This greenhouse pot trial grew a grass (Holcus lanatus) and a wild rocket species (Diplotaxis tenuifolia) through their life cycle in substrate amended with 200 mg/kg cerium oxide nanoparticles of two sizes. Roots took up cerium strongly, especially from the smaller particles, while movement to leaves was limited and species-dependent.
Key numbers
- Substrate cerium after treatment: 290 mg/kg (p. 6).
- Root cerium (µg/kg dry weight, mean plus or minus SD): controls 822 (grass) and 305 (wild rocket); with 25 nm particles 16,079 and 9,392; with 50 nm particles 5,273 and 3,037 (Table 1, p. 7).
- Leaf cerium in wild rocket (µg/kg dry weight): control 145 plus or minus 158; 25 nm 99.6 plus or minus 129; 50 nm 1,044 plus or minus 195 (Table 1, p. 7).
- A small dissolved cerium fraction (7.07 µg/L) was detected in digests examined by single-particle ICP-MS (p. 4).
Methods (brief)
Plants were grown for their full cycle in amended substrate; roots were acid-washed; tissues were digested and analyzed for total cerium, and single-particle ICP-MS characterized particles in roots and leaves.
Evidence fitness
Supports statements on cerium uptake and limited translocation to leaves in two non-crop species. It does not describe crop or market food levels.
Limitations
Single dose; large variability in leaf values; wild species framed by the authors as non-food plants; four replicates.
Related evidence
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