X-ray absorption spectroscopic investigations on cobalt speciation and ageing in soils
(0) The environmental risk posed by cobalt (Co) contamination is largely a function of its oxidation state in soil and water. The objective of our work was to assess the potential biological availability of Co over time in a range of soils with varying physical and chemical characteristics. Previous studies indicate that soil pH and the presence of Mn, Fe and Al oxides significantly affect Co speciation, fate and bebaviour in soils. In the present study, we examined changes in Co speciation and sorption mechanisms over time in selected soils ranging in pH from 4.7 to 7.5, and exhibiting oxalate-extractable Mn oxide contents between 70 and 2239mg·kg<-10>. Solid- state CO speciation was assessed using x-ray absorption near-edge structure (XANES) and fine structure (XAFS) spectroscopy. Differences were observed between spectra obtained for different soils, and between aged soils and those freshly spiked with aqueous Co<2+>.
cobalt speciation ageing bioavailability
Laura A. Wendling Ganga M. Hettiarachchi Jason K. Kirby Michael J. McLaughlin
CECR CSIRO Land and Water, PMB 2, Glen Osmond South Australia 5064, Australia
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
999-1000
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）