Abstract
Multielement determination of major-to-trace elements in leachate samples from industrial waste incineration fly ash (IWIFA) was carried out by ICP-AES and ICP-MS. Two kinds of IWIFA samples were leached with pure water and 0.1 M HNO3 solution, and about 50 elements at the major-to-ultratrace level (mg/cm3 to ng/cm3 ) in the IWIFA leachate were determined with the relative standard deviations less than 10 %. Using the total content data of the elements in IWIFA samples, the leachabilities and enrichment factors of the elements were obtained. The leachability of each element was found to be strongly dependent on the final pH of the leachate. Moreover, the elements which exist as stable oxides in fly ash hardly leached. The leaching behaviors of the elements associated with final pH of the leachate were categorized into several groups, such as alkali elements, alkaline earth elements, major lithophile and major siderophile elements, trace lithophile elements, trace siderophile elements, oxoanion-forming elements, and trace chalcophile elements. These results suggest that the leaching behaviors of the elements in fly ash are significantly dependent on their chemical properties as well as their chemical species in fly ash.
