Problem of correction of hygienic standards with special reference to the hardness of drinking water
Plitman, S.I.; Novikov, I.V.; Tulakina, N.V.; Mete'lskaia, G.N.; Kochetkova, T.A.; Khvastunov, R.M.
Gigiena i Sanitariia 1989(7): 7-10
1989
ISSN/ISBN: 0016-9900 PMID: 2529186 Document Number: 333483
When hardness of water is less than 2.2 mg-eq/l the concentration of arsenic of 0.05 mg/l and aluminum of 0.5 mg/l are regarded as threshold. Subthreshold levels do not exceed 0.01 and 0.1 mg/l, respectively. Silicon concentration of 25 mg/l is absolutely safe when using water with hardness of less than 2.5 mg-eq/l.