Comparison Of Fabricated Carbon Nanotube Sorbent Felts And 3M? Charcoal Sorbent Wafers To Assess Passive Sampling Capabilities For VOCs | 17603
Occupational Medicine & Health Affairs
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The objectives of this research were to fabricate a CNT sorbent that allows safe use of this highly versatile material and
to assess the performance and sampling capabilities of CNT felts and compare them to an industry standard (3M OVM
3500). An average concentration of 9.3 ppm toluene was maintained in a stainless steel chamber. Toluene was chosen based
on its vast presence in the workplace and is a suitable surrogate for more toxic substances. Felts were fabricated using a fluid
filtration technique and sized to fit the 3M diffusive bodies. Felts were exposed in the chamber for 30 minutes, one, two,
and four hours along side standard 3M OVMs. These time trials were chosen based on CNT felt adsorption capacity. All
experiments were conducted in triplicate and desorbed following NIOSH Method 4000.Using a t-test, there was no statistical
difference in adsorbed mass between materials at 30 minute, one hour, and four hour trials (p-values: 0.058, 0.222, 0.066,
respectively). However, the two hour trial was statistically different with felts collecting a larger mass (p=0.020). Differences
between groups were not detectable at one hour and four hour trials due to high standard deviations in CNT felts.In all cases,
mass adsorbed by CNT felts was greater than or equal to 3M. Adsorption rate of both materials is similar. By fabricating CNT
felts of higher mass we can obtain similar sampling capacity to conventional diffusive samplers. CNT felts have great potential
for use in conjunction with photothermal desorption, an emerging desorption technique.
Samantha Connell completed her Master of Science in Public Health in Industrial Hygiene at the University of Alabama at Birmingham in the United States. She is
currently working on Project BONAS, completing research at the University of Lausanne and the Institute for Work and Health in Lausanne, Switzerland. She also
has industrial hygiene experience in the fields of research and development, oil and gas, and entertainment.
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