被動式採樣器採集空氣中甲苯的性能評估

Performance Evaluation of Passive Monitors for Sampling Toluene in Air

在認為被動式採樣器經過充分的性能評估之後，有可能與主動式採樣器同時成為勞委會建議之採樣分析方法，尤其是利用活性碳為吸附材質採集有機蒸氣的擴散式採樣器。因此繼我國被動式採樣器性能評估準則草案的提出之後，選擇甲苯為分析對象物質，利用我國評估準則的設計，在實驗室及現場充分評估二種市售的被動式採樣器的性能，包括脫附效率，風速的影響、採樣率及採樣容量、逆擴散、貯存安定性、溫度影響、環境因子的影響、準確度與精密度、空白值及採樣器的完整性，以及現場的表現。為我國準則提供完整的應用實例並檢驗其適用性。

Passive monitors, especially the coconut shell based charcoal, evaluated by the appropriate validation protocol, should be considered as effective as the active samplers. Thus, two commercially available passive monitors were validated for sampling toluene in the laboratory simulated environments and on field, by following the scheme in the proposed protocol for evaluation of passive monitors in Taiwan, the Republic of China. The performance characteristics being concerned include analytical recovery (or desorption efficiency), effect of face velocity and sampler orientation, sampling rate and capacity, reverse diffusion, storage stability, temperature effects, environmental factor effect, accuracy and precision, sampler blank and integrity, and behavior in the field, Data obtained were used to demonstrate and/or check feasibility of the protocol.