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Direct and indirect pCO2 measurements in a wide range of pCO2 and salinity values (the Scheldt Estuary)
Frankignoulle, M.; Borges, A.V. (2001). Direct and indirect pCO2 measurements in a wide range of pCO2 and salinity values (the Scheldt Estuary). Aquat. Geochem. 7(4): 267-273. dx.doi.org/10.1023/A:1015251010481
In: Aquatic Geochemistry. Springer/Springer Science+Business Media: London; Dordrecht; Boston. ISSN 1380-6165, more
Peer reviewed article  

Available in  Authors 
    VLIZ: Open Repository 228007 [ OMA ]

Keywords
    Carbon dioxide; Salinity; Marine; Brackish water
Author keywords
    pH; estuaries; NBS Scale; pCO2<; sub>; equilibrator; infra-red gas analyser

Authors  Top 
  • Frankignoulle, M., more
  • Borges, A.V., more

Abstract
    Recent improvements in both Infra-red spectroscopy and equilibrator techniques have allowed to determine, for the first time, pCO2 using simultaneously and continuously both the direct and indirect methods in an estuary where pCO2 values range from 500 to 8500 µatm and salinity from 0 to 30. Our results show that both methods are in excellent agreement in the whole estuary (r2 = 0.999, n = 1075, p < 0.0001). Thus, the NBS (US National Bureau of Standards) scale, although inadequate for seawater samples, is appropriate for estuarine waters and can be applied with confidence to calculate pCO2.

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