| 摘要 |
<p>A method and means for producing repeatable samples of liquids of a predetermined, precise volume, preferably for chemical analysis in such fields as atomic absorption spectroscopy and liquid chromatography comprising a capillary tube, or sample tip (10), with a cylindrical or conical inner wall (20) of a predetermined length, terminating in an annular step (16) formed by a radially outwardly extending wall which acts as a liquid stop by terminating the capillary action of liquid into the tip (10). The radially outer edge of the step (16) connects the tip (10) to a larger tube (12) not affected by capillary action which serves as a support for the sample tip (10). The liquid sample is formed by inserting the tip (10) in the liquid to be tested allowing the tip (10) to fill by capillary action to the step (16) where the capillary action terminates. The sample is then inserted into a liquid repository, such as a furnace in an atomic spectrometer, and emptied into the repository by the introduction of compressed gas connected to the tip. The volumetric size of the sample does not depend on a source of gas or vacuum and the amount of pressurized gas used to expel the sample is not critical.</p> |
