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This article describes an accessory and method for storing a test sample and subsequently introducing it to a gas chromatograph without exposing the sample to contamination.
English (United States)
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Gas Chromatography Accessory for Handling Samples
This article describes an accessory and method for storing a test sample and
subsequently introducing it to a gas chromatograph without exposing the sample
In various manufacturing and developmental activities, it is necessary to
analyze samples of liquids, paste and solids to determine the presence or
absence of various known or expected solvents. A technique for analyzing
materials for vaporizable materials is gas chromatography. In this accessory the
sample 10 is placed in a glass vial 12 and capped with a resilient cap, for
example, rubber. The sample 10 is frequently gathered and stored for
indeterminate periods of time. The sealed vial is convenient and provides a good
enclosure for the sample. When the sample is to be tested, the vial 12 is placed
in a block 16 surrounded and heated by a suitable resistance heater 18. The
block is supported on a base 20 of thermal insulator material. An upright support
22 holds a vertically movable plunger carriage 24 on which is mounted two
spaced needles 26. In use' the sample is placed in block 16 which is heated to
the desired temperature, the plunger 24 moved downwardly so that the needles
26 Pierce the rubber stopper 14, and the solvent vapors removed through lines
28 adn 30 where they are introduced to the chromatograph. The vapors in the
vial are swept out conventionally with a stream of inert gas. Leads 32 and 34
supply current to heater 18.