Where It Comes From
Naturally in rocks, coal, and zinc ores; released by coal burning and metal refining; used in semiconductors, fiber‑optic cables, and specialty glass [1].
How You Are Exposed
Breathing dust or fumes at work; swallowing from high‑dose “supplements”; small amounts in some foods and water; skin contact with contaminated dust [1][3].
Why It Matters
Long‑term ingestion of some germanium compounds has caused kidney damage and nerve problems; inhaling dust can irritate eyes and lungs. IARC has not evaluated elemental germanium for carcinogenicity [1][2].
Who Is at Risk
Workers in electronics, fiber‑optics, metal refining, and recycling; people taking germanium supplements; individuals with existing kidney disease [1][3].
How to Lower Your Exposure
Avoid non‑prescribed germanium supplements; at work, use ventilation, PPE, and good hygiene to control dust/fumes; follow safety training and medical monitoring; handle and recycle e‑waste properly [1][3].
References
- [1]ATSDR. Toxicological Profile for Germanium. Agency for Toxic Substances and Disease Registry.
- [2]IARC. Agents Classified by the IARC Monographs, Vols. 1–134 (list of classifications).
- [3]CDC/NIOSH. Pocket Guide to Chemical Hazards: Germanium and compounds (as Ge).