Levin J O, Lindahl R, Andersson K
JAPCA. 1989 Jan;39(1):44-7. doi: 10.1080/08940630.1989.10466506.
A diffusive sampler for formaldehyde originally designed for use in personal monitoring of worker exposure has been evaluated for static measurement of low formaldehyde levels in indoor air. The sampler consists of a 37-mm glass fiber filter impregnated with 2,4-dinitrophenylhydrazine and phosphoric acid and mounted in a polystyrene filter cassette. Formaldehyde is sampled by controlled diffusion and subsequent hydrazone formation on the filter. The hydrazone is eluted from the filter with acetonitrile and analyzed by liquid chromatography and a UV detector. The diffusive sampler was evaluated for static (area) sampling in several industries, offices, and homes with formaldehyde levels of 6-200 ppb. Results from diffusive samplers were compared with results from pumped samplers. Even at low wind velocities (less than 0.01 m.s-1) there was good agreement between pumped and diffusive samples. The sensitivity will be 1 ppb in a 24-h sample, making the sampler especially useful for indoor air monitoring of low formaldehyde levels.
一种最初设计用于个人监测工人接触甲醛情况的扩散式采样器，已针对室内空气中低甲醛水平的静态测量进行了评估。该采样器由一个浸渍有2,4 - 二硝基苯肼和磷酸的37毫米玻璃纤维过滤器组成，并安装在聚苯乙烯过滤盒中。通过控制扩散以及随后在过滤器上形成腙来采集甲醛。用乙腈从过滤器上洗脱腙，并通过液相色谱和紫外检测器进行分析。在甲醛水平为6 - 200 ppb的多个行业、办公室和家庭中，对该扩散式采样器进行了静态（区域）采样评估。将扩散式采样器的结果与泵吸式采样器的结果进行了比较。即使在低风速（小于0.01 m·s⁻¹）下，泵吸式样品和扩散式样品之间也有很好的一致性。在24小时的采样中，灵敏度将达到1 ppb，这使得该采样器对于室内低甲醛水平的空气监测特别有用。
