Effects of incubation time and filtration method on Kd of indigenous selenium and iodine in temperate soils
| Autor: | T. Almahayni, Elizabeth H. Bailey, George Shaw, Neil M.J. Crout |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Health
Toxicology and Mutagenesis chemistry.chemical_element 010501 environmental sciences Iodine Soil solution = extraction 01 natural sciences Incubation period Incubation time Distribution coefficient (Kd) Desorption Temperate climate Environmental Chemistry Soil indigenous selenium and iodine Waste Management and Disposal 0105 earth and related environmental sciences Soil organic matter 04 agricultural and veterinary sciences General Medicine Pollution Partition coefficient chemistry Environmental chemistry Soil water Rhizon soil moisture samplers 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Selenium |
| ISSN: | 0265-931X 1879-1700 |
| Popis: | In this study, the effects of incubation time and the method of soil solution extraction and filtration on the empirical distribution coefficient (Kd) obtained by de-sorbing indigenous selenium (Se) and iodine (I) from arable and woodland soils under temperate conditions were investigated. Incubation time had a significant soil- and element- dependent effect on the Kd values, which tended to decrease with the incubation time. Generally, a four-week period was sufficient for the desorption Kd value to stabilise. Concurrent solubilisation of soil organic matter (OM) and release of organically-bound Se and I was probably responsible for the observed decrease in Kd with time. This contrasts with the conventional view of OM as a sink for Se and I in soils. Selenium and I Kd values were not significantly affected by the method of soil solution extraction and filtration. The results suggest that incubation time is a key criterion when selecting Se and I Kd values from the literature for risk assessments. Values derived from desorption of indigenous soil Se and I might be most appropriate for long-term assessments since they reflect the quasi-equilibrium state of their partitioning in soils. |
| Databáze: | OpenAIRE |
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