Speciation of Zinc Metal in Paddy Soils by Chemical Sequential Extraction and Synchrotron X-ray Spectroscopy

摘要

A severely zinc-contaminated paddy soils were collected and analyzed by the chemical sequential extraction and synchrotron X-ray spectroscopy. Results show that Zn, Pb and Cu were the major heavy metals in paddy soils. The carbonates and Fe-Mn oxide fractions were the main form for Zn whereas a considerable residual fraction was detected for Pb. In addition to Zn-O, many bonding structures between zinc and other metals were also examined. The possible species of zinc would be Zn-Al(Si) with a bonding distance of 2.18 A and a Zn-Fe structure with a bonding distance of 3.07 A.