Department of Chemistry, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada.
Talanta. 1999 Aug 23;50(1):193-205. doi: 10.1016/s0039-9140(99)00120-4.
A new and simple method of solventless extraction of volatile organic compounds (VOCs) from air is presented. The sampling device has an adsorbing carbon coating on the interior surface of a hollow needle, and is called the inside needle capillary adsorption trap (INCAT). This paper describes a study of the reproducibility in the preparation and sampling of the INCAT device. In addition, this paper examines the effects of sample volume in active sampling and exposure time in passive sampling on the analyte adsorption. Analysis was achieved by sampling the air from an environmental chamber doped with benzene, toluene, ethyl benzene and xylenes (BTEX) compounds. Initial rates of adsorption were found to vary among the different compounds, but ranged from 0.0099 to 0.016 nmol h(-1) for passive sampling and from 2.2 to 10 nmol h(-1) for active sampling. Analysis was done by thermal desorption of the adsorbed compounds directly into a gas chromatograph injection port. Quantification of the analysis was done by comparison to actively sampled activated carbon solid phase extraction (SPE) measurements.
一种新的、简单的从空气中无溶剂提取挥发性有机化合物（VOCs）的方法被提出。采样装置在空心针的内表面具有吸附碳涂层，被称为内针毛细管吸附阱（INCAT）。本文描述了对 INCAT 装置的制备和采样的重现性的研究。此外，本文还考察了在活性采样中样品体积和在被动采样中暴露时间对分析物吸附的影响。分析是通过从环境室中采集掺杂有苯、甲苯、乙苯和二甲苯（BTEX）化合物的空气来实现的。发现不同化合物的初始吸附速率不同，但在被动采样中为 0.0099 到 0.016 nmol h(-1)，在主动采样中为 2.2 到 10 nmol h(-1)。通过直接将吸附的化合物热解吸到气相色谱进样口进行分析。通过与主动采样的活性炭固相萃取（SPE）测量进行比较来定量分析。
