Rare earth element behavior and Pb, Sr, Nd isotope systematics in a heavy metal contaminated soil

摘要: Abstract The aim of this study is to characterize the processes and phases which control migration retention rare earth elements (REE) in a heavy metal contaminated soil. In addition concentration data, we used Pb, Sr Nd isotopic compositions order distinguish between natural anthropogenic trace metals leached away during sequential extraction procedure. samples were sequentially extracted 3 steps with 1 N acetic acid (HAc), HCl HNO . Pb isotope data showed that had mainly been retained uppermost 10 cm by organic matter topsoil. 87 Sr/ 86 ratios HAc extracts are almost constant indicate soil carbonate derived from regionally outcropping carbonate-rich sediments. Most have more radiogenic compositions, but it unclear whether reflects growing influence or silicate-derived Sr. depth distribution REE controlled two different parameters: pH for extractable Fe Mn oxides extracts. A part was also bound concentrations phase increase increasing pH, indicates they surface hence origin. This confirmed 143 Nd/ 144 show mixing end-member at top an base profile. We assume transported dissolved form as complexes then precipitated downward increased.