Strickland, Parsons, Michaels, A., Dow, R., Elardo, K., and Bates, N. (1997) BATS Methods Manual. Version 4. Chapter 21. The Determination of Phosphorus in Sea Water. Chapter available on April 30th, 2024 from https://bats.bios.asu.edu/wp-content/uploads/2017/07/chapter11.pdf