{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,8]],"date-time":"2026-09-08T12:07:07Z","timestamp":1788869227229,"version":"build-2803163510"},"reference-count":20,"publisher":"Wiley","issue":"9","license":[{"start":{"date-parts":[[2015,3,25]],"date-time":"2015-03-25T00:00:00Z","timestamp":1427241600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"name":"US Department of Energy"},{"DOI":"10.13039\/100006138","name":"Office of Environmental Management","doi-asserted-by":"crossref","id":[{"id":"10.13039\/100006138","id-type":"DOI","asserted-by":"crossref"}]},{"name":"Portsmouth\/Paducah Project Office"},{"name":"The Center for Intelligent Chemical Instrumentation"},{"name":"Department of Chemistry and Biochemistry"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Rapid Comm Mass Spectrometry"],"published-print":{"date-parts":[[2015,5,15]]},"abstract":"\n Rationale<\/jats:title>\n \n Using one or two\n 2<\/jats:sup>\n H\u2010atom\u2010labeled analogs as internal standards (ISs) may cause a 'cross\u2010contribution' problem (i.e., the overlap of ions from the IS and the analyte) especially for halogenated volatile organic compounds (VOCs). However, in this situation the overlapping peak clusters of the analyte and ISs can be resolved by multivariate chemometric methods such as classical least\u2010squares (CLS) and inverse least\u2010squares (ILS).\n <\/jats:p>\n <\/jats:sec>\n \n Methods<\/jats:title>\n \n Trichloroethylene (TCE) and its internal standard, deuterated TCE (TCE\u2010\n d<\/jats:italic>\n ), as model compounds, were analyzed using portable gas chromatography\/mass spectrometry. CLS and ILS were applied to resolve overlapping TCE and TCE\u2010\n d<\/jats:italic>\n mass spectral signals and evaluated for the determination of TCE. CLS and ILS models were constructed and used to predict concentration ratios of TCE to TCE\u2010\n d<\/jats:italic>\n . Calibration samples were prepared by adding TCE at different concentrations and TCE\u2010\n d<\/jats:italic>\n at 300\u00a0ng\u00a0mL\n \u20131<\/jats:sup>\n as an IS.\n <\/jats:p>\n <\/jats:sec>\n \n Results<\/jats:title>\n \n The calibration curve was linear over a range of 10\u20131000\u00a0ng\u00a0mL\n \u20131<\/jats:sup>\n with a coefficient of determination (\n R<\/jats:italic>\n 2<\/jats:sup>\n ) of 0.993. A validation data set collected 2\u00a0weeks later was used to further test the model robustness. Lower prediction errors and higher correlation coefficients were obtained from TCE\/TCE\u2010\n d<\/jats:italic>\n ratios predicted by the CLS model.\n <\/jats:p>\n <\/jats:sec>\n \n Conclusions<\/jats:title>\n \n This paper describes the first application of CLS to deconvolute overlapping peaks between an analyte and its corresponding isotopic internal standard for quantification. The proposed method enables simple isotopic analogs of analytes (one H or C atom is isotopically labeled) to be used as internal standards for analytes with isotopic distributions. It has wide application because of the environmental impact and prevalence of halogenated VOCs, especially when analytes have isotopic distributions that overlap with an internal standard or when sophisticated isotopic analogs of the analytes with three or more\n 2<\/jats:sup>\n H\u2010 or\/and\n 13<\/jats:sup>\n C\u2010atoms are prohibitively expensive or even impossible. Copyright \u00a9 2015 John Wiley & Sons, Ltd.\n <\/jats:p>\n <\/jats:sec>","DOI":"10.1002\/rcm.7164","type":"journal-article","created":{"date-parts":[[2015,3,25]],"date-time":"2015-03-25T04:20:53Z","timestamp":1427257253000},"page":"789-794","source":"Crossref","is-referenced-by-count":8,"title":["Application of chemometrics to resolve overlapping mass spectral peak clusters between trichloroethylene and its deuterated internal standard"],"prefix":"10.1002","volume":"29","author":[{"given":"Mengliang","family":"Zhang","sequence":"first","affiliation":[{"name":"Center for Intelligent Chemical Instrumentation, Clippinger Laboratories, Department of Chemistry and Biochemistry Ohio University Athens OH 45701\u20102979 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peter de B.","family":"Harrington","sequence":"additional","affiliation":[{"name":"Center for Intelligent Chemical Instrumentation, Clippinger Laboratories, Department of Chemistry and Biochemistry Ohio University Athens OH 45701\u20102979 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2015,3,25]]},"reference":[{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1289\/ehp.00108s2359"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.1002\/bmc.488"},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.1080\/15459620701301763"},{"key":"e_1_2_7_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/0300-483X(96)03382-3"},{"key":"e_1_2_7_6_1","doi-asserted-by":"publisher","DOI":"10.3390\/ijerph8114238"},{"key":"e_1_2_7_7_1","doi-asserted-by":"publisher","DOI":"10.1289\/ehp.00108s2161"},{"key":"e_1_2_7_8_1","first-page":"124","volume-title":"Toxicological profile for trichloroethylene","author":"ATSDR","year":"1997"},{"key":"e_1_2_7_9_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0278-6915(97)00090-2"},{"key":"e_1_2_7_10_1","volume-title":"Tricholoethylene Health Risk Assessment: Synthesis and Characterization. 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