Tracer monitored titrations: measurement of total alkalinity

Analytical Chemistry
Todd R MartzMichael D DeGrandpre

Abstract

We introduce a new titration methodology, tracer monitored titration (TMT), in which analyses are free of volumetric and gravimetric measurements and insensitive to pump precision and reproducibility. Spectrophotometric monitoring of titrant dilution, rather than volume increment, lays the burden of analytical performance solely on the spectrophotometer. In the method described here, the titrant is a standardized mixture of acid-base indicator and strong acid. Dilution of a pulse of titrant in a titration vessel is tracked using the total indicator concentration measured spectrophotometrically. The concentrations of reacted and unreacted indicator species, derived from Beer's law, are used to calculate the relative proportions of titrant and sample in addition to the equilibrium position (pH) of the titration mixture. Because the method does not require volumetric or gravimetric additions of titrant, simple low-precision pumps can be used. Here, we demonstrate application of TMT for analysis of total alkalinity (A(T)). High-precision, high-accuracy seawater A(T) measurements are crucial for understanding, for example, the marine CaCO3 budget and saturation state, anthropogenic CO2 penetration into the oceans, calcareous phytopl...Continue Reading

References

Nov 15, 1990·Analytical Chemistry·K C NgJ D Winefordner
Apr 26, 2003·Analytical Chemistry·Todd R MartzMichael D DeGrandpre
Jul 17, 2004·Science·Christopher L SabineAida F Rios

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Citations

Aug 24, 2013·Environmental Science & Technology·Quanlong LiKatherine A Hoering
Jul 23, 2014·Environmental Science & Technology·Reggie S SpauldingTerry R Hammar
Dec 26, 2015·Analytica Chimica Acta·Milton K SasakiElias A G Zagatto
Oct 18, 2015·The Science of the Total Environment·Yimin ChenSeetharaman Vaidyanathan
Apr 9, 2014·Environmental Science & Technology·Robert H Byrne
Nov 30, 2011·Analytical Chemistry·Todd MartzPhilip Bresnahan
Nov 10, 2011·Analytical Chemistry·Michael D DeGrandpreAnna G Bahnson
Aug 30, 2008·Journal of Psychoactive Drugs·O Hayden GriffinDavid N Khey
Apr 2, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Joanna KozakPaweł Kościelniak
Sep 5, 2018·Environmental Science & Technology·Rohini AthavaleAndreas Brand

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