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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

The 72-hour EC50 values for inhibition of growth rate and yield were determined to be 6.626 mg Pt L-1 and 2.239 mg Pt L-1, respectively. The 72 -hour EC10 values for inhibition of growth rate and yield were determined to be 1.98 mg Pt L-1 and 0.778 mg Pt L-1, respectively. The NOEC was determined for yield to be 0.613 mg Pt L-1.

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An algal growth inhibition study was conducted with Pseudokirchneriella subcapitata for dihydrogen hexahydroxyplatinate following OECD guideline 201 (Wenzel 2014). Five test concentrations were used and these were analysed using ICP-OES. Results were based on geometric mean measured concentrations, since the concentration of the test item decreased more than 20 % of the measured initial concentration throughout the test. The 72-hour EC50 values for inhibition of growth rate and yield were determined to be 10.225 mg L-1 (6.626 mg Pt L-1) and 3.45 mg L-1 (2.239 mg Pt L-1), respectively. The 72 -hour EC10 values for inhibition of growth rate and yield were determined to be 3.06 mg L-1 (1.98 mg Pt L-1) and 1.20 mg L-1 (0.778 mg Pt L-1), respectively. The NOEC was determined to be 0.946 mg L-1 for yield, equivalent to 0.613 mg Pt L-1.