<?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%">Clemente, Joyce S.</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%">Evaluation of the analyses of tert-butyldimethysilyl derivatives of naphthenic acids by gas cromatography-electron impact 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%">UofA</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2004</style></year><pub-dates><date><style  face="normal" font="default" size="100%">09/2004</style></date></pub-dates></dates><publisher><style face="normal" font="default" size="100%">Journal of Chromatography A </style></publisher><volume><style face="normal" font="default" size="100%">1047</style></volume><pages><style face="normal" font="default" size="100%">11 pages </style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Naphthenic acids are a complex mixture of carboxylic acids with the general formula CnH(2n+Z)O2 and they are natural, toxic components of crude oils. GC-MS analyses of tert-butyldimethylsilyl esters of naphthenic acids are used to estimate component distribution within naphthenic acids mixtures. Our evaluations of the GC-MS method showed that ions from column bleed erroneously appear as C14 Z = -4 acids and that correcting for heavy isotopes of C and Si do not significantly affect ion distribution plots. Overall, the GC-MS method appears to overestimate the relative proportion of low-molecular-mass acids. 

</style></abstract><issue><style face="normal" font="default" size="100%">1</style></issue><custom3><style face="normal" font="default" size="100%">http://www.worldcat.org/oclc/96960433</style></custom3><custom4><style face="normal" font="default" size="100%">OSEMB</style></custom4></record></records></xml>