| Abstract | An intercomparison exercise was undertaken to assess the current capabilities of a group of laboratories to quantitate orthophosphate, silicate, nitrite and nitrite + nitrate in a seawater sample. This is the second such exercise sponsored by the NOAA Center for Coastal Monitoring and Assessment (CCMA) and coordinated by the Institute for National Measurement Standards of the National Research Council of Canada. Two seawater samples; one from Pensacola Sound FL, and a proposed seawater certified reference material ( MOOS-1), were distributed to thirty-one laboratories. Twenty-four laboratories submitted data. Methodologies were not prescribed to the participants, however, all reported results were obtained based on traditional colorimetric procedures. Generally, satisfactory agreement among participants was achieved with results within ten percent of the assigned mean values. |
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