Zinc in relation to hygiene
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J.S.H.
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Article
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1934
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Elsevier Science
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English
โ 58 KB
Zinc in Relation to Hygiene.--CECIL K. DRINKER AND LAWRENCE T. FAIRHALL (Public Health Rep., I933, XLVIII,) consider that an upper permissible limit of 5 parts of zinc per million in drinking water is too low ; a limit of 30 parts per million is suggested. In water, zinc salts reveal their presence