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...

The hadron collider studied in the future circular collider (FCC) project could operate with protons and lead ions in similar operation modes as the LHC. In this paper the potential performances in lead-lead, proton-lead, and proton-proton collisions are investigated. Based on average lattice parameters, the strengths of intrabeam scattering and radiation damping are evaluated and their effect ...

Pb(III) sorption to hydrous amorphous SiO2 was studied as a function of pH and ionic strength using XAS to characterize the sorption products formed. Pb sorption increased with increasing pH and decreasing ionic strength. The XAS data indicated that the mechanism of Pb(II) sorption to the SiO2 surface was pH-dependent. At pH < 4.5, a mononuclear inner-sphere Pb sorption complex with ionic chara...

Although Japan has been considered to have little lead (Pb) pollution in modern times, the actual pollution situation is unclear. The present study aims to investigate the extent of Pb pollution and to identify the pollution sources in Japan using stable Pb isotope analysis with kidneys of wild rats. Wild brown (Rattus norvegicus, n = 43) and black (R. rattus, n = 98) rats were trapped from var...

A pseudo-boolean constraint (PB-constraint) is a linear inequality with 0-1 variables and integer coefficients. Search problems can be modeled as sets of PB-constraints, so that, solutions to a set of PB-constraints map to solutions of the search problem. An optimization problem can be modeled using a set of PB-constraints along with an optimization statement over a set of 0-1 variables. Pseudo...

The addition of lead salts to phosphate-containing Chlamydomonas reinhardtii media caused precipitation of Pb(3)(PO(4))(2), effectively removing phosphate from solution. The effect of Pb(2+) on growth of Chlamydomonas in liquid cultures depended strictly on the ratio of the equivalents of Pb(2+) to phosphate present. When the amount of Pb(2+) approached equivalency with phosphate, cell growth w...