This study made a bayberry tannin foam loaded with zirconium and tested it as an adsorbent for fluoride and lead in water and as an amendment in acidic tea garden soil. It shifted fluoride and lead toward less reactive soil fractions. Zirconium itself was not measured in soil, water or tea plants.
Key numbers
- Adsorption capacities from water: 5.02 mg/g for lead and 4.55 mg/g for fluoride (Abstract).
- This paper reports no numerical findings relevant to zirconium exposure.
Methods (brief)
Material synthesis from tannin foam and zirconium sulfate, adsorption kinetics and isotherms in water, and a 60-day soil incubation with sequential extraction of fluoride and lead fractions.
Evidence fitness
Off-topic for dietary exposure. The paper uses zirconium as an adsorbent to immobilize fluoride and lead; it does not support dietary exposure or toxicity claims for zirconium. The paper did not report whether zirconium was released into water or soil.
Limitations
Laboratory and pot-scale work; no measurement of zirconium release from the material or of zirconium, fluoride or lead in tea leaves.
Related evidence
Update history
No substantive edit history is available in this build. The full commit record is available in git.