Niri Vadoud H, Eom In-Yong, Kermani Farhad Riazi, Pawliszyn Janusz
Department of Chemistry, University of Waterloo, Waterloo, Ontario, Canada.
J Sep Sci. 2009 Apr;32(7):1075-80. doi: 10.1002/jssc.200800603.
The possibility of sampling the free and particle-bound concentrations of organic compounds was studied using two different sampling techniques at the same time: needle trap device (NTD) and solid-phase microextraction (SPME). In this study, a mosquito coil was used to produce gaseous (free) and particle-bound compounds. Allethrin, the active ingredient in mosquito coils, was chosen as the target analyte. Under the same sampling conditions, the amount of allethrin extracted from the mosquito-coil smoke was higher for the NTD compared to the SPME fiber, while the extracted amounts were almost the same for both devices when sampling gaseous samples of allethrin. These results can be explained by the fact that the SPME fiber can only extract free molecules (based on diffusion), whereas the NTD, an exhaustive sampling device, collects both free and particle-bound allethrin. Breakthrough for NTD and carryover for both NTD and SPME were negligible under the given sampling and desorption conditions.
针捕集装置（NTD）和固相微萃取（SPME）。在本研究中，使用蚊香产生气态（游离态）和颗粒结合态化合物。蚊香中的活性成分丙烯菊酯被选为目标分析物。在相同的采样条件下，与SPME纤维相比，NTD从蚊香烟雾中提取的丙烯菊酯量更高，而在对气态丙烯菊酯样品进行采样时，两种装置的提取量几乎相同。这些结果可以通过以下事实来解释：SPME纤维只能提取游离分子（基于扩散），而NTD作为一种全量采样装置，可收集游离态和颗粒结合态的丙烯菊酯。在给定的采样和解吸条件下，NTD的穿透率以及NTD和SPME的残留率均可忽略不计。
