Environmental Science, Faculty of Science, Macquarie University, Sydney, NSW, 2159, Australia.
Environmental Science, Faculty of Science, Macquarie University, Sydney, NSW, 2159, Australia.
Environ Pollut. 2014 Jul;190:159-65. doi: 10.1016/j.envpol.2014.03.025. Epub 2014 Apr 22.
This 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 ((208)Pb/(207)Pb; (206)Pb/(207)Pb). Lead concentrations in the ash ranged from 1 to 36 mg/kg, bracketing the range of lead (4-23 mg/kg) in surface soils (0-2 cm), subsurface (40-50 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.
本研究利用铅同位素组成（((208)Pb / (207)Pb；(206)Pb / (207)Pb），鉴定了 2011 年澳大利亚三个相对原始地区灌木丛火灾中灰烬沉积物中自然和工业再移动的铅。灰烬中的铅浓度范围为 1 至 36 毫克/千克，与表层土壤（0-2 厘米）、亚表层（40-50 厘米）土壤和岩石中的铅（4-23 毫克/千克）范围相吻合。将灰烬和表层土壤样品的铅同位素组成与亚表层土壤和当地基岩样品进行了比较。数据表明，许多灰烬和表层土壤的铅同位素组成是自然铅和遗留工业铅沉积（如含铅汽油燃烧）的混合物。然而，每个地点的一些灰烬样本的铅同位素组成不符合简单的两个端元混合模型，表明存在其他未确定的来源。
