<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Merlin, Mireya</style></author><author><style face="normal" font="default" size="100%">Guigard, Selma E.</style></author><author><style face="normal" font="default" size="100%">Fedorak, Philip M.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Detecting naphthenic acids in water using gas chromatography-mass spectrometry</style></title></titles><keywords><keyword><style  face="normal" font="default" size="100%">analytical methodology</style></keyword><keyword><style  face="normal" font="default" size="100%">naphthenic acids</style></keyword><keyword><style  face="normal" font="default" size="100%">tailings water</style></keyword><keyword><style  face="normal" font="default" size="100%">UofA</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2007</style></year><pub-dates><date><style  face="normal" font="default" size="100%">01/2007</style></date></pub-dates></dates><publisher><style face="normal" font="default" size="100%">A Journal of Chromatography </style></publisher><volume><style face="normal" font="default" size="100%">1140</style></volume><pages><style face="normal" font="default" size="100%">4 pages </style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Naphthenic acids (general formula CnH2n+ZO2) are water-soluble, toxic compounds found in petroleum and bitumen. Some of the current methods for detecting these acids in waters depend on measuring the presence of the carboxylic acid functional group, and therefore many of these methods also detect naturally occurring carboxylic acids that are not naphthenic acids. We report a procedure that includes liquid–liquid extraction, cleanup, and derivatization to form t-butyldimethylsilyl esters prior to gas chromatography–mass spectrometry (GC–MS) analysis. Using low- and high-resolution MS to detect the ion C15H27O2Si+ (nominal m/z = 267) is an excellent indicator of the presence of naphthenic acids at concentrations ≥10 μg L−1.</style></abstract><custom3><style face="normal" font="default" size="100%">http://www.worldcat.org/oclc/5902164130</style></custom3><custom4><style face="normal" font="default" size="100%">OSEMB</style></custom4></record></records></xml>