Scripps Institution of Oceanography total alkalinity titration system
|Within Vocab||SeaVoX Device Catalogue|
|Alternative Labels||Scripps TA titration system|
|Definition||A laboratory titration system designed to measure the total alkalinity of discrete seawater samples. The system is based on the Metrohm 876 Dosimat Plus, with a calibrated 5 ml exchange unit. It also uses an Agilent 34970A Data Acquisition/Data Logger Switch Unit with a custom-made unity gain amplifier. The recommended pH electrode is the Metrohm Ecotrode Plus. The system uses a potentiometric titration method: The sample is acidified to a pH of 3.6. The evolved CO2 is removed, and the titration continues to a pH of 3. The equivalence point corresponding to the total alkalinity is evaluated from titration points in the pH region 3.0 to 3.5 using a non-linear least-squares procedure. This corrects for the reactions with sulfate and fluoride ions present in the seawater. The system includes a desktop computer with LabVIEW 2013 software. Recommended titration temperature is 20 degC. Sample volume is 125 ml. Initial start-up takes approximately 1 hour, with a measurement throughput of 4 - 6 per hour. Power line frequency is 60 Hz.|
|Has Current Version||1|
||Scripps Institution of Oceanography||Mapping: 1742338|
||Scripps Institution of Oceanography||Mapping: 1742340|
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