Determination of Potassium in Sea Water Seawater has high ionic strength. To eliminate matrix e?ect in measuring potassium (K+) concentration, standard solutions made with the same background as the seawater sample are recommended for calibration. The result of measurement using the LAQUAtwin Potassium Ion meter is within ±10% of typical seawater concentration. Introduction Seawater is a complex solution of di?erent ions with di?erent charges. Matrix e?ect can be eliminated or reduced by either standard addition method or standard calibration solutions made with the same background matrix as the sample. The former technique is challenging in onsite testing. It has been known that the composition of sea water throughout the mass of the oceans is relatively constant, and that, whatever the d

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