Leadership

CHLORINE IN MOST NATURAL WATERS

Issue 15 and Volume 43.

CHLORINE IN MOST NATURAL WATERS Chlorine, a constituent of common salt, is present in nearly all natural waters. Its original sources are mineral salt deposits and finely divided salt spray from the sea. This latter is carried with dust particles by the wind and precipitated with the rain. Ail salt found in waters not coming from these original sources comes from domestic drainage and indicates either that the water is at the present time polluted or was polluted and has since been purified. By a com patison of the salt-content of any water under examination with the normal chlorine figure for that region the extent of past or present pollution may be determined. Salt always occurs in dtainage from animal sources, because in all animal economy a certain fairly definite amount of common salt is eaten with the food daily and later expelled from the body in practically the same…

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