Polychlorinated biphenyls, PCBs, were a popular industrial additive between the 1920’s and 1970’s due to their many chemical properties. PCBs were later found to be toxic and were banned for use in the 1970s. Due to their chemical stability they can still be found in the environment. The aim of this project is to use a simplified method to determine the efficiency of a combined particulate and molecular gas mask filter, to filtrate the air from PCBs. The experiment is conducted using a metallic container with a PCB source placed inside on a heater. The PCB source is heated to a temperature of 60 oC. The container is connected to an air pump with a flow of 10 L/min ensuring a stable flow of air, and a smaller pump with a flow of 850 mL/min over a XAD-2 filter. The XAD-2 filter is used to absorb the PCBs that penetrates the filter and afterwards is extracted with n-hexane and analyzed with Gas Chromatography-Mass Spectrometry. The computer program, Gauss Peak Area calculator, is used to determine the PCB concentrations in the samples. The result shows that the filter is able to absorb all PCBs from the air for 106 hours exceeding the specified usage time of 50 hours. A filter penetration of 0,06 % occurred between a runtime of 106-178 hours, hence exceeding the specified penetration value of 0,05 % of the A2B2E2K2HgP3 R D filter.
|Uddannelser||Kemi, (Bachelor/kandidatuddannelse) Bachelor|
|Udgivelsesdato||20 dec. 2016|
- Gas mask