Abstract: Disclosed is a method and apparatus for injecting samples into the evaporator of a gas chromatograph effected by a sample carrier, whereafter the thus formed vapors are transferred into the flow of a carrier gas. According to one aspect of the invention, the evaporator of the gas chromatograph is sealed only for a period of the sample introduction subsequent to the physical communication of the evaporator with the sample carrier. Vapors of the substance under analysis are conveyed from the evaporator into the chromatographic column via a flow constrictor of constant cross-sectional diameter.According to another aspect of the invention the flow constrictor of constant cross-section is positioned essentially after the passageway communicating the sample carrier with the evaporator but prior to the passageway for evacuating the vapors from the evaporator to the chromatographic column.

Abstract: A device for taking and injecting microsamples of liquid comprises a casing having a hollow needle accommodating a plunger. The end of the plunger telescoping outside the needle has a plurality of through-passing transverse bores spaced lengthwise of the plunger and having skew axes, the bores serving as cavities for successively taking a plurality of samples. The plunger is connected to a slider having a handle. The device has means for preventing the slider and plunger from rotating about the longitudinal axis.