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WATER CHEMISTRY. Chemical composition of waters is expressed in terms of major anion and cation contents.Major Cations: Na , K , Ca , Mg Major Anions: HCO3- (or CO3=), Cl-, SO4=HCO3- ? dominant in neutral conditionsCO3= ? dominant in alkaline (pH>8) conditionsH2CO3 ? dominant in acidic condi
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