Overview
This study characterized the biodynamics of platinum group elements (PGEs) in freshwater Chaoborus aquatic larvae, measuring assimilation efficiency, elimination rate constants, and internalized uptake rate constants for Pd and Pt. It also compiled environmental PGE concentrations from urban Quebec rivers and Gothenburg sediments, finding dissolved Pd near detection limits and elevated sediment Pd in urban areas.
Key numbers
- Pd assimilation efficiency (AE) in Chaoborus: 5.6-32.4% (SE 9-11%)
- Pd elimination rate constant (ke): 0.69 +/- 0.19 per day
- Pt elimination rate constant (ke): 0.51 +/- 0.17 per day
- Internalized Pd uptake rate constant (kuw): 3.5 +/- 0.5 mL/g/day
- Dissolved Pd in urban Quebec rivers: 0.085-0.29 ng/L (at detection limits)
- Urban river sediment Pd (Gothenburg, Sweden): 155 +/- 73 ng/g
- Pd is more rapidly assimilated and eliminated than classic toxicants (Ni ke: 0.19/day; cadmium (Cd) ke: approximately 0.011/day)
Methods (brief)
Biodynamics experiments using Chaoborus larvae exposed to radiolabeled or stable Pd and Pt isotopes. Assimilation efficiency measured from dietary uptake; elimination rate constants from depuration curves. Environmental samples collected from Quebec urban rivers and from published Gothenburg sediment data. ICP-MS for dissolved and sediment concentrations.
Implications
This page makes the source discoverable for palladium evidence routing. Provides quantitative biodynamic parameters for aquatic invertebrate Pd uptake and elimination in a freshwater context, with supporting environmental concentration data showing current urban dissolved Pd at or near detection limits.
Related evidence
Update history
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