A new gas sampling device for gas chromatography

• Published in: Journal of Chromatography A 1984-01, Vol.289, p.43-51
• Main Author: Deans, D.R.
• Format: Article
• Language: English
• Subjects: Analytical chemistry; Chemistry; Exact sciences and technology; General, instrumentation
• ISSN: 0021-9673
• DOI: 10.1016/S0021-9673(00)95075-1

This paper describes a new sampler for taking gaseous samples for gas chromatographic analysis. The device provides samples of precise and selectable volume and can be used in place of conventional sampling valves. It has an advantage over conventional samplers in that it has no moving parts in the sample path. It can be constructed in any material that can be made in the form of pipes, this includes silica, glass, gold etc., so that it is suitable for labile compounds. The only moving part in the system is a two-way valve remote from the sampler and in the carrier gas supply. The design is such that the sample size is not sensitive to the temperature of the sampler, consequently the sampler can be used in high and variable temperature situations such as inside furnaces and reaction vessels. The sample size is selected remotely through a timer. This permits easy change of sample size and calibration of the gas chromatograph. The principles of operation and the mathematical theory are developed to show the theoretical limits within which precise repeatable samples can be taken. Experimental results are presented to show good agreement with the theory and to illustrate that the precision of sampling under a variety of conditions is as good or better than modern gas sample valves.