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Impact on the environment from steel bridge paint deterioration using lead isotopic tracing, paint compositions and soil deconstruction

Gulson, Brian
Davis, Jeffrey
O'Connor, Gary
Published in Science of the total environment. 2016, vol. 550, p. 69-72
Abstract Deterioration and repair of lead paint on steel structures can result in contamination of the ambient environment but other sources of lead such as from past use of leaded paint and gasoline and industrial activities can also con- tribute to the contamination. Using a combination of high precision lead isotopic tracing, detailed paint examina- tion, including with scanning electron microscopy, and soil deconstruction we have compared paint on a steel bridge and bulk soil and lead-rich particles separated from soil. The majority of Pb found in the paint derives from Australian sources but some also has a probable US origin. The isotopic data for the bulk soils and selected particles lie on a mixing line with end members the geologically ancient Broken Hill lead and possible European lead which is suggested to be derived from old lead paint and industrial activities. Data for gasoline-derived par- ticulates lie on this array and probably contribute to soil Pb. Although paint from the bridge can be a source of lead in the soils, isotopic tracing, paint morphology and mineralogical identification indicate that other sources, in- cluding from paint, gasoline and industrial activities, are contributing factors to the lead burden. Even though physical characteristics and elemental composition are the same in some particles, the isotopic signatures dem- onstrate that the sources are different. Plots using 206Pb/208Pb vs 206Pb/207Pb ratios, the common representation these days, do not allow for source discrimination in this investigation.
Keywords BridgeSoilPaintLead isotopesSEMMicroscopy
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Research groups Isotope Geochemistry, Geochronology and Thermochronology
Mineral Resources and Geofluids
(ISO format)
GULSON, Brian et al. Impact on the environment from steel bridge paint deterioration using lead isotopic tracing, paint compositions and soil deconstruction. In: Science of the total environment, 2016, vol. 550, p. 69-72. doi: 10.1016/j.scitotenv.2016.01.083 https://archive-ouverte.unige.ch/unige:80264

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Deposited on : 2016-02-02

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