An update of the Pb isotope inventory in post leaded-petrol Singapore environments

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...

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Main Authors: Carrasco, Gonzalo, Chen, Mengli, Boyle, Edward A., Tanzil, Jani, Zhou, Kuanbo, Goodkin, Nathalie F.
Other Authors: Asian School of the Environment
Format: Article
Language:English
Published: 2019
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Online Access:https://hdl.handle.net/10356/90127
http://hdl.handle.net/10220/48392
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-901272020-09-26T21:29:41Z An update of the Pb isotope inventory in post leaded-petrol Singapore environments Carrasco, Gonzalo Chen, Mengli Boyle, Edward A. Tanzil, Jani Zhou, Kuanbo Goodkin, Nathalie F. Asian School of the Environment Earth Observatory of Singapore DRNTU::Science::Geology Pb Isotope Singapore 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 206Pb/207Pb 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. NRF (Natl Research Foundation, S’pore) MOE (Min. of Education, S’pore) Accepted version 2019-05-28T01:01:01Z 2019-12-06T17:41:17Z 2019-05-28T01:01:01Z 2019-12-06T17:41:17Z 2018 Journal Article Carrasco, G., Chen, M., Boyle, E. A., Tanzil, J., Zhou, K., & Goodkin, N. F. (2018). An update of the Pb isotope inventory in post leaded-petrol Singapore environments. Environmental Pollution, 233, 925-932. doi:10.1016/j.envpol.2017.09.025 0269-7491 https://hdl.handle.net/10356/90127 http://hdl.handle.net/10220/48392 10.1016/j.envpol.2017.09.025 en Environmental Pollution © 2017 Elsevier Ltd.. All rights reserved. This paper was published in Environmental Pollution and is made available with permission of Elsevier Ltd. 44 p. application/pdf
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic DRNTU::Science::Geology
Pb Isotope
Singapore
spellingShingle DRNTU::Science::Geology
Pb Isotope
Singapore
Carrasco, Gonzalo
Chen, Mengli
Boyle, Edward A.
Tanzil, Jani
Zhou, Kuanbo
Goodkin, Nathalie F.
An update of the Pb isotope inventory in post leaded-petrol Singapore environments
description 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 206Pb/207Pb 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.
author2 Asian School of the Environment
author_facet Asian School of the Environment
Carrasco, Gonzalo
Chen, Mengli
Boyle, Edward A.
Tanzil, Jani
Zhou, Kuanbo
Goodkin, Nathalie F.
format Article
author Carrasco, Gonzalo
Chen, Mengli
Boyle, Edward A.
Tanzil, Jani
Zhou, Kuanbo
Goodkin, Nathalie F.
author_sort Carrasco, Gonzalo
title An update of the Pb isotope inventory in post leaded-petrol Singapore environments
title_short An update of the Pb isotope inventory in post leaded-petrol Singapore environments
title_full An update of the Pb isotope inventory in post leaded-petrol Singapore environments
title_fullStr An update of the Pb isotope inventory in post leaded-petrol Singapore environments
title_full_unstemmed An update of the Pb isotope inventory in post leaded-petrol Singapore environments
title_sort update of the pb isotope inventory in post leaded-petrol singapore environments
publishDate 2019
url https://hdl.handle.net/10356/90127
http://hdl.handle.net/10220/48392
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