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Ecotoxicological information

Long-term toxicity to aquatic invertebrates

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Description of key information

The 21-day LC50 of hexachloroplatinic acid for Daphnia magna was determined to be 520 μg Pt L-1. The 21 -day EC50 and EC16 of hexachloroplatinic acid for the reproductive impairment of Daphnia magna were determined to be 82 μg Pt L-1, and 14 μg Pt L-1, respectively. The NOEC is estimated to be 7.0 μg Pt L-1.

Key value for chemical safety assessment

Additional information

For platinum(IV) substances there is some evidence that substances containing a chloro ligand are more toxic than those without a chloro ligand. For this reason, for substances without a chloro ligand, read across for REACH endpoints and for classification purposes is only conducted with other substances that do not contain a chloro ligand. However, for risk assessment purposes measured platinum concentrations in the environment only allow assessment of total platinum concentrations and do not differentiate between the form of the platinum in the environment. The PNEC for platinum(IV) substances is therefore based on pooled ecotoxicity data for all platinum(IV) substances, regardless of the ligands, and is based on the most toxic substance. For platinum(IV) substances the most toxic substance is hexachloroplatinic acid and the PNECs for platinum(IV) substances are therefore based on data for this substance. The key study driving the aquatic PNECs for platinum(IV) substances is a chronic Daphnia study for hexachloroplatinic acid.

 

The chronic toxicity of hexachloroplatinic acid to Daphnia magna was assessed in a publication (Biesinger and Christensen 1972), where the effects of various metals on survival, growth, reproduction and metabolism ofDaphnia magnawere investigated. The study is acceptable with restrictions. The study does not follow a standard test guideline although the methods used are described. A semi-static test of 21 days was conducted. Twelve concentrations of the test item were used. No analytical verification of test concentrations was conducted for platinum. The 21-day LC50 of hexachloroplatinic acid for Daphnia magna was determined to be 520 μg Pt L-1. The 21 -day EC50 and EC16 of hexachloroplatinic acid for the reproductive impairment of Daphnia magna were determined to be 82 μg Pt L-1, and 14 μg Pt L-1, respectively. The NOEC was not stated in the publication, but is estimated to be 7.0 μg Pt L-1, calculated by the ratio of EC16/2.