Laboratory of Applied Environmental Chemistry, Department of Environmental Science, University of Eastern Finland, Patteristonkatu 1, FI-50100 Mikkeli, Finland.
Talanta. 2011 May 15;84(3):738-44. doi: 10.1016/j.talanta.2011.01.067. Epub 2011 Feb 4.
Methyl tert-butyl ether (MTBE) is commonly used as chemical additive to increase oxygen content and octane rating of reformulated gasoline. Despite its impact on enhancing cleaner combustion of gasoline, MTBE poses a threat to surface and ground water when gasoline is released into the environment. Methods for onsite analysis of MTBE in water samples are also needed. A less common technique for MTBE detection from water is ion mobility spectrometry (IMS). We describe a method for fast sampling and screening of MTBE from water by solid phase microextraction (SPME) and IMS. MTBE is adsorbed from the head space of a sample to the coating of SPME fiber. The interface containing a heated sample chamber, which couples SPME and IMS, was constructed and the SPME fiber was introduced into the sample chamber for thermal desorption and IMS detection of MTBE vapors. The demonstrated SPME-IMS method proved to be a straightforward method for the detection of trace quantities of MTBE from waters including surface and ground water. We determined the relative standard deviation of 8.3% and detection limit of 5 mg L(-1) for MTBE. Because of short sampling, desorption, and detection times, the described configuration of combined SPME and IMS is a feasible method for the detection of hazardous substances from environmental matrices.
甲基叔丁基醚（MTBE）通常用作化学添加剂，以提高汽油的含氧量和辛烷值。尽管 MTBE 有助于提高汽油的清洁燃烧性能，但当汽油释放到环境中时，它会对地表水和地下水造成威胁。因此，需要开发用于现场分析水样中 MTBE 的方法。检测水中 MTBE 的一种不太常见的技术是离子迁移谱（IMS）。我们描述了一种通过固相微萃取（SPME）和 IMS 从水中快速采样和筛选 MTBE 的方法。MTBE 从样品的顶空被吸附到 SPME 纤维的涂层上。构建了包含加热样品腔的接口，该接口将 SPME 和 IMS 耦合，将 SPME 纤维引入样品腔中，以对 MTBE 蒸气进行热解吸和 IMS 检测。所证明的 SPME-IMS 方法被证明是一种从包括地表水和地下水在内的水样中检测痕量 MTBE 的直接方法。我们确定了 MTBE 的相对标准偏差为 8.3%，检测限为 5mg/L。由于采样、解吸和检测时间短，这种组合的 SPME 和 IMS 配置是一种从环境基质中检测有害物质的可行方法。
