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Nutrient methods.
(California Cooperative Oceanic Fisheries Investigation, La Jolla, CA, 2015)
The phytoplankton macro nutrients nitrate, nitrite, silicate, and phosphate in seawater are analyzed using colorimetric assays. Ammonium concentrations are determined using a fluorometric assay.
ISUS Nitrate history.
(California Cooperative Oceanic Fisheries Investigation, La Jolla, CA, 2017)
The original methods description was written Feb 2010 by J. Wilkinson. Changes to the method or instrument are listed below.