| 摘要 |
A method is disclosed for detecting a volatile analyte in order to class and sort cork stoppers depending on the concentration of the analyte, detection being performed of concentrations in the order of ng/L (parts per trillion), in a concentrated gas applied to the cork stoppers in a closed containment system. According to said method, the cork stoppers are conveyed individually or in groups to an incubation chamber (1); air or nitrogen is injected into the incubation chamber (1), the gas enriched with cork volatile compounds is entrained and carried to the concentration system which contains a trap (4) heated by desorption of the volatile compounds; the volatile compounds are carried by the entraining gas to a detection system (6) which records a signal associated with the presence of the analyte, the signal being used for classing the stopper or groups of cork stoppers; finally, a software receives and compares the signal with a set minimum limit and takes the decision to approve or reject the stopper. Also described is a system for implementing this method. |
