Yasuo Izumi, Fumitaka Kiyotaki, Taketoshi Minato, Yoshimi Seida
Anal. Chem., 3819 - 3823, 74(15) (2002).

The local structure of trace amounts of lead in an adsorbent matrix thatwhich contains a high concentration of iron and magnesium (Mg6Fe2(OH)16(CO3)•3H2O) was successfully monitored at the first time by means of X-ray absorption fine structure spectroscopy combined with fluorescence spectrometry. A eutectic mixture of PbCO3 and Pb(OH)2 coagulated when Pb(2+) was adsorbed from a 1.0 ppm aqueous solution, and in contrast, that the major species was ion-exchanged Pb(2+) 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.

Chiba University > Graduate School of Science > Department of Chemistry > Dr. Yasuo Izumi Group