Lead isotopic compositions of ash sourced from Australian bushfires

Kristensen, Louise; Taylor, Mark Patrick; Odigie, Kingsley O.; Hibdon, Sharon; Flegal, A. Russell

doi:10.1016/j.envpol.2014.03.025

Cited by 40 publications

(15 citation statements)

References 29 publications

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“…The remobilisation of historic Pb deposits in wildfire ash has also been documented in Australia. The release of Pb during wildfire events and the redistribution of environmental contaminants have received increasing research interest in recent years (Kristensen and others, 2014; Kristensen and others, 2017). Therefore, ( 206 Pb/ 207 Pb) Ant was set to 1.134 based on the average of the results from Australia, including aerosol and wildfire sources (1.139 for aerosols and 1.129 for wildfires; Kristensen and others, 2017).…”

Section: Resultsmentioning

confidence: 99%

Identification of multiple natural and anthropogenic sources of dust in snow from Zhongshan Station to Dome A, East Antarctica

Xiao

Ding

et al. 2018

J. Glaciol.

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The stable oxygen isotope composition, major ions and isotopic compositions of strontium (Sr), neodymium (Nd) and lead (Pb) in insoluble dust from recent surface snow samples along the transect from the Zhongshan and Progress stations (located on the Amery Ice Shelf, East Antarctica) to Dome A (Summit, Antarctica) were analysed. No previous isotopic fingerprinting studies have been conducted for this transect. These data were used to document the dust provenances in Antarctica along the transect up to the highest site, Dome A, for the first time. The insoluble dust in snow samples along the coast displays an overall crust-line isotopic signature that is characterised by highly radiogenic 87Sr/86Sr values and less radiogenic 143Nd/144Nd values. These signatures are comparable with those of samples collected near the ice-free areas of the Zhongshan and Progress stations. Spatial differences are statistically significant along the transect, and the Sr, Nd and Pb isotope components in insoluble dust from two continuous snow samples at Dome A exhibit marked differences, indicating that additional dust reaches the East Antarctic Plateau. The isotopic characteristics of insoluble dust from this transect indicate that the long-distance natural dust and anthropogenic pollutants in these samples primarily originate from Australia.

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Section: Resultsmentioning

confidence: 99%

Identification of multiple natural and anthropogenic sources of dust in snow from Zhongshan Station to Dome A, East Antarctica

Xiao

Ding

et al. 2018

J. Glaciol.

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“…Also included in the plot are the ranges of natural and industrial lead isotopic ratios of aerosols collected from Central-South Chile (Böllhofer and Rosman 2000;De Vleeschouwer et al 2008) reported at sublethal blood Pb (PbB) levels that were previously considered harmless (Wheeler and Brown 2013). Although the amounts of trace elements mobilized in Patagonia by wildfire are relatively small compared to those mobilized in more industrialized regions (e.g., Kristensen et al 2014;Odigie and Flegal 2014), increased remobilization of Pb by wildfire could become problematic.…”

Section: Potential Environmental and Health Implicationsmentioning

confidence: 99%

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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“…The latter include a recent study in the relatively unpopulated and relatively pristine Santa Barbara area north of Los Angeles [25] and a similar study in Australia [26]. In contrast to those studies, this study was conducted in the Angeles National Forest, which is adjacent to the Los Angeles Metropolitan area, which has a population of ∼17 million [27], has many large sources of industrial contaminants [28]–[30], and ranks as one of the nation’s most contaminated metropolitan areas [31].…”

Section: Introductionmentioning

confidence: 99%

Trace Metal Inventories and Lead Isotopic Composition Chronicle a Forest Fire’s Remobilization of Industrial Contaminants Deposited in the Angeles National Forest

Odigie

Flegal

2014

PLoS ONE

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The amounts of labile trace metals: [Co] (3 to 11 µg g−1), [Cu] (15 to 69 µg g−1), [Ni] (6 to 15 µg g−1), [Pb] (7 to 42 µg g−1), and [Zn] (65 to 500 µg g−1) in ash collected from the 2012 Williams Fire in Los Angeles, California attest to the role of fires in remobilizing industrial metals deposited in forests. These remobilized trace metals may be dispersed by winds, increasing human exposures, and they may be deposited in water bodies, increasing exposures in aquatic ecosystems. Correlations between the concentrations of these trace metals, normalized to Fe, in ash from the fire suggest that Co, Cu, and Ni in most of those samples were predominantly from natural sources, whereas Pb and Zn were enriched in some ash samples. The predominantly anthropogenic source of excess Pb in the ash was further demonstrated by its isotopic ratios (208Pb/207Pb: 206Pb/207Pb) that fell between those of natural Pb and leaded gasoline sold in California during the previous century. These analyses substantiate current human and environmental health concerns with the pyrogenic remobilization of toxic metals, which are compounded by projections of increases in the intensity and frequency of wildfires associated with climate change.

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Lead isotopic compositions of ash sourced from Australian bushfires

Cited by 40 publications

References 29 publications

Identification of multiple natural and anthropogenic sources of dust in snow from Zhongshan Station to Dome A, East Antarctica

Identification of multiple natural and anthropogenic sources of dust in snow from Zhongshan Station to Dome A, East Antarctica

Remobilization of trace elements by forest fire in Patagonia, Chile

Trace Metal Inventories and Lead Isotopic Composition Chronicle a Forest Fire’s Remobilization of Industrial Contaminants Deposited in the Angeles National Forest

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