Soyuz 25 Return Samples: Assessment of Air Quality Aboard the International Space Station

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Soyuz 25 Return Samples: Assessment of Air Quality aboard the International Space Station Six mini-grab sample containers (m-GSCs) were returned aboard Soyuz 25. The toxicological assessment of 6 m-GSCs from the ISS is shown in Table I. The recoveries of the 3 internal standards, l3 C-acetone, fluorobenzene, and chlorobenzene, from the GSCs averaged 76, 108 and 88%, respectively. Formaldehyde badges were not returned aboard Soyuz 25. Table I Analytical Summary of ISS Results Module/ Sample Date of NMVOCsa Freon 218 T Value' Alcohols Sample (mg/m3) (mg/m' ) (units) (mg/m' ) Lab 4113111 8.2 32 0.26 7.4 JEM 4113111 8.9 17 0.30 7.9 SM 4113111 9.5 34 0.28 8.3 Columbus 5/4111 7.5 44 0.30 6.1 SM 5/4111 7.6 53 0.29 6.2 Lab 5/4111 8.4 28 0.35 6.7 Guideline 25 none 1.00 <5 • Non-methane volatile orgamc hydrocarbons, excluding Freon 218 b Based on 180-d SMACs and calculated excluding CO" formaldehyde, and siloxanes. Except for the relatively high alcohol values, the air quality parameters are well within bounds for acceptable air quality. Ethanol was the primary cause of the high alcohol levels; however, we are not aware ofa new source of this compound. These results validate the elevated ethanol measurements recorded by the Air Quality Monitor and noted in the April and May Environmental Bulletins. The alcohol guideline is intended to protect the water recovery system 3 from risk of overloading. In the 6 air samples, carbon monoxide averaged 1.6 mg/m , which is down slightly from previous data (enclosed tables). Overall the air quality was consistent between modules and the compound concentrations from this limited number of samples suggest that the air was acceptable for respiration. Enclosures Table I: Analytical concentrations of compounds found in the Soyuz 25 return m-GSCs Table 2: T-values orthe compounds in table I .

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