|WATTEN, B - USGS
|SUMMERFELT, S - FRESHWATER INSTITUTE
Submitted to: International Conference on Recirculating Aquaculture
Publication Type: Proceedings
Publication Acceptance Date: 5/15/2005
Publication Date: 7/21/2006
Citation: Pfeiffer, T.J., Watten, B.J., Summerfelt, S.T. 2006. Comparative performance of co2 measuring methods: marine recirculating system applications. In: Proceedings of the 6th International Conference on Recirculating Aquaculture, July 21-23, 2006, Blacksburg, Virginia. p.421-426.
Technical Abstract: In recirculating aquaculture systems problems are encountered with dissolved carbon dioxide due to the higher supported fish loading rates and limited degassing abilities of the systems for the quantities of carbon dioxide produced. Determining dissolved carbon dioxide (DC) concentrations in recirculating systems by titration is a satisfactory indicator method for field testing or for routine control applications however, the titrimetric DC determination in marine recirculating aquaculture systems has its limitations. The titrimetric method for DC determination was originally developed for boiler feed and drinking water analysis as the carbon dioxide concentration of the water may significantly contribute to pipe and equipment corrosion. Typically, water from aquaculture systems contains compounds that can interfere with the CO2 determination, including phosphates, silicates, sulfide, ammonia, and nitrite. The titrimetric method is also inapplicable for samples that contain high dissolved solids, such as those encountered in seawater. Consequently, due to the USDA/ ARS research effort in Fort Pierce, FL directed towards inland aquaculture for low salinity species and the increased interest in marine recirculating aquaculture systems, alternative methods were determined for measuring DC in marine or low salinity recirculating aquaculture systems.