Chemical and microbiological examinations of home-water purifiers
Sugita, T.; Ishiwata, H.; Takayama, S.; Ichinoe, M.
Eisei Shikenjo Hokoku. Bulletin of National Institute of Hygienic Sciences 1988(106): 120-123
1988
ISSN/ISBN: 0077-4715 PMID: 3250646 Document Number: 319290
Chemical and microbiological of home-water purifers and activated charcaols packed in them were carried out. Charcaols contained from 0.5 to 2.7 ppm of zinc but not detectable concentration of lead and cadmium. No or less microorganisms was also detected in the charcaols. Migration of silver into water from silver-treated charcaols was between 33 and 79 ppb, but increased to 333 ppb when slight acidified water with diluted nitric acid was used. Silver concentration in the eflfuent from water purifiers when they were attached to faucets was less than 5 ppb though out a 4-week examination period. Microorganisms in effluent increased up to 48 .times. 104 cfu/ml in 200 ml of a forerun after 3 weeks, but decreased to less than 10 .times. 102 cfu/ml or less after 5L of effluent was discarded.