![]() ![]() There can be long-term changes in the alkalinity of streams and rivers in response to human disturbances such as acid rain generated by SO x and NO x emissions. It is one of the best measures of the sensitivity of the stream to acid inputs. Moreover, measuring alkalinity is important in determining a stream's ability to neutralize acidic pollution from rainfall or wastewater. Each of these measurements corresponds to an amount of acid added as a titrant.Īlthough alkalinity is primarily a term used by limnologists and oceanographers, it is also used by hydrologists to describe temporary hardness. Alkalinity is expressed in units of concentration, such as meq/L ( milliequivalents per liter), μeq/kg (microequivalents per kilogram), or mg/L CaCO 3 (milligrams per liter of calcium carbonate). ![]() It is measured by titrating the solution with an acid such as HCl until its pH changes abruptly, or it reaches a known endpoint where that happens. Alkalinity is the strength of a buffer solution composed of weak acids and their conjugate bases. It should not be confused with basicity, which is an absolute measurement on the pH scale. ![]() Sea surface alkalinity (from the GLODAP climatology).Īlkalinity (from Arabic: القلوي, romanized: al-qaly, lit.'ashes of the saltwort') is the capacity of water to resist acidification. ![]()
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