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เอกสารมาตรฐาน
สหรัฐอเมริกา
APHA
SMWW 4500-CO2
Carbon Dioxide
2023
6
Standard methods for the examination of water and wastewater (543.3 APHA 24th ed. Ref. Treatises&monographs FL2)
Surface waters normally contain less than 10 mg free carbon dioxide (CO2) per liter, whereas some groundwaters may easily exceed that concentration. The CO2 content of a water may contribute significantly to corrosion. Recarbonation of a supply during the last stages of water softening is a recognized treatment process. The subject of saturation with respect to calcium carbonate is discussed in Section 2330.