期刊
ENVIRONMENTAL POLLUTION
卷 233, 期 -, 页码 925-932出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2017.09.025
关键词
Pb isotope; Singapore; Southeast Asia; Isotope exchange
资金
- Singapore Ministry of Education
- Singapore National Research Foundation (NRF) through the Singapore-MIT Alliance for Research and Technology's (SMART) Center for Environmental Sensing and Modeling (CENSAM) interdisciplinary research program [NRF-RF2012-03]
- Singapore National Research Foundation (NRF) through the Singapore NRF Fellowship scheme [NRF-RF2012-03]
- CENSAM Research Initiative program
Pb is a trace metal that tracks anthropogenic pollution in natural environments. Despite recent leaded petrol phase out around Southeast Asia, the region's growth has resulted in continued exposure of Pb from a variety of sources. In this study, sources of Pb into Singapore, a highly urbanised city-state situated in the central axis of Southeast Asia, are investigated using isotopic ratios and concentrations. We compiled data from our previous analyses of aerosols, incineration fly ash and sediments, with new data from analyses of soil from gas stations, water from runoff and round-island coastal seawater to obtain a spatio-temporal overview of sources of Pb into the Singapore environment. Using Pb-206/Pb-207 ratio, we identified three main Pb source origins: natural Pb (1.215 +/- 0.001), historic/remnant leaded petrol (1.123 +/- 0.013), and present-day industrial and incinerated waste (1.148 +/- 0.005). Deep reservoir sediments bore larger traces of Pb from leaded petrol, but present-day runoff waters and coastal seawater were a mix of industrial and natural sources with somewhat variable concentrations. We found temporal variability in Pb isotopic ratio in aerosols indicating alternating transboundary Pb sources to Singapore that correspond to seasonal changes in monsoon winds. By contrast, seasonal monsoon circulation did not significantly influence isotopic ratios of coastal seawater Pb. Instead, seawater Pb was driven more by location differences, suggesting stronger local-scale drivers of Pb such as point sources, water flushing, and isotope exchange. The combination of multiple historic and current sources of Pb shown in this study highlights the need for continued monitoring of Pb in Southeast Asia, especially in light of emerging industries and potential large sources of Pb such as coal combustion. (C) 2017 Elsevier Ltd. All rights reserved.
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