车间空气质量 采用溶剂解析/气相色谱法对挥发性有机物进行采样和分析 第2部分:扩散采样法

[中文适用范围]： ISO 16200 的这一部分为空气中挥发性有机化合物 (VOC) 的采样和分析提供了一般指导。 ISO 16200的这一部分适用于多种VOC，包括烃类、卤代烃、酯类、乙二醇醚类、酮类和醇类。 建议使用多种设备和吸附剂对这些 VOC 进行采样，每种吸附剂都有不同的适用范围。 注：经常使用活性椰壳炭。 极性很强的化合物可能需要衍生化；极低沸点化合物只能被吸附剂部分保留，并且只能定性估计。 半挥发性化合物将被吸附剂完全保留，但可能仅被部分回收。 ISO 16200 的这一部分适用于在暴露时间为 8 小时的情况下测量浓度范围约为 1 mg/m 至 1000 mg/m 的单独有机物的 VOC 空气蒸气。 有用范围的上限由所用吸附剂的吸附能力决定，并且根据分析溶液的稀释情况，由气相色谱柱和检测器的线性动态范围或所用分析仪器的样品分离能力决定。 有用范围的下限取决于检测器的噪声水平以及采样装置上或解吸溶剂中的分析物和/或干扰伪影的空白水平。 活性炭的人工制品通常为亚纳克级，但在某些批次中发现了更高含量的芳香烃。 [外文原描述]： This part of ISO 16200 gives general guidance for the sampling and analysis of volatile organic compounds (VOCs) in air. This part of ISO 16200 is applicable to a wide range of VOCs, including hydrocarbons, halogenated hydrocarbons, esters, glycol ethers, ketones and alcohols. A number of devices and sorbents are recommended for the sampling of these VOCs, each sorbent having a different range of applicability. NOTE Activated coconut shell charcoal is frequently used. Very polar compounds may require derivatization; very low boiling compounds will only be partially retained by the sorbents and can only be estimated qualitatively. Semi-volatile compounds will be fully retained by the sorbents, but may only be partially recovered. This part of ISO 16200 is valid for the measurement of airborne vapours of VOCs in a concentration range of approximately 1 mg/m3 to 1000 mg/m3 individual organic for an exposure time of 8 h. The upper limit of the useful range is set by the sorptive capacity of the sorbent used and, subject to dilution of the analysed solution, by the linear dynamic range of the gas chromatograph column and detector or by the sample splitting capability of the analytical instrumentation used. The lower limit of the useful range depends on the noise level of the detector and on blank levels of analyte and/or interfering artefacts on the sampling devices or in the desorption solvent. Artefacts are typically sub-nanogram for activated charcoal, but higher levels of aromatic hydrocarbons have been noted in some batches.