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Feasibility test of cellulose filter for collection of sulfuric acid mists
Separation and Purification Technology ( IF 8.6 ) Pub Date : 2017-12-15 , DOI: 10.1016/j.seppur.2017.12.028
Chih-Hsiang Chien , Chufan Zhou , Hsin-Chieh Wei , Simon Yang Sing , Alexandros Theodore , Chang-Yu Wu , Yu-Mei Hsu , Brian Birky

Exploring affordable and reliable filters to sample sulfuric acid mists is of interest because the polytetrafluoroethylene filters recommended by NIOSH Method 7908 are relatively costly. In this study, the feasibility of hardened cellulose filters such as Whatman grade 540, 541, and 542 filters were investigated for sampling sulfuric acid mists. Thirty-minute collection efficiency tests showed low collection efficiency for Whatman grade 540 and 541 filters while Whatman grade 542 filters exhibited high collection efficiency because of its smaller pore size. Eight-hour collection efficiency tests for the concentration of ca. 5000 µg/m3 showed Whatman grade 542 filters retained 95% collection efficiency. The collection efficiency over eight hours neither increased nor decreased because the mists might have been absorbed or have formed a thin layer on the fiber and the filter structural integrity did not change. The higher collection efficiency was at the expense of a higher pressure drop; however, the pressure drop was still under the back pressure limit for most personal pumps. The integrity test showed that under the typical concentration in the occupational environment the hardened cellulose filters can maintain integrity for more than seven days. In summary, Whatman grade 542 filter is a suitable alternative for measuring sulfuric acid mists.



中文翻译:

纤维素滤池收集硫酸雾的可行性试验

探索可负担得起的,可靠的过滤器以采样硫酸雾是很重要的,因为NIOSH方法7908推荐的聚四氟乙烯过滤器相对昂贵。在这项研究中,研究了硬化纤维素过滤器(如Whatman 540、541和542级过滤器)用于采样硫酸雾的可行性。三十分钟的收集效率测试显示,Whatman 540和541级过滤器的收集效率较低,而Whatman 542级过滤器的孔径较小,因此具有较高的收集效率。约八小时的收集效率测试,计算出的浓度约为 5000 µg / m 3显示Whatman 542级过滤器保留了95%的收集效率。八小时以上的收集效率既没有增加也没有减少,因为雾可能已被吸收或在纤维上形成了一层薄层,并且过滤器的结构完整性没有改变。较高的收集效率是以较高的压降为代价的。但是,大多数个人泵的压降仍低于背压极限。完整性测试表明,在职业环境中的典型浓度下,硬化的纤维素过滤器可以保持完整性超过7天。总之,Whatman 542级过滤器是测量硫酸雾的合适替代品。

更新日期:2017-12-15
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