Author ORCID Identifier
Date of Graduation
Statler College of Engineering and Mineral Resources
Industrial and Managements Systems Engineering
Gary L. Winn
Gary L. Winn
Using evacuated canisters for whole-air sampling allows for sampling without specific knowledge of the environment and potential analytes. Evacuated canisters are able to tolerate concentrations ranging from parts per trillion (PPT) to parts per million (PPM). The U.S. Environmental Protection Agency (EPA) has used evacuated canisters for years to sample volatile organic compounds (VOCs) from ambient air using their method TO-15 (LeBouf, et al., 2019). The GC-MS system used for the development of NMAM 3900 used liquid nitrogen to cool sorbent traps in the preconcentrator. Liquid nitrogen allows for cooling of specified points below ambient temperature. An alternative to liquid nitrogen for cooling is Peltier cooled technology. Advantages of using Peltier cooled technology include cost saving as well as extended run times with continuous operation because it does not need to have a continuous supply of liquid nitrogen to cool the system. This research assessed the use of systems equipped with Peltier cooled technology for NMAM 3900. Parts per billion and parts per million levels were evaluated on the Peltier system for 20 volatile organic compounds. To determine the performance of the system for the compounds, bias, precision, and accuracy were calculated for each targeted analyte. At the PPB concentration level, a total of 15 compounds (2,3-butanedione, 2,3-hexandione, 2,3-pentanedione, α-pinene, benzene, chloroform, d-limonene, ethylbenzene, m,p-xylene, methyl methacrylate, methylene chloride, n-hexane, o-xylene, styrene, toluene) passed the NIOSH accuracy criterion (± 25% error). At the PPM concentration level, a total of 16 compounds (2,3-butanedione, 2,3-hexandione, 2,3-pentanedione, acetonitrile, α-pinene, benzene, chloroform, d-limonene, ethylbenzene, m,p-xylene, methyl methacrylate, methylene chloride, n-hexane, o-xylene, styrene, toluene) passed for this criterion. At both PPB and PPM levels, acetaldehyde, acetone, ethanol, and isopropyl alcohol failed to pass the NIOSH accuracy criterion. Polar compounds did not perform well on this system due to the water management system. Overall, this method performs well for the compounds which passed and is beneficial to individuals looking to sample for these compounds and avoid the additional cost of using liquid nitrogen preconcentration.
Fernandez, Elizabeth Ann, "Performance of Peltier Cooled Technology During Preconcentration of Volatile Organic Compounds Analyzed by Gas Chromatography-Mass Spectrometry (GC-MS) using NIOSH Manual of Analytical Methods (NMAM) 3900" (2022). Graduate Theses, Dissertations, and Problem Reports. 11454.
Available for download on Monday, December 09, 2024