Creation of an Express Water-Toxicity Monitoring System for Spaceflight Conditions (Toxichnost (Toxicity)) - 06.06.18

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ISS Science for Everyone

Science Objectives for Everyone
Creation of an Express Water-Toxicity Monitoring System for Spaceflight Conditions (Toksichnost’) evaluates water toxicity in spaceflight conditions. This investigation was performed on water samples obtained from the ISS condensate water processor (downstream from the purification units, before the addition of preservatives), as well as on water samples delivered from Earth, for comparative analysis.
Science Results for Everyone
Drink this, not that. This experiment tested performance of an environmental water monitoring instrument that does not use preservatives in microgravity. The instrument measures changes in luminescence intensity of a microbe as it interacts with substances in a sample and compares that against a standard. Results of the first round of the experiment were used to improve water sampling techniques, and researchers developed recommendations for using the device to monitor water toxicity aboard the station. Analysis of samples from the station and control samples on the ground produced largely similar results.

The following content was provided by Tatiana Anatolievna Alyokhova, V. S. Danilov, Ph.D., and is maintained in a database by the ISS Program Science Office.
Experiment Details


Principal Investigator(s)
Tatiana Anatolievna Alyokhova, Biology Department of Moscow State University, Russia
V. S. Danilov, Ph.D., Russia

Information Pending

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Sponsoring Space Agency
Russian Federal Space Agency (Roscosmos)

Sponsoring Organization
Information Pending

Research Benefits
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ISS Expedition Duration
April 2003 - April 2005

Expeditions Assigned

Previous Missions
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Experiment Description

Research Overview
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Space Applications
The results of Toksichnost’ (the method for integral evaluation of the toxicity of water and water solutions) will have great practical significance for assuring safety and supporting the health of cosmonauts during long-term spaceflights.

Earth Applications
The Earth Application for this investigation has yet to be identified.

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Operational Requirements and Protocols
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Decadal Survey Recommendations

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Results/More Information

The experiment confirmed the viability of the method of express environmental monitoring designed for an integrated evaluation of the aqueous solutions and water without preservatives in microgravity through measuring the illumination intensity changes of the Ecolyum microbial biosensor as it interacts with substances in the sample test tube, as compared against a standard. The results of the first session of the experiment (ISS-Expedition 8) were used to improve experimental technique with regard to collecting water samples. It was found to be necessary to mechanically mix the solution being studied, which consisted of 2 liquids of nearly identical density, to provide the required homogeneity in microgravity. Analyses of water samples returned to Earth and control samples on the ground produced largely similar results.

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Results Publications

    Alekhova TA.  Microflora research on a surface of the International Space Station Russian Segment (ISS RS) constructional materials. 3rd Congress of Microbiologists of Uzbekistan, Tashkent, Uzbekistan; 2005

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Ground Based Results Publications

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ISS Patents

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Related Publications

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Related Websites
Energia - Science Research on the ISS Russian Segment

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image Biotoks instrument.
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