| 摘要 |
A system and method for conducting fast and reliable determinations of the presence of specific compounds in a sample based on the gases that are evolved from it upon reaction with specific reagents. The system in one implementation includes a flexible pouch with pre-measured analysis-specific reagents in sealed ampoules placed in a flexible harness and a detection tab placed in slits on top of the pouch. Squeezing the pouch breaks the ampoules and releases the reagents into the sample. The reagents react and if the specific analyte is present in the sample, gas indicative of the analyte is released from the sample and reacts with material on the tab to produce a quantitative change in such material, e.g., a color change. The color change intensity is related to the quantity of the analyte in the sample and may be estimated by comparing it to a standard color chart. In a preferred arrangement, the reagents in the ampoule include, in addition to the reagents needed to react with the target species to form a gas reaction product, additional reagents that react and form a gas to sweep the gaseous product of the primary reaction, to bring it more quickly in contact with the analytical tab, thereby shortening the analysis time.
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