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- W2022095057 abstract "The isotopic composition of lead collected with grass samples taken over the period 1989–2001 from plots at two upland locations (Glensaugh in north east and Hartwood in central Scotland) has been determined using thermal ionisation mass spectrometry. Although marked reductions in lead concentrations in grass were observed at Glensaugh in the initial three years, subsequently concentrations have remained relatively constant (1–3 µg g−1) in all plots to the present day. The one exception was a roadside plot at Hartwood which showed a large reduction from 1.0 µg g−1 in 1999 to 0.2 µg g−1 in 2000 following the abolition of petrol lead in the UK at the beginning of 2000. The total concentrations at this plot were consistently lower than those found at plots away from road traffic but exposed to the prevailing wind direction. The 206Pb/207Pb ratio increased steadily at all the plots throughout the period of the study indicating the reducing influence of petrol lead but the changes were not as great as might be expected with the decrease in the use of leaded petrol. Assuming the collected lead had only two sources, petrol lead and a diffuse background “industrial” lead, the proportion of petrol lead was only in the range 17–69% for roadside samples and 0–39% in other samples. A substantial proportion of deposited lead, therefore, now has its origin other than in petrol. Mixing curves indicate that whereas the lead deposited at Glensaugh could be defined by only two end members, that at Hartwood needs more than two components in the mixture. The results also suggest that although petrol lead has been eliminated, traffic is still a source of lead and another source defined as “traffic lead” should be considered." @default.
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- W2022095057 date "2002-02-05" @default.
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- W2022095057 title "Isotopic characterisation of lead deposited 1989–2001 at two upland Scottish locations" @default.
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- W2022095057 doi "https://doi.org/10.1039/b109731h" @default.
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