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Toxicity to terrestrial arthropods

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Description of key information

Key value for chemical safety assessment

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One key study is available to estimate toxicity on terrestrial arthropods.

Jensen et al. (2001) studied the effects of DEHP and DBP on the collembolan Folsomia fimetaria. Survival and reproduction on adult individuals were investigated by the use of small microcosms. The organisms were exposed for 21 days to DEHP in moist soil (< 1.5% organic carbon) at the nominal concentrations of 0, 1000, 2000, 3000, 4000 and 5000 mg/kg dw. The DEHP was added in acetone to dry soil and the acetone was evaporated before start of the experiment. Effects of the two phthalates on newly hatched collembolans were also tested during six weeks in a multidish system. The endpoints were juvenile mortality, growth, and development (number of cuticles), the nominal test concentrations were 0, 100, 250, 500, and 1000 mg DEHP/ kg soil (dw).

DEHP had no effect on any of the endpoints at the tested concentrations, maximum 5000 and 1000 mg/kg dwt for adults and juveniles respectively. The study is considered reliable and the unbounded NOEC for the long-term test, starting with juveniles, is hence 1000 mg/kg dwt.

The organic carbon content of the soil in the study was reported to be < 1.5%. If 1.5% is assumed this corresponds to approximately 2.6% organic matter. When applying the equation of normalisation described above on the NOEC (1000 mg/kg) from this study a normalised NOEC of > 1,300 mg/kg dwt is obtained.