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Missoula, MT, United States

Spaulding R.,Sunburst Sensors, LLC | DeGrandpre M.,University of Montana | Harris K.,University of Montana
Sea Technology | Year: 2011

The SAMI-C02 and SAMI-pH instruments demonstrate the power of using pH and Ar data to quantify the entire carbonate system. Shipboard systems are routinely used to measure pCO2, pH, DIC and AT. The SAMI-C0 2 and SAMI-pH are both colorimetric, reagent-based sensors and have very similar designs. Both use a solenoid pump and a solenoid valve for fluid control. The solutions are pumped to a fiber optic flow cell where absorbance measurements are made. While the original SAMIs have made significant progress in autonomous pH and CO2 sensing, five years of research and development has culminated in the SAMI2, which features the same data-collection capabilities in a smaller package that consumes less power and is easier to use. The ability of the SAMI instruments to operate autonomously for long time periods allows oceanographers and marine biologists to study the effects of increasing C02.

Agency: NSF | Branch: Standard Grant | Program: | Phase: | Award Amount: 140.70K | Year: 2011

The PI request funding to undertake design improvements and complete the evaluation of an autonomous sensor for measurement of seawater total alkalinity (SAMI-alk). Total alkalinity (AT) is one of the four measureable dissolved inorganic carbon parameters and is therefore of paramount importance in the study of carbon cycling in the oceans. AT is commonly measured as part of shipboard hydrographic surveys and ocean time-series and has more recently become a critical parameter for ocean acidification studies. An autonomous AT sensor can be used in combination with other CO2 parameter sensors that are commercially available, i.e. pH and pCO2, to remotely quantify the inorganic carbon system. For example, if pH and AT are accurately measured, total dissolved inorganic carbon (DIC), carbonate, and CaCO3 saturation state can be calculated. Long-term mooring based quantification of these parameters is not yet possible. Through a previous NSF grant, we demonstrated that a novel titration methodology named Tracer Monitored Titration (TMT) could simplify AT analysis by eliminating the need for volumetric or gravimetric measurements required for conventional AT titrations. The SAMI-alk was tested both in the lab and during a cruise. The performance on the cruise was not as good as the laboratory tests. This proposal requests funds to complete the SAMI-alk development and evaluation.

Broader Impacts:

The ability to measure alkalinity is a key need for acidification research. If successful, the instrumentation development proposed here will provide an important tool for understanding the vulnerability and response of marine ecosystems to acidification. The PI has actively pursued commercialization of the autonomous instruments that he has developed in the past. Commercialization of the proposed alkalinity sensor through will greatly broaden the impacts of the technology, making it broadly available to the ocean sciences community. The project includes funding for on undergraduate student.


Agency: Department of Commerce | Branch: | Program: SBIR | Phase: Phase I | Award Amount: 75.00K | Year: 2001


Agency: Department of Commerce | Branch: | Program: SBIR | Phase: Phase I | Award Amount: 95.00K | Year: 2006

NOAA requests proposals to develop a system for the measurement of pCO2, dissolved inorganic carbon (DIC) and total alkalinity (AT) for shipboard use. In response, Sunburst Sensors proposed integration of a novel approach for analysis of AT developed at the University of Montana (UM) with existing DIC and pCO2 analyzers developed by Burke Hales (OSU) and pH and pCO2 sensors developed at UM. In Phase I, Sunburst will demonstrate the feasibility of a commercial rapid response, low volume design for an AT analyzer based on UM¿s tracer monitored titration (TMT) methodology and reducing the sample size and response times for the pCO2 and pH systems. With these optimizations in place, Phase II will then focus on integrating them into a single system capable of sampling from either a ship seawater line or discrete samples. The end product will be a valuable tool that can be sold to oceanographers and limnologists.

Sunburst Sensors, LLC | Entity website

AFT Bag Replacement Instructions on how to replace reagent bags for the AFT-CO2 or AFT-pH VIDEO

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