ODF chemistry laboratory offers colorimetric determination of the following dissolved inorganic nutrients: NO3 + NO2, PO4, SiO4, NO2 and NH4. ~25 mL are necessary for shore based analysis. Preservation should be by freezing samples in 30 mL centrifuge tubes upright at < 0°C.
Nutrient analyses are performed on a SEAL Analytical segmented continuous-flow AutoAnalyzer 3 (AA3). After each run strip charts are reviewed for any problems and final concentrations (micromoles per liter) are calculated using SEAL Analytical AACE software. The analytical methods used are described here.