Particulate organic phosphorus is determined by the combustion method described by Karl et al. Fresh standards for each analysis are prepared for each analytical run from stock solutions prepared fresh at approximately 6 month intervals. Reagent grade salts are used for standard preparation. All samples are processed in duplicate. Reagent blank readings are taken at the beginning and end of each run to correct for instrument drift.
Standards are prepared to bracket the analytical values.
A file of standard slopes and intercepts is maintained. The samples are stored in a freezer until extraction. J.D. H. and T R. Parsons. A Practical Handbook of Seawater Analysis. Braman, R.S. and S.A. Hendrix.