Pyrogenic Remobilization of Historic Industrial Lead Depositions

Odigie, Kingsley O.; Flegal, A. Russell

doi:10.1021/es200944w

Cited by 43 publications

(31 citation statements)

References 54 publications

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“…The use of a concentrated HCl/ HNO 3 digestion method in this study measures the acid-leachable (labile) levels of lead in the samples. The derived values are conservative relative to those achieved via a concentrated HF digestion, which would also extract natural lead within refractory aluminosilicates (Odigie and Flegal, 2011).…”

Section: Methodsmentioning

confidence: 88%

“…Recovery for SRM 1547 was 91% (RSD 3%) while for SRM 1633b, recovery was 47% (RSD 8.5%). The former (SRM 1547) provides the best estimate of lead recoveries in ash samples because they are derived predominantly from vegetation and organic soil material, as observed previously (Odigie and Flegal, 2011). The soil samples were digested concurrently with NIST SRM 2704 (Buffalo River Sediment) and National Research Council Canada (NRCC) PACS-1 (British Columbia Harbor Sediment), which had recoveries of 43% (RSD 4%) and 76% (RSD 7.4%), respectively.…”

Section: Methodsmentioning

confidence: 99%

“…In all cases, ash samples were collected from the burnt remains at the base of large old eucalypt trees that had been destroyed during the fire events. This targeted sampling approach differs from that used in Odigie and Flegal (2011) who relied on the collection of ash samples accumulated at the surface of soils in the burnt area. Older trees were the focus of the sampling because we hypothesized that these trees would be more likely to contain signatures of historic lead depositions compared to smaller, younger trees that would have grown in period following the introduction and domination of Australian unleaded petrol for all new vehicles from 1986 (Australian Government, Department of Environment, 2001).…”

Section: Sample Collection Sitesmentioning

confidence: 99%

“…While the collected samples were spread widely across each of the locations (Tostaree Fire 110 km 2 ; Red Hill Fire 11.7 km 2 ; Kelmscott Fire 10 km 2 ), the occurrence of ashed older trees dictated individual sample locations (Table S1, Supporting information). The ash was collected in plastic bags, using established trace metal clean procedures (Odigie and Flegal, 2011).…”

Section: Sample Collection Sitesmentioning

confidence: 99%

“…These include fires, which pose potential health risks due to smoke and particulate emissions (Weinhold, 2011) along with their role in redistributing elements such as mercury (Finley et al, 2009) and lead (Nriagu, 1989). Given that fluctuations in atmospheric lead emissions have been linked to changes in blood lead levels (Annest et al, 1983) and that there is still no established safe level for lead (NHMRC, 2009;WHO, 2010), the likelihood that bushfires mobilise historic lead depositions (Odigie and Flegal, 2011) warrants investigation. Previous studies have shown that heavy metals can become enriched in the residues formed from the burning of biomass (Nzihou and Stanmore, 2013).…”

Section: Introductionmentioning

confidence: 99%

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Lead isotopic compositions of ash sourced from Australian bushfires

Kristensen

Taylor²,

Odigie

et al. 2014

Environmental Pollution

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a b s t r a c tThis study identifies natural and industrial lead remobilized in ash deposits from three bushfires in relatively pristine areas of Australia in 2011 using lead isotopic compositions ( Pb). Lead concentrations in the ash ranged from 1 to 36 mg/kg, bracketing the range of lead (4e23 mg/kg) in surface soils (0e2 cm), subsurface (40e50 cm) soils and rocks. The lead isotopic compositions of ash and surface soil samples were compared to subsurface soils and local bedrock samples. The data show that many of the ash and surface soil lead isotopic compositions were a mixture of natural lead and legacy industrial lead depositions (such as leaded petrol combustion). However, some of the ash samples at each of the sites had lead isotopic compositions that did not fit a simple two end-member mixing model, indicating other, unidentified sources.

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Section: Methodsmentioning

confidence: 88%

Section: Methodsmentioning

confidence: 99%

Section: Sample Collection Sitesmentioning

confidence: 99%

Section: Sample Collection Sitesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Lead isotopic compositions of ash sourced from Australian bushfires

Kristensen

Taylor²,

Odigie

et al. 2014

Environmental Pollution

Self Cite

View full text Add to dashboard Cite

show abstract

Remobilization of trace elements by forest fire in Patagonia, Chile

et al. 2015

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Temporal changes in the amounts of trace elements (As, Co, Cu, Mn, Ni, Pb, and Zn) and their correlations with temporal changes in charcoal abundance in age-dated sediments collected from Lake Thompson in Patagonia, Chile, attest to the substantial pyrogenic remobilization of contaminants that occurred in Patagonia during the mid-1900s. This remobilization was concurrent with the extensive slash and burn period in the region during that period. The changes in concentrations of Co, Cu, and Ni in relation to charcoal abundance in the lacustrine sediments over time were small compared to those of As, Mn, Pb, and Zn. However, the relatively low enrichment factors of all those trace elements, normalized to Fe, indicate that they were predominantly derived from local, natural sources impacted by fires rather than industrial sources. The primarily local source of Pb in the sediments was corroborated by the temporal consistency of its isotopic ratios ( 206 Pb/ 207 Pb: 208 Pb/ 206 Pb), which were similar to previously reported values for natural lead in Central and Southern Chile. However, the pyrogenic remobilization of both natural and industrial trace elements by forest fires in Chile and elsewhere is expected to rise as a consequence of climate change, which is projected to increase both the frequency and intensity of forest fires on a global scale.

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Fire-induced effects on the bioavailability of potentially toxic elements in a polluted agricultural soil: implications for Cr uptake by durum wheat plants

Rascio

Gattullo

Porfido

et al. 2022

Environ Sci Pollut Res

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Fire events can modify the distribution and speciation of potentially toxic elements (PTEs) in soil, especially if they are associated to organic matter (OM). In fact, OM can undergo substantial structural modifications at high temperatures, up to the complete mineralization. The present study aims to investigate the changes of PTEs’ bioavailability to durum wheat (Triticum durum Desf.) plants after simulating fire events (up to 300 °C and 500 °C) in an agricultural soil polluted by Cr, Zn, Cu, and Pb. The PTEs’ uptake and allocation in plant tissues were assessed using the RHIZOtest system. After the fire simulations, no evident risk of accumulation and translocation in plants was observed for Zn, Pb, and Cu. Conversely, a high accumulation in roots and a significant translocation to shoots were observed for Cr, which reached concentrations of 829 mg kg−1 in roots and 52 mg kg−1 in shoots at 500 °C. Additional experimental evidence suggested that Cr was taken up by plants grown on heated soils as Cr(VI). Once acquired by roots, only a small part of Cr (up to 6%) was translocated to shoots where it was likely present as mobile forms, as evidenced by micro X-ray fluorescence (µ-XRF) analyses. Overall, the results obtained provide evidence that the high temperatures occurring during fire events can increase the mobility and bioavailability of certain PTEs transforming apparently safe environments into potentially dangerous sources of pollution. These processes can ultimately affect the human health through the food chain transfer of PTEs or their migration into surface water and groundwater.

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Pyrogenic Remobilization of Historic Industrial Lead Depositions

Cited by 43 publications

References 54 publications

Lead isotopic compositions of ash sourced from Australian bushfires

Lead isotopic compositions of ash sourced from Australian bushfires

Remobilization of trace elements by forest fire in Patagonia, Chile

Fire-induced effects on the bioavailability of potentially toxic elements in a polluted agricultural soil: implications for Cr uptake by durum wheat plants

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