Concentrations of biomass burning tracers and carbonaceous components-Fairbanks-Alaska_2008-2009
Description
Concentrations of biomass burning organic tracers and carbonaceous components in Fairbanks aerosols, Alaska during June 2008 to June 2009.
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Total suspended particle samples (n = 32) were collected on the rooftop of the International Arctic Research Center (IARC) building at the University of Alaska Fairbanks (64.51°N; 147.51°W), Alaska, USA, from June 2008 to June 2009. Sampling was conducted on pre-combusted (450°C for 6 h) quartz fiber filters (47 mm, Pall Corporation, USA) using a low volume air sampler at a flow rate of 16.7 L min-1. After sampling, each sample filter was placed in a pre-combusted (450°C for 6 h) glass vial with a Teflon-lined screw cap. The sample filters were extracted with 7 mL of dichloromethane/methanol (2:1; v/v) under ultrasonication for 10 min. The solvent extracts were concentrated using a rotary evaporator under vacuum and then blown dry with nitrogen. The total extracts were then reacted with 50 µL of N,O-bis(trimethylsilyl)trifluoroacetamide (BSTFA) with 1% trimethylsilyl chloride and 10 µL of pyridine in a glass vial (1.5 mL) with a Teflon-lined screw cap at 70°C for 3 h to derive trimethylsilyl derivatives. The derivatized total extracts were analyzed using a Hewlett-Packard model 6890 GC coupled to Hewlett-Packard model 5973 Mass-Selective Detector (MSD) on an electron impact (EI) mode at 70 eV and scanned from 50 to 650 Daltons. Mass spectral data were acquired and processed using the Hewlett-Packard Chemstation software.