Ingested mineral fibers: elimination in human urine

Science  13 Apr 1979:
Vol. 204, Issue 4389, pp. 195-198
DOI: 10.1126/science.219478


Sediment in human urine examined by transmission electron microscopy contains amphibole fibers which originate from the ingestion of drinking water contaminated with these mineral fibers. The ingestion of filtered water results in the eventual disappearance of amphibole fibers from urine. These observations provide the first direct evidence for the passage of mineral fibers through the human gastro-intestinal mucosa under normal conditions of the alimentary canal.