Online hardness analysers are commonly used to monitor brine solutions and various water processes (e.g. drinking water).
Hardness can be measured using a titration or a photometric method. With the titration method both calcium and magnesium hardness can be measured separately.
Avoiding clogged pipes
Scale build-up in water appliances leads to clogging and failure.
Hard water contributes to inefficient and costly operation of water-using appliances. Heated hard water forms a scale of calcium and magnesium minerals that will over time reduce efficiency and ultimately lead to failure of water-using appliances. Pipes can become clogged with scale thus reducing water flow and will require replacement.
Application Bulletin No.125/2e
The Application Bulletin No.125/2e describes a potentiometric method for the simultaneous complexometric determination of the calcium and magnesium ions in a sample with Na2EDTA as titrant.
The Ca-ISE is used for indication.
For a better differentiation of the Ca and Mg potential jumps an auxiliary complexing agent is used that masks Fe3+ and Al3+ simultaneously.
Fixing the pH value at pH 8.5 prevents disturbances that could appear through precipitation of CaCO3.
In water samples the method is suitable for the automatic determination of all hardnesses (carbonate, Ca, Mg, total and permanent hardness).
The determination of Ca and Mg in beverages (fruit and vegetable juices, wine) is also described.
Metrohm Process Analysers
Metrohm Process Analysers have a very extensive self-diagnostics to prevent faulty readings and hardware failures. Analyser’s typical annual uptime is 99%.
