标准摘要
[中文适用范围]: 本国际标准为工作场所大气中空气中甲苯二异氰酸酯(TDI)的采样和分析提供了一般指导。 本国际标准规定的程序特别适用于 2,4- 和 2,6-TDI 蒸气的短期(15 分钟)和长期(4 小时)采样和分析。 该方法的上限约为每个样品 85 µg TDI。 这是一个保守的上限,基于以下要求:在涂覆的玻璃纤维过滤器上保持足够量的试剂,同时允许从含有 50 nl/l TDI 的气氛中以 1 l/min 的速度收集 4 小时的样品。 使用荧光检测器时,该方法的 2,4-TDI 定量限为 0.039 µg,2,6-TDI 定量限为 0.034 µg。 对于以 1 l/min 采集的 15 分钟样品,这些限值相当于 2,4-TDI 的 0.36 nl/l 和 2,6-TDI 的 0.32 nl/l。 对于以 1 l/min 收集的 4 小时样品,限值相当于 2,4-TDI 的 0,022 nl/l 和 2,6-TDI 的 0,020 nl/l。 指定试剂的商业可用性、通用分析仪器的使用以及该方法当前的广泛使用使得该标准方法非常适合工作环境中 TDI 的测定。 [外文原描述]: This International Standard gives general guidance for the sampling and analysis of airborne toluene diisocyanate (TDI) in workplace atmospheres. The procedure specified in this International Standard is especially suitable for short (15 min) and long-term (4 h) sampling and analysis of 2,4- and 2,6-TDI vapours. The upper limit for this method is approximately 85 µg of TDI per sample. This is a conservative upper limit based on the requirement of maintaining a sufficient amount of reagent on the coated glass fibre filter while permitting a 4 h sample to be collected at 1 l/min from an atmosphere containing 50 nl/l of TDI. The quantitation limits for this method are 0,039 µg for 2,4-TDI and 0,034 μg for 2,6-TDI using a fluorescence detector. These limits, for a 15-min sample collected at 1 l/min, are equivalent to 0,36 nl/l for 2,4-TDI, and 0,32 nl/l for 2,6-TDI. For a 4 h sample collected at 1 l/min, the limits are equivalent to 0,022 nl/l for 2,4-TDI and 0,020 nl/l for 2,6-TDI. The commercial availability of the specified reagents, the use of common analytical instrumentation, and the current widespread use of the method make this standard method ideally suited for the determination of TDI in workplace environments.
英文名称Workplace atmospheres — Determination of toluene diisocyanate vapours using 1-(2-pyridyl)piperazine-coated glass fibre filters and analysis by high performance liquid chromatography with ultraviolet and fluorescence detectors