Overview
This study assessed the toxicity of multiple platinum group elements (Pd, Pt, Rh, Ru, Ir) in Hydra vulgaris over 96 hours at concentrations of 0.3 to 100 ug/L, with gene expression profiling to characterize molecular responses. The work addresses the comparative ecotoxicology of PGEs in a freshwater model organism relevant for environmental risk assessment.
Key numbers
- Pd concentrations tested: 0.3, 1, 10, 32, and 100 ug/L
- At 10 ug/L: measured Pd concentration was 60% of nominal (sorption/precipitation in test medium)
- At 100 ug/L: Pd recovery after 48h was 87% (Pt recovery: 43%; Rh: 100%)
- Pd molecular weight: 106.4 g/mol (similar to Rh at 102.9 and Ru at 101.1 g/mol)
- Ir and Pt are heavier (192.22 and 195.1 g/mol respectively)
- Gene expression profiling conducted across all PGE treatments
Methods (brief)
Hydra vulgaris exposed to nominal concentrations of Pd, Pt, Rh, Ru, and Ir for 96 hours. Measured concentrations verified by ICP-MS at 0, 48, and 96 hours. Gene expression profiling by RNA sequencing. Comparative ecotoxicity analysis across all five PGEs tested.
Implications
This page makes the source discoverable for palladium evidence routing. Provides comparative ecotoxicity data for Pd alongside other PGEs in a freshwater model organism, with gene expression endpoints offering mechanistic insight beyond traditional mortality endpoints.
Related evidence
Update history
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