<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Y. Cheng</style></author><author><style face="normal" font="default" size="100%">Li, S. M.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Analytical method development of long-chain ketones in PM2.5 aerosols using accelerated solvent extraction and GC/FID/MSD</style></title><secondary-title><style face="normal" font="default" size="100%">INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2004</style></year><pub-dates><date><style  face="normal" font="default" size="100%">APR 15</style></date></pub-dates></dates><number><style face="normal" font="default" size="100%">5</style></number><volume><style face="normal" font="default" size="100%">84</style></volume><pages><style face="normal" font="default" size="100%">367-378</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">An analytical method has been developed to determine long-chain n -alkan-2-ones (C-10-C-33 ) in atmospheric particulate matter. This involves (1) solvent extraction with a Dionex Accelerated Solvent Extractor (ASE 200), followed by nitrogen blowdown; (2) a clean-up procedure using silica-gel chromatography to separate fractions of different polarities; and (3) gas chromatography with mass-selective detector (GC/MSD) identification and gas chromatography with flame ionization detector (GC/FID) quantitation. The recovery rates in the extraction/blowdown steps were quantified at different extraction and blowdown temperatures. The maximum recoveries for the selected ketones, obtained at 40degreesC for both extraction and blowdown, are 70-100% for the extraction step and 92-101% for the combined steps of blowdown and silica gel separation depending on the chain length of the ketones. The overall analytical instrumental detection limits for the ketones are &amp;lt;0.24 ng/muL in the GC/FID.</style></abstract></record></records></xml>