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Toxicity to soil macroorganisms except arthropods

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Key value for chemical safety assessment

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In total, 16 chronic data are available for 3 different species of non-arthropod soil invertebrates exposed to natural EU and North American soils. Reliable chronic NOEC/EC10 values for reproductive success range from 52 to 1091 mg added Co/kg dw, both results observed for reproduction by the pot worm Enchytraeus albidus (De Schamphelaere et al, 2008). Below are the accepted high quality studies for non-arthropod soil macro-organisms, for both the added cobalt and total cobalt values, used to calculate a geometric mean for derivation of the HC5 and terrestrial PNEC.

High quality studies for non-arthropod soil macro-organisms used for derivation of the HC5 and terrestrial HC5

       Selected values for the most sensitive endpoints used for deriviation of the terrestrial HC5  Key study
 Species Added NOEC or EC 10 (mg Co/kg dw)  Total NOEC or EC 10  (mg Co/kg dw)  
 Eisenia fetida  56 -426  58 -437  De Schamphelaere at al., 2008
 Enchytraeus albidus  52 -1091  53 -1121  De Schamphelaere et al.; 2008
 Eisenia andrei  55  58  Velicogna et al., 2010

Value used for CSA: Long-term EC10/LC10 or NOEC for soil non-arthropods: 52 -1091 mg/kg soil dw (added Co).