenic and lead were about 10 and 100 times greater in gastric than in lung fluid simulant, respectively, and 10-100% of the maximum gastric BAc from PM10 and PM150 occurred within 30 s, with parabolic dissolution of fine, highly-reactive particles followed by slower release from less soluble sources. Evaporite salts were almost completely solubilized in gastric-fluid simulants. Arsenate within jarosite and sorbed to ferrihydrite, and lead from anglesite, were identified by XAS as the principal contaminant sources in the near surface tailings. In the synthetic lung fluid, arsenic was released continuously to 100 h, suggesting that residence time in vivo must be considered for risk determination. Analysis of pre- and post-IVBA PM indicated the release of arsenic in lung fluid was principally from arsenic-substituted jarosite, whereas in synthetic gastric fluid arsenic complexed on ferrihydrite surfaces was preferentially released and subsequently repartitioned to jarosite-like coordination at extended exposures. Lead dissolved at 30 s was subsequently repartitioned back to the solid phase as pyromorphite in phosphate rich lung fluid. The bioaccessibility of lead in surface tailings PM was limited due to robust sequestration in plumbojarosite. Kinetic release of toxic elements in both synthetic biofluids indicated that a single IVBA interval may not adequately describe release dynamics.
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Affiliation(s)
- Robert A Root
- Department of Environmental Science, University of Arizona, Tucson AZ, USA.
| | - Jon Chorover
- Department of Environmental Science, University of Arizona, Tucson AZ, USA.
- Arizona Laboratory for Emerging Contaminants, University of Arizona, Tucson AZ, USA
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Huang X, Chang M, Han L, Li J, Li SW, Li HB. Variation of lead bioaccessibility in soil reference materials: Intra- and inter-laboratory assessments. CHEMOSPHERE 2023; 312:137293. [PMID: 36403811 DOI: 10.1016/j.chemosphere.2022.137293] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Revised: 10/28/2022] [Accepted: 11/17/2022] [Indexed: 06/16/2023]
Abstract
Standard reference materials (SRMs) have been commonly used to perform quality assurance and quality control (QA/QC) in soil total metal concentration analyses or bioaccessibility assessment. In this study, 10 experimenters from 4 laboratories determined bioaccessibility of lead (Pb) in 4 widely-used SRMs (NIST 2710a, NIST 2587, BGS 102, and GBW 07405). Based on the gastric phase (GP) of the unified BARGE bioaccessibility method (UBM) and the Solubility Bioavailability Research Consortium procedure (SBRC), Pb bioaccessibility in SRMs was compared within and between laboratories to assess their intra-laboratory repeatability and inter-laboratory reproducibility. Lead bioaccessibility was 14.1 ± 2.44%-101 ± 2.48% in the 4 SRMs. The values were in vivo validated based on a mouse model in previous studies (R2 = 0.97-0.98), suggesting the reliability of Pb bioaccessibility data. Strong correlations were observed for Pb bioaccessibility among 7 experimenters (R2 = 0.94-0.99) at the Nanjing University (NJU) laboratory and similar strong correlations were also found between each two of the 4 laboratories (R2 = 0.94-0.98), illustrating consistency in intra- and inter-laboratory performance. The intra-laboratory repeatability and inter-laboratory reproducibility were generally acceptable with relative standard deviations (RSDs) of Pb bioaccessibility being ≤10% within laboratory and ≤20% between laboratories, except in a soil with low bioaccessible Pb (BSG 102). Our study suggested that measurements of Pb bioaccessibility in SRMs based on the two in vivo validated methods were repeatable and reproducible within and between laboratories, further verified their reliability being used as QA/QC samples during Pb bioaccessibility assessment.
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Affiliation(s)
- Xiaoyue Huang
- School of Water Conservancy and Environment, University of Jinan, Jinan, 250022, China
| | - Minghui Chang
- School of Water Conservancy and Environment, University of Jinan, Jinan, 250022, China
| | - Lei Han
- Jinan Environmental Research Institute (Jinan Yellow River Basin Ecological Protection Promotion Center), Jinan, 250102, China
| | - Jie Li
- College of Geography and Environment, Shandong Normal University, Jinan, 250399, China
| | - Shi-Wei Li
- School of Water Conservancy and Environment, University of Jinan, Jinan, 250022, China.
| | - Hong-Bo Li
- State Key Laboratory of Pollution Control and Resource Reuse, Jiangsu Key Laboratory of Vehicle Emissions Control, School of the Environment, Nanjing University, Nanjing, 210023, China.
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12
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Li HB, Xue RY, Chen XQ, Lin XY, Shi XX, Du HY, Yin NY, Cui YS, Li LN, Scheckel KG, Juhasz AL, Xue XM, Zhu YG, Ma LQ. Ca Minerals and Oral Bioavailability of Pb, Cd, and As from Indoor Dust in Mice: Mechanisms and Health Implications. ENVIRONMENTAL HEALTH PERSPECTIVES 2022; 130:127004. [PMID: 36541774 PMCID: PMC9769408 DOI: 10.1289/ehp11730] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Revised: 10/21/2022] [Accepted: 11/22/2022] [Indexed: 05/19/2023]
Abstract
BACKGROUND Elevating dietary calcium (Ca) intake can reduce metal(loid)oral bioavailability. However, the ability of a range of Ca minerals to reduce oral bioavailability of lead (Pb), cadmium (Cd), and arsenic (As) from indoor dust remains unclear. OBJECTIVES This study evaluated the ability of Ca minerals to reduce Pb, Cd, and As oral bioavailability from indoor dust and associated mechanisms. METHODS A mouse bioassay was conducted to assess Pb, Cd, and As relative bioavailability (RBA) in three indoor dust samples, which were amended into mouse chow without and with addition of CaHPO 4 , CaCO 3 , Ca gluconate, Ca lactate, Ca aspartate, and Ca citrate at 200 - 5,000 μ g / g Ca . The mRNA expression of Ca and phosphate (P) transporters involved in transcellular Pb, Cd and As transport in the duodenum of mice was quantified using real-time polymerase chain reaction. Serum 1,25-Dihydroxyvitamin D3 [1,25 ( OH ) 2 D 3 ], parathyroid hormone (PTH), and renal CYP27B1 activity controlling 1,25 ( OH ) 2 D 3 synthesis were measured using ELISA kits. Metal(loid) speciation in the feces of mice was characterized using X-ray absorption near-edge structure (XANES) spectroscopy. RESULTS In general, mice exposed to each of the Ca minerals exhibited lower Pb-, Cd-, and As-RBA for three dusts. However, RBAs with the different Ca minerals varied. Among minerals, mice fed dietary CaHPO 4 did not exhibit lower duodenal mRNA expression of Ca transporters but did have the lowest Pb and Cd oral bioavailability at the highest Ca concentration (5,000 μ g / g Ca ; 51%-95% and 52%-74% lower in comparison with the control). Lead phosphate precipitates (e.g., chloropyromorphite) were observed in feces of mice fed dietary CaHPO 4 . In comparison, mice fed organic Ca minerals (Ca gluconate, Ca lactate, Ca aspartate, and Ca citrate) had lower duodenal mRNA expression of Ca transporters, but Pb and Cd oral bioavailability was higher than in mice fed CaHPO 4 . In terms of As, mice fed Ca aspartate exhibited the lowest As oral bioavailability at the highest Ca concentration (5,000 μ g / g Ca ; 41%-72% lower) and the lowest duodenal expression of P transporter (88% lower). The presence of aspartate was not associated with higher As solubility in the intestine. DISCUSSION Our study used a mouse model of exposure to household dust with various concentrations and species of Ca to determine whether different Ca minerals can reduce bioavailability of Pb, Cd, and As in mice and elucidate the mechanism(s) involved. This study can contribute to the practical application of optimal Ca minerals to protect humans from Pb, Cd, and As coexposure in the environment. https://doi.org/10.1289/EHP11730.
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Affiliation(s)
- Hong-Bo Li
- State Key Laboratory of Pollution Control and Resource Reuse, Jiangsu Key Laboratory of Vehicle Emissions Control, School of the Environment, Nanjing University, Nanjing, China
| | - Rong-Yue Xue
- State Key Laboratory of Pollution Control and Resource Reuse, Jiangsu Key Laboratory of Vehicle Emissions Control, School of the Environment, Nanjing University, Nanjing, China
| | - Xiao-Qiang Chen
- State Key Laboratory of Pollution Control and Resource Reuse, Jiangsu Key Laboratory of Vehicle Emissions Control, School of the Environment, Nanjing University, Nanjing, China
| | - Xin-Ying Lin
- State Key Laboratory of Pollution Control and Resource Reuse, Jiangsu Key Laboratory of Vehicle Emissions Control, School of the Environment, Nanjing University, Nanjing, China
| | - Xiao-Xia Shi
- State Key Laboratory of Pollution Control and Resource Reuse, Jiangsu Key Laboratory of Vehicle Emissions Control, School of the Environment, Nanjing University, Nanjing, China
| | - Hai-Yan Du
- Nanjing Institute of Geography & Limnology, Chinese Academy of Sciences, Nanjing, China
| | - Nai-Yi Yin
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, China
| | - Yan-Shan Cui
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, China
| | - Li-Na Li
- Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Science, Shanghai, China
| | - Kirk G. Scheckel
- National Risk Management Research Laboratory, Land Remediation and Pollution Control Division, U.S. Environmental Protection Agency, Cincinnati, Ohio, USA
| | - Albert L. Juhasz
- Future Industries Institute, University of South Australia, Mawson Lakes, South Australia, Australia
| | - Xi-Mei Xue
- Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, China
| | - Yong-Guan Zhu
- Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, China
| | - Lena Q. Ma
- Institute of Soil and Water Resources and Environmental Science, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, China
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Sowers TD, Blackmon MD, Bone SE, Kirby AM, Jerden ML, Noerpel MR, Scheckel KG, Bradham KD. Successful Conversion of Pb-Contaminated Soils to Low-Bioaccessibility Plumbojarosite Using Potassium-Jarosite at Ambient Temperature. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:15718-15727. [PMID: 36239028 PMCID: PMC10398550 DOI: 10.1021/acs.est.2c05606] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Methods promoting lead (Pb) phase transformation in soils are essential for decreasing Pb bioaccessibility/bioavailability and may offer an in situ, cost-efficient process for mitigating contaminant exposure. Recent plumbojarosite (PLJ) conversion methods have shown the greatest potential to reduce soil Pb bioaccessibility, an in vitro bioaccessibility assay measurement of the proportion of Pb solubilized under gastric chemical conditions. Soils tested utilizing the recent PLJ method were found to have a Pb bioaccessibility of <1%, compared to original soils possessing bioaccessibility of >70%. However, this technique requires heat (95-100 °C) to promote mineral transformation. Jarosite-group minerals may incorporate multiple interlayer cations; therefore, we probed the potential for jarosite to remediate Pb via intercalation by reacting presynthesized potassium (K)-jarosite with aqueous Pb and/or Pb-contaminated soil at room temperature. Both K-jarosite and heated PLJ-treated samples were investigated by pairing bioaccessibility analyses with advanced bulk and spatially resolved X-ray absorption spectroscopy analyses. Samples treated with K-jarosite promoted Pb transformation to low-bioaccessibility (<10%) PLJ, with soil being converted to 100% PLJ using both heated and nonheated techniques. μ-X-ray fluorescence (μ-XRF) and μ-X-ray absorption near-edge structure (μ-XANES) showcase significant differences between elemental interactions for heated and nonheated PLJ-treated samples with anglesite impurities being found on the microscale. Although further development is necessary to accommodate for suitable field conditions, results indicate, for the first time, that K-jarosite may successfully convert soil Pb to PLJ without high-temperature conditions. The newfound utility of K-jarosite is expected to be key to future jarosite-based soil Pb remediation method development.
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Affiliation(s)
- Tyler D Sowers
- Center of Environmental Measurement and Modeling, Office of Research and Development, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina 27711, United States
| | - Matthew D Blackmon
- Center of Environmental Measurement and Modeling, Office of Research and Development, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina 27711, United States
| | - Sharon E Bone
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
| | - Alicia M Kirby
- Oak Ridge Associated Universities, Oak Ridge, Tennessee 37830, United States
| | - Marissa L Jerden
- Jacobs Technology, Inc., 109 T.W. Alexander Drive, Research Triangle Park, North Carolina 27711, United States
| | - Matthew R Noerpel
- Center for Environmental Solutions & Emergency Response, Office of Research and Development, U.S. Environmental Protection Agency, Cincinnati, Ohio 45268, United States
| | - Kirk G Scheckel
- Center for Environmental Solutions & Emergency Response, Office of Research and Development, U.S. Environmental Protection Agency, Cincinnati, Ohio 45268, United States
| | - Karen D Bradham
- Center of Environmental Measurement and Modeling, Office of Research and Development, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina 27711, United States
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Juhasz AL, Kastury F, Herde C, Tang W. Application of soil amendments for reducing PFAS leachability and bioavailability. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2022; 307:119498. [PMID: 35618144 DOI: 10.1016/j.envpol.2022.119498] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Revised: 05/12/2022] [Accepted: 05/15/2022] [Indexed: 06/15/2023]
Abstract
In this study, changes in PFAS leachability and bioavailability were determined following the application of RemBind®100 (R100) and RemBind®300 (R300; 1-10% w/w) to PFAS-contaminated soil (Ʃ28 PFAS 3.093-32.78 mg kg-1). Small differences were observed in PFAS immobilization efficacy when soil was amended with RemBind® products although adding 5% w/w of either product resulted in a >98% reduction in ASLP PFAS leachability. Variability in immobilization efficacy was attributed to differences in activated carbon composition which influenced physicochemical properties of RemBind® formulations and PFAS sorption. PFOS, PFHxS and PFOA relative bioavailability was also assessed in unamended and amended soil (5% w/w) using an in vivo mouse model. In unamended soil, PFAS relative bioavailability was >60% with differences attributed to physicochemical properties of soil which influenced electrostatic and hydrophobic interactions. However, when PFAS relative bioavailability was assessed in soil amended with 5% w/w R100, individual PFAS relative bioavailability was reduced to 16.1 ± 0.8% to 26.1 ± 0.9% with similar results observed when R300 (5% w/w) was utilised (14.4 ± 1.6% to 24.3 ± 0.8%). Results from this study highlight that soil amendments have the potential to reduce both PFAS leachability and relative bioavailability thereby decreasing mobility and potential exposure to soil-borne contaminants.
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Affiliation(s)
- Albert L Juhasz
- Future Industries Institute, University of South Australia, Adelaide, Australia.
| | - Farzana Kastury
- Future Industries Institute, University of South Australia, Adelaide, Australia
| | - Carina Herde
- South Australian Health and Medical Research Institute, Adelaide, Australia
| | - Wayne Tang
- Future Industries Institute, University of South Australia, Adelaide, Australia
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