[The quantitative measurement of several main contaminants in sealed cabin]

To establish a standardized analytical method of chromatography used for separating and determining six target contaminants including methyl alcohol, ethanol, glycol, acetic acid, acetone and benzene in space cabin simultaneously.

Optimal separating and examining conditions were determined through experiments by gas chromatography. Retention time was used to determine the nature of contamination and the method of extended standard to quantify accurately the six mixed contaminants. The method of five-point calibration was used.

Non-polar capillary GC column (30.00 m x 0.25 micrometers x 250 micrometers) was selected. Oven temperature was -30 degrees C initially and then hoisted to 80 degrees C at a rate of 4 degrees C/min, to 150 degrees C at 6 degrees C/min, to 250 degrees C at 10 degrees C/min and kept for 5 min. The temperature of flame ionization detector was 200 degrees C and that of back inlet adopting split mode was 150 degrees C. The linear correlation of calibration curve was satisfied and the precision of this method was high.

Under optimal experimental conditions the chromatographic peaks of six contaminants were separated so completely that they were quantified accurately simultaneously. The results showed this method was simple, quick and accurate.