The total alkalinity analysis involves titration. Th e amount of acid used corresponds to the total alkalinity of the sample. A buret is a long, graduated glass tube with a tapered tip like a pipet and a valve that is opened to allow the reagent to drip out of the tube. The amount of reagent used is calculated by subtracting the original volume in the buret from t he volume left after the endpoint has been reached. Alkalinity is calculated based on the amount used.
Titrators forcefully expel the reagent by using a manual or mechanical plunger.
The amount of reagent used is calculated by subtracting the original volume in the titrator from the volume left after the endpoint has been reached. Alkalinity is then calculated based on the amount used or is read directly from the titrator. Digital titrators have counters that display numbers. A plunger is forced into a cartridge containing the reagent by turning a knob on the titrator. As the knob turns, the counter changes in proportion to the amount of reagent used.