Determination of volatile organic compounds in water by purge and trap capillary GC/MS without using cryofocus; Utilizing advantage of characteristics of absorption and desorption on Tenax GC adsorbent.

HINO Takanobu, NAKANISHI Shigeko, HOBO Toshiyuki

doi:10.2116/bunsekikagaku.44.55

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Other Title

クライオフォーカスを使用しないパージ　＆　トラップ／キャピラリーガスクロマトグラフ／質量分析法による揮発性有機化合物の定量　Ｔｅｎａｘ　ＧＣ吸着剤の吸脱着特性とその利用
クライオフォーカスオシヨウシナイパージトラップキャピラリーガスク
Utilizing advantage of characteristics of absorption and desorption on Tenax GC adsorbent
Tenax GC吸着剤の吸脱着特性とその利用

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Description

A purge and trap method in which omitted cryofocus, was consequently designed in the study of theoretical recovery rates of volatile compounds in water by stripping. The trap tube was a small column made of stainless steel (length 11cm and 1/8-inch o.d.), packed with 0.07g of Tenax GC which adsorbs little moisture. Desorbing profiles of the compounds adsorbed on Tenax GC by heating were studied. Desorption of the compounds started rapidly at 200°C and above, the profiles of the desorbed compounds forming Gaussian peak shape against heating time. Moreover, the time required to desorb 23 compounds by rapid heating at 260°C ranged from 0.60 minute for 1, 1-dichloroethylene to 0.72 minute for bromoform, so that chromatogram peak shapes became sharp. Tenax GC does not take long to purge, because of the small breakthrough capacity of 1, 1-dichloroethylene. Excellent reproducibility of all compounds was obtained by keeping the temperature of the trap tube at about 20°C for a purging time of 10 min. Reproducibility of SIM chromatographic peak areas were within 10%(n=7) at the 10μg/l level. The cross-check to various environmental samples gave excellent results, corresponding to those of other laboratories using cryofocus. This technical procedure was simple and satisfactorily accurate.

Journal

BUNSEKI KAGAKU

BUNSEKI KAGAKU 44 (1), 55-62, 1995

The Japan Society for Analytical Chemistry

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