Recent work on modification of the molybdenum-blue method for determination of dissolved inorganic phosphate in sea water (Wooster and Rakestraw, 1951) showed the need for a simple rugged device sui table for rapid and precise delivery of small quantities of reagents at sea. The two reagents used for phosphat e determination impose addit ional requirements on this device. Molybdic acid solution must be protected from the light and must not be allowed to come in contact with rubber;·stannous chloride solution must be protected from contact with the atmosphere.
Wooster, Warren S., Dayton E. Carritt, and John D. Isaacs. 1951. "An automatic reagent dispenser for shipboard use." Journal of Marine Research 10, (2). https://elischolar.library.yale.edu/journal_of_marine_research/746