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Lowering of seawater pH due to increased anthropogenic carbon dioxide, known as ocean acidification (OA), has garnered attention from scientists and lawmakers around the globe. A great deal of research involves projecting how OA will affect aquatic organisms and systems in the future. It is generally recognized that many of the laboratories engaged in OA research do not possess the facilities or expertise...
An autonomous multi-parameter flow-through CO 2 system has been developed to simultaneously measure surface seawater pH, carbon dioxide fugacity (fCO 2 ), and total dissolved inorganic carbon (DIC). All three measurements are based on spectrophotometric determinations of solution pH at multiple wavelengths using sulfonephthalein indicators. The pH optical cell is machined from a PEEK...
This work describes spectrophotometric procedures for direct measurements of total inorganic carbon in aqueous solutions. The procedures used for these measurements involve CO 2 equilibration across the permeable wall of a Teflon AF-2400 liquid core waveguide. The waveguide acts as both an equilibration membrane and an optical cell in which spectrophotometric pH measurements, obtained via...
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