Precolumn, Capillary Column, Electron Capture G-AS Chromatography For High Efficiency Trace Determination
作者:
W.J. Kirsten,
P.E. Mattsson,
期刊:
Analytical Letters
(Taylor Available online 1971)
卷期:
Volume 4,
issue 4
页码: 235-245
ISSN:0003-2719
年代: 1971
DOI:10.1080/00032717108058606
出版商: Taylor & Francis Group
关键词: Gas chromatography;trace determination;precolumn capillary column;electron capture detection
数据来源: Taylor
摘要:
A method for gas chromatographic trace determination is described in which the sample solution is injected into a packed precolumn which is connected to an EC-detector. When solvent and low boiling compounds have been eluted, the precolumn is connected to the cold entry of a capillary column with another EC-detector and the trace compound is collected as a narrow band at the entry of this column. The precolumn is then reconnected to its own detector, the capillary column is heated and the trace compound is eluted and measured. Meanwhile high boiling compounds are swept out of the precolumn. When the base line of the precolumn is stable the next sample is injected and the capillary column is cooled again, and so on. In order to avoid background plateaus and ghost peaks the carrier gas must be purified, which is easily achieved with cooling traps with dry-ice and acetone.
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