X-ray absorption fine structure combined with fluorescence spectrometry for monitoring trace amounts of lead adsorption in the environmental conditions.
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.
Izumi
Yasuo
Y
Department of Environmental Chemistry and Engineering, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, Yokohama, Japan. izumi@chemenv.titech.ac.jp
Kiyotaki
Fumitaka
F
Minato
Taketoshi
T
Seida
Yoshimi
Y
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
D002254:Carbonates; D004785:Environmental Pollutants; D006878:Hydroxides; C432863:lead hydroxide; D007854:Lead; C043262:lead carbonate