Sorption of dimethylselenide by soils |
| |
| Authors: | R Zieve PJ Peterson |
| |
| Institution: | Department of Biological Sciences, Chelsea College, University of London, Hortensia Road, London SW10 0QR, U.K. |
| |
| Abstract: | Air-dry and moist soils were shown to possess the capacity to sorb substantial amounts of (75Se)dimethylselenide produced by the yeast Candida humicola in culture, or by soil supplied with (75Se)selenite, depending largely upon the organic matter content and selenium concentration of the soils. The sorption capacities of individual soil constituents followed the order; organic matter > clay minerals > manganese oxides > iron oxides > acid-washed sand.A chemical fractionation procedure applied to soils fumigated with (75Se)dimethylselenide revealed that the majority of the selenium sorbed was converted after 1 month to other forms, extractable mainly with strong acid solutions. Experiments with sterilized (autoclaved and γ-irradiated) soils indicated that soil microorganisms played little, if any, part in the sorption process.The work reported here indicates that soil is an important natural “sink” for atmospheric dimethylselenide. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
