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Ecotoxicological information

Toxicity to soil macroorganisms except arthropods

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Seven reliable chronic NOEC or EC10 values are selected for 3 annelid worm species, ranging from 130 mg Pb/kg dwv for hatching success of Dendrobaena rubida to 3000 mg Pb/kg dw for mortality of Eisenia fetida.
Similar toxicity tests are reported in different source documents (i.e. using the same organism, endpoint, soil and test conditions). For these cases, a geometric mean value is calculated. Two geometric mean values are calculated for tests with invertebrates.
• A geometric mean value is calculated based on 2 results for reproduction of Eisenia fetida in an OECD artificial soil (Spurgeon and Hopkin, 1995: NOECr = 608 mg/kg; Spurgeon et al., 1994: NOECr = 1822 mg/kg). The geometric mean is 1053 mg Pb/kg dw in the total risk approach.
• The second geometric mean value is calculated based on 2 results for reproduction of Eisenia fetida in a silt loam soil (Davies et al., 2002: NOECr = 400 mg/kg; Davies et al., 2003b: NOECr = 625 mg/kg). The geometric mean is 500 mg Pb/kg dw.
In total 5 NOEC or EC10 values for soft-bodied soil invertebrates are taken forward to the PNEC derivation.

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