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Product Name: Total Alkalinity Titration System

model AS-ALK2


1. Mode: automated open cell Gran titration

2. Typical sample consumption range: 10 – 25 mL per analysis

3. Time consumption: 7 – 10 minutes

4. Precision: better than ± 0.1% or ± 2 μM for seawater

5. Work environment: shipboard or land-based laboratory

6. Power requirement: 100 – 240 VAC

7. Size: 11” H × 9” D × 12” W



The AS-ALK2 total alkalinity titrator consists of two high precision digital pumps (adjustable from 1 to 25 mL) for precise delivery of reagent and sample solutions (Kloehn, USA), a research quality pH meter (Fisher Thermo Orion, USA), and combination glass pH electrode (Orion, USA). A laptop PC is also included as part of the data acquisition unit.

The AS-ALK2 total alkalinity titrator has been tested in a variety of aquatic conditions such as in river and lake waters, coastal and open ocean waters, sediment porewater, and groundwater. This system is unique in that it automates the Gran (linear) titration method with high precision (± 0.1%). Further, it is built and tested for shipboard use. To ensure high quality data, a water bath should be used to help maintain a constant temperature throughout the titration analysis. This model is not available from any other commercial source.

If the sample volume is small or not sufficient enough to rinse/flush the sample (left) syringe of the previous solution, it is possible to use the titrator without the sample syringe. In this circumstance, an analytical balance is used to weigh the sample. The amount is then keyed into the program before the automated titration is initiated. Final alkalinity values are calculated via internal software.


On October 10th, 2016, the same coastal seawater was repeatedly tested (20 measurements) using sample volumes of 20 mL. Seawater was collected at the Indian River Inlet, southern Delaware, USA. The coefficient of variation for all test measurements was 0.081%. Therefore, results better than ± 0.1% are possible if multiple analyses for the same water sample are performed under stable room temperature conditions.


Manufacturer: Apollo, USA

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