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Ecotoxicological information

Toxicity to terrestrial plants

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Description of key information

No relevant data on SCCPs is currently availble. Exposure of wheat, oilseed rape and mungbean seedlings during emergence and growth up to 28 days to Cereclor 52 (52% chlorinated) at nominal concentrations up to 5000 mg/kg dry weight of soil had no significant adverse effects. Therefore, the NOEC for these three species is >= 5000 mg/kg dry weight (a measured concentration of about 5800 mg/kg dry weight soil).

Key value for chemical safety assessment

Additional information

No relevant data on SCCPs is currently availble.

In GLP studies conducted according to OECD Guideline 208, the toxicity of Cereclor S52 (a C14-17 chlorinated paraffin; 52% chlorination) at up to nominal concentrations of 5000 mg/kg dry wt soil to seedlings of wheat (Triticum aestivum), oilseed rape (Brassica napus) and mungbean (Phaseolus aureus) was studied during emergence and growth up to 28 days. A small amount of 14C-labelled n-pentadecane (51% chlorinated) was mixed with test substance at the lowest, middle and highest concentrations tested to facilitate analysis in soil and plant tissue (Thompson et al. 2001d). No significant effects were seen on seedling emergence at 14 days and growth up to 28 days with any of the three species in this study, and all seedlings appeared normal, demonstrating that the chlorinated paraffin was not toxic to these species under the conditions of the study. The NOEC for these three species is >= 5000 mg/kg dry wt soil (the highest tested nominal concentration; a measured concentration of 5800 mg/kg dry wt soil).

Studies conducted according to the updated OECD Guideline 208 are designed to assess the potential effects of substances on seedling emergence and growth. Therefore, it is specific to a part of the plant's life-cycle and does not cover chronic effects or effects on reproduction. However, it is assumed to cover a sensitive stage in the life-cycle of a plant and therefore data obtained from this study can be used to estimate chronic toxicity.

In view of the similarities in structure and physiochemical properties [between SCCPs and MCCPs], it can reasonably be predicted that SCCPs would also be of low toxicity to these seedlings.