Laboratory measurements of oil mist concentrations using filters and an electrostatic precipitator
Laboratory measurements of oil mist concentrations using filters and an electrostatic precipitator
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DOI：
10.1080/15428119691014242
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发表时间：
1996-12-01
期刊：
影响因子：
--
通讯作者：
Boundy, MG
中科院分区：
文献类型：
--
作者：
Leith, D;Leith, FA;Boundy, MG
本研究调查了在采样过程中，矿物油雾从用于评估个人暴露的过滤器和静电除尘器基材上蒸发的可能性。如果样品蒸发，报告的雾浓度将低估真实暴露。用作加工液的矿物油通常不被认为是挥发性的，然而，当分散成雾时，其聚集表面面积很高，以至于可能发生显著的蒸发，国家职业安全与健康研究所方法5026规定，油雾浓度应通过在混合纤维素酯（MCE）或聚氯乙烯（PVC）的过滤器上收集雾来确定。收集的雾滴仍然分散在过滤器表面上，并在采样继续时与通过的空气接触，这种情况可能导致样品蒸发。对于用静电除尘器采集的样品，蒸发应该较少，在静电除尘器中，雾滴通过静电力与气流分离，并在除尘器壁上聚结，形成具有相对低表面积的膜。矿物油雾的收集进行了研究，使用专为个人采样和使用MCE或PVC过滤器的沉淀器。使用沉淀器收集的油雾的量显著高于使用过滤器收集的量，p < 0.001。清洁空气通过装有薄雾的除尘器和过滤器的进一步测试表明，除尘器比两种过滤器保留了更多的收集薄雾，p < 0.001，并进一步表明MCE过滤器比PVC过滤器保留了更多的薄雾，p=0.059。沉淀器和过滤器之间的样品收集和保留的差异在低于1 mg的雾负载下特别明显。
This study investigated the potential for mineral oil mist to evaporate, during sampling, from filters and electrostatic precipitator substrates used to assess personal exposure. If sample evaporation occurs, reported mist concentrations will underestimate true exposure. Mineral oil used as a machining fluid is not normally considered volatile, however, when dispersed as mist its aggregate surface a rea is so high that significant evaporation can occur, National Institute for Occupational Safety and Health Method 5026 specifies that oil mist concentrations should be determined by collecting mist on filters of mixed cellulose esters (MCE) or polyvinyl chloride (PVC). Collected mist droplets remain dispersed on the filter surface and in contact with passing air while sampling continues, conditions that can lead to sample evaporation. less evaporation should occur for samples taken with an electrostatic precipitator, where mist droplets are separated from the airflow by electrostatic force and coalesce on the precipitator wall to form a film with relatively low surface area. Collection of mineral oil mist was investigated using a precipitator designed for personal sampling and using either an MCE or a PVC filter. The amounts of oil mist collected using the precipitator were significantly higher than the amounts collected using the filters, p < 0.001. Further tests in which clean air passed through mist-loaded precipitators and filters showed that the precipitator retained substantially more collected mist than both fitters, p < 0.001, and further suggested that the MCE filter retained more mist than the PVC filter, p=0.059. Differences in sample collection and retention between the precipitator and the filters were particularly pronounced at mist loadings below 1 mg.