Introduction Seawater is a complex solution of different ions with different charges. Matrix effect 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 degree of concentration or dilution, the ratios between the concentrations of the major components vary, if at all, between narrow limits. Potassium (K) is one of the major components in seawater. The concentration is 380mg/L K+ in typical seawater. The pocket-sized LAQUAtwin Potassium Ion meter can be used directly in seawater to measure th

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