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Main Title Interlaboratory Comparison of Thermospray and Particle Beam Liquid Chromatography/Mass Spectrometry Interfaces: Evaluation of a Chlorinated Phenoxy Acid Herbicide Liquid Chromatography/Mass Spectrometry Analysis Method.
Author Jones, T. L. ; Betowski, L. D. ; Lesnik, B. ; Chiang, T. C. ; Teberg, J. E. ;
CORP Author Lockheed Engineering and Sciences Co., Inc., Las Vegas, NV. ;Department of Energy, Washington, DC. Lab. Management Div.;Environmental Monitoring Systems Lab., Las Vegas, NV.
Publisher c1991
Year Published 1991
Report Number EPA-68C-00049; EPA/600/J-91/317;
Stock Number PB92-124734
Additional Subjects Herbicides ; Chemical analysis ; Liquid chromatography ; Mass spectroscopy ; Interlaboratory comparisons ; Pesticides ; Chlorine organic compounds ; Performance evaluation ; Extraction ; Experimental design ; Dinoseb ; Reprints ; Thermospray liquid chromatography ; Silvex ; Propanoic acid/(trichlorophenoxy)
Library Call Number Additional Info Location Last
NTIS  PB92-124734 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 7p
Seven laboratories participated in an interlaboratory evaluation of a liquid chromatography/mass spectrometry (LC/MS) method for the analysis of 10 chlorinated phenoxy acid herbicides. The focus of the evaluation was to test the intercomparability of LC/MS data obtained from two types of LC/MS interfaces (i.e., thermospray (TS) and particle beam (PB)). Eight simulated sample extracts were sent to each laboratory for LC/MS analysis. There were statistically significant differences between interfaces in the quantitative data for all analytes except 2-(2,4,5-trichlorophenoxy) propanoic acid (silvex). Particle beam exhibited a high positive bias and a low relative standard deviation at the highest sample extract concentration range, 500 micrograms/mL, while TS showed a low bias and a low relative standard deviation at the lowest sample extract concentration range, 5 micrograms/mL. Another factor of the study was to look for any performance differences between interfaces of the same type, but differing manufacturers. A statistical difference was observed, between PB interfaces, for 2-(1-methylpropyl)-4,6-dinitrophenol (dinoseb). (Copyright (c) 1991 by the American Chemical Society.)