Polycyclic Aromatic Hydrocarbons (PAHs) with molecular weights > 252 u in particulate matter originating from a domestic heating system fuelled with wheat
2009 (English)Conference paper (Other academic)
Polycyclic Aromatic Hydrocarbons (PAHs) are ubiquitous environmental pollutants formed during the incomplete combustion of organic matter in air. PAHs with molecular weights (Mw) < 302 u have previously been determined in particulate matter originating from combustion of wheat. However, no studies exist in the literature on determination of high molecular weight (HMW) PAHs i.e. with Mw ≥ 302 u in particulate matter from wheat combustion. The particulate matter used in the present study was sampled from the exhausts generated from a 20 kW multi fuel boiler designed for the use of various bio-fuels such as cereals, wood pellets and wood chips (Baxi combi heath 2.5, Baxi, Sweden). The particulate matter was analyzed using the same method that previously has been used by our group to detect HMW PAHs in urban air particulate matter and diesel particulates. The particulate matter was extracted with toluene using Accelerated Solvent Extraction (ASE), cleaned up using silica solid phase extraction (SPE) cartridges and analyzed using on-line hyphenated High Performance Liquid Chromatography (HPLC)-Gas Chromatography (GC)-Mass Spectrometry (MS).This study presents for the first time quantitative data of the dibenzopyrene isomers (Mw 302 u) dibenzo(a,l)pyrene, dibenzo(a,e)pyrene, dibenzo(a,i)pyrene and dibenzo(a,h)pyrene as well as full scan mass spectra of tentatively identified HMW PAHs with Mw of 314 u, 316 u, 324 u, 326 u, 328 u, 340 u, 350 u, 352 u and 374 u detected in particulate matter from domestic heating using wheat as fuel. Comparisons are made with a recent publication in which we presented full scan mass spectra of HMW PAHs detected in the Standard Reference Materials (SRMs) 1649a Urban Dust and 1650b and 2975 Diesel Particulate Matter obtained from the National Institute of Standards and Technology (NIST). The mean amount of PAHs (Mw 252 u-302 u) found in the wheat combustion generated particulate matter was approximately a factor 3 and 6 times higher than what we have previously found in particulate matter originating from modern and older diesel engines, respectively. Björn Holstensson is acknowledged for providing the multi fuel boiler. Stefan Gustavsson and Lena Elfver are acknowledged for skillful sampling and laboratory work. The research project is financed by Stockholm University and Härseby farm.
Place, publisher, year, edition, pages
Biofuels, Environmental/Air, Gas Chromatography/Mass Spectrometry, PAH
IdentifiersURN: urn:nbn:se:su:diva-35130OAI: oai:DiVA.org:su-35130DiVA: diva2:286469