A method for determining the amount of potassium in ocean water has been described. With this procedure, a number of ocean water samples have been analyzed for potassium, and the potassium-chlorinity ratios have been calculated. The ratio has been found to have a constant value of 0.02023 with a standard deviation of 0.000,032 or 1.6 parts per 1,000.
Jentoft, Ralph E., and Rex J. Robinson. 1956. "The potassium-chlorinity ratio of ocean water." Journal of Marine Research 15, (2). https://elischolar.library.yale.edu/journal_of_marine_research/871