Methodology of the derivation of precautionary soil values for HCH and trigger values for the pathway soil-plant according to the german soil protection regulations
2008
Terytze, K. | Herrchen, M. | Tarita, A.
According to the German Federal Soil Protection Act the natural function of soil as a habitat for human beings, animals, plants and soil organisms as well as the production function is among others to be protected by deriving soil values for important chemicals regarding their amounts in the environment, their persistence and/or their toxicity. So the Federal Soil Protection Act of 1998 and its Federal Soil Protection and Contaminated Sites Ordinance (BBodSchV) of July 12th, 1999 contain precautionary values and trigger values for the protection of soil functions. For both criteria there are values for HCH whose derivation is explained. Trigger values are related to various soil uses and objectives of protection, which are"human health","quality of food and feed", and"leachate to groundwater". Any procedure to derive trigger values for the objective"quality of food and feed" has to consider the soil-plant transfer of chemicals for soils under agricultural use and household gardens. Thus, the production function of soil is taken into account. For precautionary values especially the habitat function of soil for micro- and macroorganisms plays an important role because reduction and transformation processes in soil are a common performance of soil organisms as well as chemical and physical soil properties-80 percent of substantial transformation processes in soil are related to soil flora and fauna. A final recommendation for legally binding soil values includes a plausibility check of the mathematically derived values as well as with natural background concentrations, soil values for other pathways and soil values used in legislation of other countries, which will be discussed.
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