The mineral content of Illinois . sure to the air, should not exceed parts per million and per million respectively. Nitrogen as Nitrites.—Xitrogen as nitrites should be absent. Nitrogen as Nitrates.—Nitrogen as nitrates should not exceed per million. Alkalinity.—Alkalinity may vary from 150 to 500 parts per should not exceed 300 parts per million. ^Yaiers from Shallow Wells in the Drift. These waters should be clear without color or odor. Residue on Evaporation.—The total residue on evaporation variesfrom parts per million, ( grains per ga
The mineral content of Illinois . sure to the air, should not exceed parts per million and per million respectively. Nitrogen as Nitrites.—Xitrogen as nitrites should be absent. Nitrogen as Nitrates.—Nitrogen as nitrates should not exceed per million. Alkalinity.—Alkalinity may vary from 150 to 500 parts per should not exceed 300 parts per million. ^Yaiers from Shallow Wells in the Drift. These waters should be clear without color or odor. Residue on Evaporation.—The total residue on evaporation variesfrom parts per million, ( grains per gallon) in a well at Poag,to parts per million, (311 grains per gallon) in a well at CrealSprings. The residue should not exceed 500 parts per million. Chlorine.—Chlorine varies from .3 parts per million in a well at Pana,to 310 parts per million in a well at Bloomington. The majority ofthe waters reported are below 15 parts per million, an amount thatshould not l)e exceeded. STATE GEOLOGICAL SURVEY, 41 BI^LL. NO. PLATE LEGEND PART5PERMILU0M • O - 5 o 5 - lO + 10-20 A 20-50 ^ 50-100 a 100-500 2<^ 500 + Chlorine in water of springs. 42 MINERAL CONTENT OF WATERS. [bull no. 10. Consumed Oxygen.—^Consiimed oxygen should not exceed partsper million. jSitrogen as Free and Alhuminoid Ammonia.—Nitrogen as free andalbuminoid ammonia should not exceed and parts per millionrespectively. Nitrogen as Nitrites.—Nitrogen as nitrites should be absent. Nitrogen as Nitrates.—Nitrogen as nitrates should not exceed per million. All-alinity.—Alkalinity varies from 200 to 500 parts per million, withexceptional cases above or beloAV these limits. The alkalinity shouldnot exceed 300 parts per million. Waters From Deep Drift Wells. Turbidity.—The well waters in the drift are clear when first drawn,but almost invariably become turbid on exposure to the air, due to ox-idation of the iron salts, and to the loss of carbon dioxide. Color.—These w
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