Alkalinity is an important parameter for understanding the carbonate system in sea water. It is a parameter that can be combined with additional parameters, e.g., pH, CO2, or dissolved inorganic carbon (DIC), to determine other parameters. 

Alkalinity measurements could be done with two titrator systems:

 

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Apollo SciTech's AS-ALK2

Automates the titration procedure by controlling titration and standardization,and the calculation of the final result. This system uses small sample volumes (5-25 mL) with high precision (0.1%). This allows for fast throughput of samples. It also provides full scale pH titration and full temperature control.


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Metler Toledo Autotritator M50

Measurements can be taken in an open flask after calibrating the electrode pH 4.4 (scale NBS) by utilizing potassium phthalate buffer borax. By interleaving steps of Certified Reference Material (CRMs) between samples, this method can achieve precisions and accuracies of the order of 1-2 mol / kg micro.