Organic water pollutants -- Analysis, Water -- Carbon content -- Measurement, International Space Station -- Equipment and supplies -- Evaluation
The International Space Station (ISS) total organic carbon analyzer (TOCA) is designed to autonomously assess recovered water quality by providing an indication of total organic carbon (TOC). The current TOCA has been on the ISS since November 2008. Functional checkout and operations revealed complex operating considerations. Specifically, failure of the hydrogen (H2) catalyst resulted in development of an innovative oxidation analysis method. This method reduces activation time and limits the H2 produced during analysis, while retaining the ability to indicate TOC concentrations within 25% accuracy. Subsequent testing and comparison to archived samples returned from the station and tested on the ground yield high confidence in this method, and in the quality of the recovered water.
Bentley, N., Thomas, E., Van Wie, M., Morrison, C., Stinson, R., Second Generation International Space Station (ISS) Total Organic Carbon Analyzer (TOCA) Verification Testing and On-Orbit Performance Results, International Conference on Environmental Systems, Narcelona, 2010. DOI: 10.2514/6.2010-6043