Invitation to participate in an inter-laboratory comparison of carbon dioxide measurements

A second inter-laboratory comparison of seawater CO2 measurements is planned for the second quarter of 2017. The goal of this comparison is to assess the present quality of seawater CO2 measurements for total alkalinity, total dissolved inorganic carbon, and pH. We encourage all laboratories to participate, whether they participated in 2013 or not. Anonymity of laboratory results is assured. The costs for participation are expected to be about US $400. Please contact Dr Emily Bockmon at ebockmon(at)ucsd.edu to express interest so we can plan appropriately.

The test samples will be prepared in Andrew Dickson’s laboratory at the Scripps Institution of Oceanography and will comprise four 500 mL bottles of two different seawaters (each in duplicate). Alkalinity and total carbon of these seawaters will be modified from natural seawater so as to create suitable test samples. The samples will also be analyzed at Scripps to provide reference values for the comparison. Please see doi:10.1016/j.marchem.2015.02.002 for results from the 2013 inter-laboratory comparison.

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