Sonoda, KentKentSonodaHashimoto, YoheyYoheyHashimotoSHAN-LI WANG2021-07-262021-07-2620203615995https://www.scopus.com/pages/publications/85099016102?inwardhttps://scholars.lib.ntu.edu.tw/handle/123456789/572726This study investigated the effects of thermal treatment on the solubility and speciation of lead (Pb) adsorbed on synthesized hematite (Pb-Hm) and in an anthropogenically contaminated soil. The temperature of thermal treatment ranged from 100 to 900 °C, and the speciations of Pb and iron were determined using X-ray absorption fine structure spectroscopy. In Pb-Hm samples, the concentration of water-extractable Pb significantly decreased after being treated at 300 and 600 °C (∼0.50 mg Pb L–1) compared with the untreated sample (9.83 mg Pb L–1). Under this temperature range, about 50% of the Pb-Hm was transformed into massicot (β-PbO). At 700 °C and above, a slight increase of water-extractable Pb was probably caused by the formation of minium (Pb3O4). In the contaminated soil, water-extractable Pb increased gradually from 0.30 to 0.40 mg Pb L–1 with increasing temperature from 25 to 200 °C; then it decreased rapidly to 0.09 mg Pb L–1 at 300 °C and further decreased to 0.004 mg Pb L–1 at 900 °C. Cerussite (PbCO3) and Pb associated with hematite were the major Pb species in the contaminated soil. In the process of thermal treatment, the significant decrease of water-extractable Pb in the contaminated soil was caused by the transformation of cerussite into hematite-associated Pb, accompanied by the transformation from ferrihydrite to hematite.journal article10.1002/saj2.201772-s2.0-85099016102