This study coated Ethiopian volcanic pumice with zirconium and tested it in fixed-bed columns for removing fluoride from water. The coated material held more fluoride than virgin pumice. The authors describe zirconium as non-toxic, citing earlier work, but did not measure zirconium release into the treated water.
Key numbers
- Fluoride uptake capacity 225 mg/kg for zirconium-coated pumice versus 110 mg/kg for virgin pumice (Abstract; Results, p. 12).
- This paper reports no numerical findings relevant to zirconium exposure.
Methods (brief)
Zirconium coating of pumice, characterization by XRD, ICP-OES, XRF, SEM, BET and FTIR, and fixed-bed column tests with breakthrough set at 1.5 mg/L fluoride.
Evidence fitness
Off-topic for dietary exposure. The paper uses zirconium as a coating on pumice for fluoride removal; it does not support dietary exposure or toxicity claims for zirconium. The breakthrough value of 1.5 mg/L used in the paper is a fluoride value, not a zirconium limit.
Limitations
No zirconium was measured in food, water, soil or human samples, so nothing in the paper describes exposure.
Related evidence
Update history
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