Quantitative Determination of Priority Pollutants--Gas Chromatography-Mass Spectrometry Response Factor Variation PDF Download
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Author: R. Devine Publisher: ISBN: Category : Compound chromatography variation Languages : en Pages : 13
Book Description
The quantitative gas chromatography-mass spectroscopy-data system technique recommended by the Environmental Protection Agency for the determination of "extractable priority pollutants" in industrial effluent extracts has been evaluated. For standard solutions, the relative standard deviation (correlation coefficient) for selected priority pollutant response factors was considered as a measure of the precision of one aspect of the quantification of organic compounds in water extracts. It has been shown that for compounds similar in physical properties to the internal standard (anthracene-d10), single-level response factors can be determined at low nanogram levels with correlation coefficients as good as 1.2 percent. Data are presented that suggests that, for compounds that are "well behaved" from the viewpoint of consistent and reproducible gas chromatographic elution, the correlation coefficient of the response factor can be independent of the ion employed for quantification. Correlation coefficients of response factors for packed column and capillary column experiments demonstrated, not surprisingly, that response factor variation is compound dependent. For most cases cited, the relative standard deviation (RSD) of the response factor was less than 20 percent. However, for certain priority pollutants, response factor variation indicated that the recommended analysis protocol has serious deficiencies.
Author: R. Devine Publisher: ISBN: Category : Compound chromatography variation Languages : en Pages : 13
Book Description
The quantitative gas chromatography-mass spectroscopy-data system technique recommended by the Environmental Protection Agency for the determination of "extractable priority pollutants" in industrial effluent extracts has been evaluated. For standard solutions, the relative standard deviation (correlation coefficient) for selected priority pollutant response factors was considered as a measure of the precision of one aspect of the quantification of organic compounds in water extracts. It has been shown that for compounds similar in physical properties to the internal standard (anthracene-d10), single-level response factors can be determined at low nanogram levels with correlation coefficients as good as 1.2 percent. Data are presented that suggests that, for compounds that are "well behaved" from the viewpoint of consistent and reproducible gas chromatographic elution, the correlation coefficient of the response factor can be independent of the ion employed for quantification. Correlation coefficients of response factors for packed column and capillary column experiments demonstrated, not surprisingly, that response factor variation is compound dependent. For most cases cited, the relative standard deviation (RSD) of the response factor was less than 20 percent. However, for certain priority pollutants, response factor variation indicated that the recommended analysis protocol has serious deficiencies.
Author: Brian Middleditch Publisher: Springer Science & Business Media ISBN: 1468437887 Category : Science Languages : en Pages : 316
Book Description
When the list of organic priority pollutants was first published, many mass spec troscopists went scrambling to their reference books. GC-MS was mandated for the analysis of 114 compounds, yet the spectra of many of them, if they had been recorded at all, were scattered throughout the literature. Moreover, it soon became apparent that, even if a sufficient number of instruments could be made available to undertake the task of monitoring 114 substances in the effluents of 21 categories of industry, the personnel could not be trained to perform the analyses and interpret the results. The solution to this problem has been the development of highly automated mass spectrometers which can be operated by personnel without the traditional research training. This book is for the new breed of mass spectroscopist who is not interested in the esoteric details of mass spectral fragmentation, but who merely wishes to identify specific pollutants in effluents. Our inclusion of com prehensive lists of synonyms and bibliographic data should make the book of even greater value to the reader who is not too familiar with the idiosyncrasies of chemical nomenclature and the scientific literature. The experienced mass spectroscopist should also benefit from having all of the data collected together in one volume. This is a book to be used, rather than deposited in a library distant from the laboratory: we would hope that it will fmd a place on top of every mass spectrometer used for the analysis of priority pollutants.
Author: RF. Devine Publisher: ISBN: Category : Bellar-Lichtenburg method Languages : en Pages : 22
Book Description
A method utilizing computerized gas chromatography-mass spectrometry (GC-MS) is presented for qualitative and quantitative determination of volatile organics in drinking waters, natural waters, or industrial effluent waters. It is based on the addition of deuterated internal standard, 1,2-dichlorethane-d4, to an appropriate-sized portion of sample and use of the Bellar-Lichtenberg method of purge-trap-desorb into determinative instrument. Method validation consisted of analyzing volatile priority pollutants at 2, 10, 50, 100, and 200 ppb with internal standard at 20 ppb in each of seven replicate analysis at each dose. Comparison of relative standard deviations (RSD) of internal and external standard methods of GC-MS analysis revealed no significant differences. This study also yielded valuable information concerning repeatability, reproducibility, stability of internal standard, linear dynamic range of GC-MS, and RSD variation with different area regenerations of diagnostic atomic mass units. Pollutant identification is based on retention time and total mass spectral comparison with authentic compound. Quantitation is based on measurement of the areas of retrieved diagnostic atomic mass unit regeneration of contaminant and internal standard. Using response factors determined from analysis of standard mixtures containing compounds of interest and internal standard, and the known mass of internal standard, the concentration is calculated. Lower detection limit for the volatile priority pollutants is approximately 1 ?g/litre. This method has detected several volatiles that are not Environmental Protection Agency priority pollutants.
Author: Paul R. Loconto Publisher: CRC Press ISBN: 1420030566 Category : Science Languages : en Pages : 743
Book Description
Trace Environmental Quantitative Analysis: Principles, Techniques, and Applications, Second Edition offers clear and relevant explanations of the principles and practice of selected analytical instrumentation involved in trace environmental quantitative analysis (TEQA). The author updates each chapter to reflect the latest improvements in TEQA that
Author: R. Devine
Author: R. Devine
Author: Brian Middleditch
Author: RF. Devine
Author: C. E. Van Hall
Author: Jayant D. Shringarpure
Author: C. E. Van Hall
Author: 
Author: Paul R. Loconto
Author: 
Author: Canada. Environment Canada. ENVIRONMENTAL PROTECTION SERVICE. WASTEWATER TECHNOLOGY CENTRE.