Ionic Strength Adjuster

An ionic strength adjuster (ISA or ISAB) is added to to all standards and samples when using an ion selective electrode. Both standards and samples should be equally diluted. ISAs reduce the margin of error due to ionic strength variations in the water samples. By adding a neutral salt, a constant (high) ionic strength can be maintained, and the variation between solutions becomes very small. "Fixing" the solution with an ISA ensures that the ion selective electrode will measure the concentration of the desired ion, and not the total ionic activity of the solution.

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