Estimation of Low-Level Carbonate Alkalinity from Single Endpoint Acidimetric Titration to Ph = 4.5
Fundamental and Applied Limnology(2021)
摘要
An established method for determining alkalinity is acidimetric titration to a single endpoint of pH = 4.5, which for dilute carbonate buffersystems is below the equivalence pH. Here we demonstrate that a formula commonly used to adjust for this over-titration itself leads to a significant overestimation of the alkalinity. Applied on a large data set from southwestern Norway, this formula caused an alkalinity overestimation of 10 %. Calculations of CO2(aq) based on these alkalinity data yielded similar overestimation. We propose an adjustment of the alkalinity formula to minimize this error.
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关键词
equivalence alkalinity,single endpoint titration,overestimation,historical CO2-values
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