ISO 17736:2010 工作场所的空气质量 用双过滤取样器测定空气中的异氰酸酯以及用高压液相色谱进行分析
标准编号：ISO 17736:2010
中文名称：工作场所的空气质量 用双过滤取样器测定空气中的异氰酸酯以及用高压液相色谱进行分析
英文名称：Workplace air quality — Determination of isocyanate in air using a double-filter sampling device and analysis by high pressure liquid chromatography
发布日期：2010-12
标准范围
ISO 17736:2010给出了工作场所空气中异氰酸酯采样和分析的一般指南。ISO 17736:2010适用于含有游离异氰酸酯官能团的有机化合物，并专门用于单体、聚合物和预聚物、蒸汽和气溶胶的定量。使用分离装置进行差异空气取样，该分离装置可以显示现场发现的所分析的异氰酸酯的物理状态。然而，对于给定的情况，例如当在第一过滤器上收集的气溶胶含有迁移到第二过滤器并且然后被定量为气相异氰酸酯的游离单体时，该容量可能显示出限制。芳香族单体的测定包括甲苯二异氰酸酯(TDI)和4,4'-二异氰酸酯-二苯基甲烷(MDI)。脂肪族单体包括异佛尔酮二异氰酸酯(IPDI)、4,4'-亚甲基双-(环己基异氰酸酯)(HMDI)和1,6-六亚甲基二异氰酸酯(HDI)。异氰酸酯低聚物和预聚物也可以使用该方法测定。双过滤器法旨在通过个人监测或固定位置监测来确定工作场所环境中有机异氰酸酯的短期（15分钟）暴露浓度。然而，如果预计仅以蒸汽形式暴露，则采样时间可延长至8小时。由于过滤器在取样后立即在现场衍生，因此异氰酸酯气溶胶由于其与其他化学品的反应而损失可以忽略不计，除了非常快速反应的异氰酸酯系统，例如聚氨酯应用中的MDI泡沫喷涂。该方法适用于NCO当量浓度范围为0.01 μ g/样品至2.1 μ g/样品的空气中有机异氰酸酯的测量，对应于15 l样品体积约为0.67 μ g/m3至140 μ g/m3。该范围约为许多国家当局设定的单体当前既定阈值限值(TLV)5 ppb的八倍。
ISO 17736:2010 gives general guidelines for the sampling and analysis of airborne isocyanates in workplace air. ISO 17736:2010 is appropriate for organic compounds containing free isocyanate functional groups and is specific for the quantification of monomers, polymers and prepolymers, vapours and aerosols. Differential air sampling is performed with a segregating device which can show the physical state of the isocyanates analysed as found in the field. This capacity, however, may show limitations for given situations, e.g. when aerosols collected on the first filter contain free monomer that migrates to the second filter and is then quantified as vapour phase isocyanate. The determination of aromatic monomers includes toluene diisocyanate (TDI) and 4,4'-diisocyanato-diphenylmethane (MDI). Aliphatic monomers include isophorone diisocyanate (IPDI), 4,4'-methylene bis-(cyclohexyl isocyanate) (HMDI) and 1,6-hexamethylene diisocyanate (HDI). Isocyanate oligomers and prepolymers can also be determined using this method.The double-filter method is designed to determine short-term (15 min) exposure concentrations of organic isocyanates in a workplace environment by personal monitoring or by fixed location monitoring. However, if the exposure is expected to be in vapour form only, then sampling time can be extended to 8 h. Since the filter is derivatized in the field immediately after sampling, loss of isocyanate aerosol because of its reaction with other chemicals is negligible except for very fast-reacting isocyanate systems such as foam spraying of MDI in polyurethane applications. The method is suitable for the measurement of airborne organic isocyanates in the NCO equivalent concentration range of 0,01 μg/sample to 2,1 μg/sample, corresponding to approximately 0,67 μg/m3 to 140 μg/m3 for a 15 l sample volume. This range brackets about eight times the current established threshold limit value (TLV) of 5 ppb for monomers set by many national authorities.
标准预览图
