Can a climate-triggered export of old contaminants from the soil alter the lead (Pb) contaminant burden of subarctic lakes? To address this question, we reconstructed the pollution history of three high latitude lakes situated in a region where a recent climatic shift has occurred. Dated sediment records were used as archives of past Pb inputs to the lakes, where the difference in the (206)Pb/(...

Two groups of schoolchildren between seven and 12 years old residing in the vicinity of a non-ferrous industrial plant and exposed to lead (Pb) at a concentration that could cause health problems, were monitored. Concentrations of Pb in blood (blood-Pb), which were determined at regular six monthly intervals, were related to the Pb concentrations in surface tooth enamel (enamel-Pb). Acid etch b...

Knowledge on the lithologically inherited variation in present day Pb isotope ratios in soils is remarkably limited. Such information is essential to determine the anthropogenic Pb fraction and anthropogenic Pb sources in Pb polluted soils. This study presents results of a survey of subsoil samples of approximately 350 rural locations covering the entire Netherlands, for which the bulk geochemi...

A method for the determination of Pb isotope ratios (IR) in cigarette tobacco by quadrupole inductively coupled plasma mass spectrometry (Q-ICP-MS) has been developed and applied to tobacco samples from genuine and counterfeit cigarettes obtained in the USA. The IR ²⁰⁷Pb/²⁰⁶Pb, (208)Pb/²⁰⁶Pb, ²⁰⁶Pb/²⁰⁴Pb, ²⁰⁷Pb/²⁰⁴Pb and ²⁰⁸Pb/²⁰⁴Pb were measured using a Q-ICP-MS instrument. Two certified refer...

OTHER HIGH-RESOLUTION CHRONOMETERS. Y. Amelin, M. Wadhwa, and G. Lugmair, Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada, Dept. of Geology, The Field Museum, 1400 S. Lake Shore Dr., Chicago, IL 60605, USA and The Chicago Center for Cosmochemistry, 5640 S. Ellis Ave., Chicago, IL 60637, Scripps Inst. of Oceanography, University of Calif. San Diego, La Jolla, CA 92...

Recent NA49 results on Λ, ¯ Λ, Ξ − and ¯ Ξ + production in minimum bias p+p and centrality selected p+Pb collisions at 158 GeV/c, and the results on Λ, ¯ Λ, K + and K − production in central Pb+Pb collisions at 40, 80 and 158 A·GeV are discussed and compared with other available data. By comparing the energy dependence of Λ and ¯ Λ production at mid-rapidity a striking similarity is observed be...

Anthropogenic emissions have dominated marine Pb sources during the past century. Here we present Pb concentrations and isotope compositions for ocean depth profiles collected in the eastern Tropical Atlantic Ocean (GEOTRACES section GA06), to trace the transfer of anthropogenic Pb into the ocean interior. Variations in Pb concentration and isotope composition were associated with changes in hy...

This study examined trace metal contamination of sediments in Guiyu, China where primitive e-waste processing activities have been carried out. It was found that some river sediments in Guiyu were contaminated with Cd (n.d.-10.3mg/kg), Cu (17.0-4540mg/kg), Ni (12.4-543mg/kg), Pb (28.6-590mg/kg), and Zn (51.3-324mg/kg). The (206)Pb/(207)Pb and (208)Pb/(207)Pb ratios of the Pb-contaminated sedime...

Introduction: Many lunar samples record some degree of disturbance to their U-Pb isotopic systematics [e.g., 1,2]. This disturbance may be reflected in Pb-Pb, U-Pb, U-Pb, or concordia ages that are discordant among the U-Pb systems as well as with more robust Sm-Nd and Rb-Sr ages. Both mare basalt 10017 and norite 78238 fail to yield consistent geochronologic results among their Pb-Pb, U-Pb, an...

Introduction: Basaltic shergottite Queen Alexandra Range 94201 originated from an extremely depleted mantle source, and has the highest initial εNd (+ 47.6 ± 1.7) and the lowest initial Sr/Sr (0.701298 ± 14) measured for any martian meteorite to date [1]. Rb-Sr and Sm-Nd isochrons for this sample yield concordant crystallization ages of 327 ± 12 Ma and 327 ± 19 Ma, respectively [1]. Knowledge o...