Wang D K W, Austin C C
Environmental Technology Centre, Environment Canada, 335 River Road, Ottawa, K1A 0H3, Canada.
Anal Bioanal Chem. 2006 Oct;386(4):1099-120. doi: 10.1007/s00216-006-0466-6. Epub 2006 May 31.
Canister methodology is applicable to 150 polar and nonpolar VOCs found in ambient air from parts-per-billion by volume (ppbv) to parts-per-million (ppmv) levels, and has been validated at parts-per-trillion (pptv) levels for a subset of these analytes. This article is a detailed review of techniques related to the collection of volatile organic compounds (VOCs) in evacuated Summa and fused-silica-lined canisters, and their analysis by gas chromatography/mass spectrometry (GC/MS). Emphasis is placed on canister cleaning, VOC stability in canisters, sample dilution, water management, and VOC cryogenic and sorbent preconcentration methods. A wide range of VOC preconcentration and water management methods are identified from the literature, and their relative merits and disadvantages are discussed. Examples of difficulties that commonly arise when processing canister samples are illustrated, and solutions to these problems are provided.
罐采样方法适用于环境空气中发现的150种极性和非极性挥发性有机化合物（VOCs），浓度范围从十亿分之一体积比（ppbv）到百万分之一（ppmv），并且对于其中一部分分析物已在万亿分之一（pptv）水平上得到验证。本文详细综述了与在抽空的苏玛罐和熔融石英衬里罐中收集挥发性有机化合物（VOCs）以及通过气相色谱/质谱（GC/MS）进行分析相关的技术。重点在于罐的清洗、VOCs在罐中的稳定性、样品稀释、水分管理以及VOCs的低温和吸附剂预浓缩方法。从文献中识别出了广泛的VOC预浓缩和水分管理方法，并讨论了它们的相对优缺点。阐述了处理罐样品时常见困难的示例，并提供了这些问题的解决方案。
