A sensitive electrode system has been built for measuring in situ sea-surface potenti als from a mobile platform. The initial results of this study point out the patchy nature of the surface films in some "slick" areas as well as in non-"slick" regions, and illustrate the potential usefulness of this technique in measuring film formation and alteration rates.
Williams, P. M., E. S. Van Vleet, and C. R. Booth. 1980. "In situ measurements of sea-surface film potentials." Journal of Marine Research 38, (2). https://elischolar.library.yale.edu/journal_of_marine_research/1506