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为研制与时间加权平均浓度（TWA）配套的检测方法，要求有适用于低浓度、长时间的采样器。无泵型采样器一般是利用扩散原理设计的[1]，适用于以蒸气态存在于空气中的物质的较长时间的采集。天津劳研所研制的GJ—1型无泵型采样器已用于对苯、甲苯等物质的采集监测[2，3]，效果很
In order to develop a test method compatible with time-weighted average concentration (TWA), a sampler suitable for low concentration and long time is required. Pumpless samplers are generally designed using the diffusion principle [1] and are suitable for longer time acquisition of substances in the vapor state in the air. The GJ-1 pumpless sampler developed by Tianjin Institute of Laboratories has been used for the monitoring of the collection of benzene, toluene and other substances [2,3].