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Standard purity and response factors of perfluorinated compounds

Authors
Naile, J.E.Khim, J.S.House, J.N.Jones, P.D.Giesy, J.P.
Issue Date
2010
Publisher
Taylor and Francis Ltd.
Keywords
Calibration; LC-MS/MS; PFCs; PFOA; PFOS
Citation
Toxicological and Environmental Chemistry, v.92, no.7, pp.1219 - 1232
Indexed
SCOPUS
Journal Title
Toxicological and Environmental Chemistry
Volume
92
Number
7
Start Page
1219
End Page
1232
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/118287
DOI
10.1080/02772240903397556
ISSN
0277-2248
Abstract
It has been reported that the relative response factors of isotopically labeled standards and unlabeled standards of the same perfluorinated compounds could be different. Individual (100 ng mL1) solutions of perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS) were analyzed using high-performance liquid chromatography tandem mass-spectrometry under negative-ion electrospray to detect any impurities present down to 0.5%-0.1% relative to the major component. Purity of the standards ranged from approximately 86% to ≥ 97%. Standard solutions of unlabeled and isotopically labeled materials were analyzed to compare the response factors of isotopically labeled analytes versus their nonlabeled counterparts in three different matrices at equivalent concentrations: organic solvent (methanol), serum extract, and water present individually and concurrently. Not all labeled analytes have the same response factor as their nonlabeled complement, and in at least one case the matrix in which the standard is present may cause significant suppression of response. Standard solutions of electrochemical fluorination produced PFOA and PFOS were quantified under multiple reaction monitoring mode, using calibration curves prepared from standards consisting primarily of linear standards only. The use of linear only standards may cause under-prediction of concentrations, and that the working range of these standards may be limited. © 2010 Taylor & Francis.
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