Fate and bioavailability of pyrene and lindane in sterile artificial and real soils
| Authors | |
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| Year of publication | 2011 |
| Type | Conference abstract |
| MU Faculty or unit | |
| Citation | |
| Description | Artificial soil is considerably different from real soil despite it was developed to serve as lmodel soilr in soil toxicity tests. From our earlier studies, it is apparent that organic carbon is not only determinant of pollutants fate, bioavailability and toxicity. Despite of this fact, some methodologies still use organic carbon for direct recalculation of toxicity or risk between different soils, i.e. also between artificial and real soils. This assumption might lead to the final risk under- or over-estimation. Differences between artificial and natural soils are caused not only by components proportion (i.e. relatively high total organic carbon content) but also by their character n peat and kaolin clay are the most critical components affecting the fate of contaminants. This study is posing claim to investigate the differences in bioavailability of selected POPs between artificial and natural soils and its changes in time. Three natural soils were used with different total organic carbon content (TOC): arable soil (1.2%), grassland soil (3.5%) and forest soil (10.2%), and three artificial soils were prepared to have the same TOC as these real soils. Soils were sterilized to avoid the influence of microbes, and contaminated by radiolabelled 14C-pyrene and 14C-lindane. Total activity, DCM and HPCD extraction and bioaccumulation in earthworms Eisenia fetida was measured after 1, 14, 28 and 56 days. According to results it is clear that i) decline of bioavailability of selected compounds in time was less evident in sterile soils than in non-sterile soils studied in the past, ii) bioaccumulation and extractability showed different trends for pyrene and lindane, and iii) differences between artificial and natural soils were observed however they had the same TOC. These conclusions are in accordance with previous studies which also reported than not only organic carbon content (TOC) but also its character and other soils properties must be seriously considered in artificial to real soil extrapolation. |
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