Department of Plant Biology and Soil Science, Universidade de Vigo, As Lagoas, Marcosende, 36310, Vigo, Spain.
Environ Sci Pollut Res Int. 2015 May;22(10):7859-72. doi: 10.1007/s11356-014-4027-9. Epub 2015 Jan 14.
Lead pollution was evaluated in 17 urban soils from parks and gardens in the city of Vigo (NW Spain). The Pb isotope ratios ((207)Pb/(206)Pb, (208)Pb/(204)Pb, (206)Pb/(204)Pb and (208)Pb/(206)Pb) were determined after being measured by MC-ICP-MS. The association of the isotopes ((204)Pb, (206)Pb, (207)Pb and (208)Pb) with the different components of the soil was studied using TOF-SIMS. The isotopic ranges obtained for the samples were between 1.116 and 1.203 ((206)Pb/(207)Pb), 2.044-2.143 ((208)Pb/(206)Pb), 37.206-38.608 ((208)Pb/(204)Pb), 15.5482-15.6569 ((207)Pb/(204)Pb) and 17.357-18.826 ((206)Pb/(204)Pb). The application of the three-end-member model indicates that the Pb derived from petrol is the main source of Pb in the soils (43.51% on average), followed by natural or geogenic Pb (39.12%) and industrial emissions (17.37%). The emissions derived from coal combustion do not appear to influence the content of Pb in the soil. TOF-SIMS images show that the Pb mainly interacts with organic matter. This technique contributes to the understanding of the association of anthropogenic Pb with the components of the soil, as well as the particle size of these associations, thus allowing the possible sources of Pb to be identified.
对西班牙西北部城市维哥（Vigo）公园和花园的 17 种城市土壤进行了铅污染评估。使用 MC-ICP-MS 测量后，确定了 Pb 同位素比值（((207)Pb/(206)Pb、(208)Pb/(204)Pb、(206)Pb/(204)Pb 和 (208)Pb/(206)Pb）。使用 TOF-SIMS 研究了同位素（((204)Pb、(206)Pb、(207)Pb 和 (208)Pb）与土壤不同成分的关系。获得的样品同位素范围为 1.116 至 1.203（((206)Pb/(207)Pb）、2.044-2.143（((208)Pb/(206)Pb）、37.206-38.608（((208)Pb/(204)Pb）、15.5482-15.6569（((207)Pb/(204)Pb）和 17.357-18.826（((206)Pb/(204)Pb）。三端元模型的应用表明，源自汽油的 Pb 是土壤中 Pb 的主要来源（平均占 43.51%），其次是天然或地质成因的 Pb（39.12%）和工业排放（17.37%）。来自煤炭燃烧的排放似乎不会影响土壤中 Pb 的含量。TOF-SIMS 图像显示，Pb 主要与有机物相互作用。该技术有助于了解人为 Pb 与土壤成分的关系，以及这些结合物的粒径，从而可以确定 Pb 的可能来源。
