title: X-ray absorption fine structure combined with fluorescence spectrometry for monitoring trace amounts of lead adsorption in the environmental conditions.
abstract: The local structure of trace amounts of lead in an adsorbent matrix that contains a high concentration of iron and magnesium (Mg6Fe2(OH)16(CO3) x 3H2O) was successfully monitored by means of X-ray absorption fine structure spectroscopy combined with fluorescence spectrometry. A eutectic mixture of PbCO3 and Pb(OH)2 coagulated when Pb2+ was adsorbed from a 1.0 ppm aqueous solution, and in contrast, the major species was ion-exchanged Pb2+ in the case of adsorption from a 100 ppb aqueous solution. The difference was ascribed to the balance between the precipitation equilibrium for coagulation and the rate of the ion exchange reaction with surface hydroxyl groups.
authors.affiliation: Department of Environmental Chemistry and Engineering, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, Yokohama, Japan. izumi@chemenv.titech.ac.jp
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Izumi
authors.forename: Fumitaka
authors.initials: F
authors.lastname: Kiyotaki
authors.forename: Taketoshi
authors.initials: T
authors.lastname: Minato
authors.forename: Yoshimi
authors.initials: Y
authors.lastname: Seida
mesh_terms: D002254:Carbonates; D011232:Chemical Precipitation; D004785:Environmental Pollutants / Q000032:analysis*; D006878:Hydroxides; D007854:Lead / Q000032:analysis* / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D013057:Spectrum Analysis; D014965:X-Rays
chemical_list: D002254:Carbonates; D004785:Environmental Pollutants; D006878:Hydroxides; C432863:lead hydroxide; D007854:Lead; C043262:lead carbonate