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Amount of alkaline minerals (acid binding) that a solution has in the water to neutralize hydrogen ions. It is usually expressed as SBV units (abbreviation of the German term Säurebindungsvermögen) or equivalents of calcium carbonate under the conversion factor of 1 SBV = 50 mg eq. CaCO3/litre. Alkalinity is measured by using methyl orange as an indicator, whose variation in colour at pH 4.2-4.4 indicates, by definition, the complete depletion of alkali. @FAO

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