Download or read book Dioxins Analytical method for industrial wastes written by and published by . This book was released on 1980 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dioxins Analytical method for industrial wastes written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dioxins written by and published by . This book was released on 1980 with total page 67 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dioxins written by and published by . This book was released on 1980 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Techniques for Measurement and Removal of Dioxins and Furans written by Vaishali Shahare and published by CRC Press. This book was released on 2017-11-30 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a well organised treatise on identification and measurement of dioxins and furan in the environment. It focuses on their source, fate, behaviour, analytical techniques for measurement, and removal/control methods. Although there are numerous publications that address this subject, rarely are prevention and control concepts considered together in a single volume. This book provides a tool for today's environmental researchers by focusing on an integrated approach to managing environmental pollution problems due to dioxins and furans. The overall objective of this book is not simply to provide a general reference, but to serve as a resource for developing approaches to managing environmental pollution problems due to dioxins and furans.
Download or read book Characterization and Implementation of Analytical Methods for Dioxin Analysis written by Conner Stultz and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Polychlorinated dibenzo-p-dioxins and dibenzofurans, commonly called dioxins, have been compounds of concern for decades. Dioxins, along with polychlorinated biphenyls (PCBs) and polychlorinated naphthalenes (PCNs), are considered persistent organic pollutants or POPs. Dioxins, PCBs, and PCNs are halogenated aromatic compounds, and all three compounds pose similar toxicological concerns to animals. As the name POPs suggests, these compounds are known to be chemically stable in the environment and bioaccumulate in animals. There are numerous studies on the health effects of dioxins, PCBs, and PCNs in a variety of organisms. However, the low concentrations of these compounds found in the environment and their bio-accumulative effects raise concerns over chronic, rather than acute, health issues. The analysis of dioxins, PCBs, and PCNs is challenging due to their low concentration detection requirements, hundreds of possible congeners, and complicated sample matrix. Due to these challenges, the analysis of these compounds is generally performed by gas chromatography coupled to mass spectrometry (GC-MS). There are extensive studies published on the analysis of PCBs and dioxins on a variety of GC separation columns as well as studies on detection limits of the instrumentation used. However, there has been little focus on defining instrument performance, column selectivity, and identifying coelutions on various column phases, which is the goal of the following studies. Traditionally, dioxin analysis has been performed by gas chromatography coupled to a high-resolution mass spectrometer (GC-HRMS). GC-HRMS has historically provided the selectivity and sensitivity necessary to analyze dioxins; however, they are limited by the number of compounds they can monitor for at a time and are larger than newer benchtop models. Additionally, HRMS instruments are being phased out, due to issues with the metals used in the construction of the magnets. Benchtop mass spectrometers such as triple quadrupoles (MS/MS), quadrupole time of flight (Q-TOF), and TOF instruments are potentially capable of the same selectivity and sensitivity as the GC-HRMS system. These instruments offer advantages in the number of compounds that can be monitored for at a time and ease of use over the GC-HRMS. However, even with the advantages provided by these newer instruments, the GC-HRMS is still singled out as the instrument of choice in regulatory methods. A comparison was made between the GC-HRMS and five benchtop instruments with a method detection limit study to show that these newer instruments are capable of the same selectivity and sensitivity as the GC-HRMS system and can be used for regulatory dioxin analysis. Instrument sensitivity is an important factor in dioxin, PCB, and PCN analysis as these compounds are found at trace levels in the environment and animals. However, selectivity for these compounds is just as important a consideration as sensitivity. Dioxins have a possible 5020 unique congeners. That number includes the 210 chlorinated dioxins, 17 of which are considered toxic, 210 brominated dioxins, and 4600 mixed chlorinated/brominated compounds. PCBs have 209 chlorinated congeners, and PCNs have a possible 75 chlorinated congeners. Selecting the correct stationary phase is essential to characterize the toxicity of a sample accurately, as many of the congeners coelute. Nine popular GC columns were characterized for their ability to separate dioxins, PCBs, and PCNs using a retention index system. The retention index values for two columns were plotted against each other to obtain a selectivity graph. These graphs can be used to identify which columns provide the most significant selectivity difference for the compounds of interest. The retention indices generated also serve as a secondary means of analyte identification. These graphs were then used to identify a unique confirmation column pair for use with UESPA method 1613. The Rxi-17SilMS and Rtx-Dioxin2 columns showed unique selectivity for dioxins that can be used to fulfill the requirements of the USEPA-1613 method. Finally, this column combination is used with comprehensive 2-dimensional chromatography to develop a single analytical method to separate the toxic dioxin congeners from other dioxins and interfering compounds. The following research presented in chapters 2-6 has all been submitted for peer-reviewed publication. Chapter 2 has been published in the Journal of Mass Spectrometry. Chapter 3 has been published in the Journal of Chromatography A. Chapters 4, 5, and 6 are currently under peer review for publication in the Journal of Chromatography A. I directly contributed to all the research presented in this dissertation and am listed as the first author on all publications.
Download or read book Dioxin Perspectives written by Erich W. Bretthauer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 785 pages. Available in PDF, EPUB and Kindle. Book excerpt: Erich W. Bretthauer, Chairman of the Exposure and Hazard Assessment Working Group U. s. Environmental Protection Agency Washington, D. C. The efforts of the Exposure and Hazard Assessment Working Group were focused on the exchange of information on a variety of topics including research projects, regulations/statutes, analytical laboratories, and methods of exposure/risk assessment involving CDDs and CDFs. It was evident to the leaders of the Working Group that several of the knowledge voids had to be addressed on a fundamental level before expanded efforts could be made. Several questions needed to be answered: • Who has done research on this topic, and what do the data indicate? • Who is performing research now, and what are their capabilities? • How are other nations addressing this problem, and do they have legislative mandates in place? • Is there a general consensus on the topic? The members of the Working Group believed that these questions could be answered by surveying the major participants in the field of interest. Three principal survey efforts were performed by the Working Group, which collected information on research, regulations/statutes, and analytical laboratories from each of the participating nations. In addition to answering these fundamental questions, these efforts also fulfilled the major objectives of the entire Pilot Study. The collection, analysis, and distribution of information on research projects, regulations/statutes, and analytical laboratories were very useful efforts in helping to fill some of the basic knowledge voids.
Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on 1981 with total page 566 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Monthly Catalogue United States Public Documents written by and published by . This book was released on 1981 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Report summaries written by United States. Environmental Protection Agency and published by . This book was released on 1983 with total page 1584 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Indexes written by United States. Environmental Protection Agency and published by . This book was released on 1983 with total page 1760 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book New and Future Developments in Catalysis written by Steven L Suib and published by Newnes. This book was released on 2013-07-17 with total page 631 pages. Available in PDF, EPUB and Kindle. Book excerpt: New and Future Developments in Catalysis is a package of seven books that compile the latest ideas concerning alternate and renewable energy sources and the role that catalysis plays in converting new renewable feedstock into biofuels and biochemicals. Both homogeneous and heterogeneous catalysts and catalytic processes will be discussed in a unified and comprehensive approach. There will be extensive cross-referencing within all volumes.The various sources of environmental pollution are the theme of this volume. The volume lists all current environmentally friendly catalytic chemical processes used for environmental remediation and critically compares their economic viability. Offers in-depth coverage of all catalytic topics of current interest and outlines future challenges and research areas A clear and visual description of all parameters and conditions, enabling the reader to draw conclusions for a particular case Outlines the catalytic processes applicable to energy generation and design of green processes
Download or read book Analysis of Trace Organics in the Aquatic Environment written by B. K. Afghan and published by CRC Press. This book was released on 2017-07-28 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: A supplement to previous books edited by Afgan and Chau, this publication covers the practical aspects of analytical methodology for trace organics. The book reviews the published work on the occurance, distribution, fate, effect, and environmental impact of specific classes of compounds. Essential background information emphasizing practical aspects of various methods with respect to advantages and disadvantages of the published methods is also discussed.
Download or read book Dioxins written by and published by . This book was released on 1980 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dioxins Assessment of dioxin forming chemical processes written by M. P. Esposito and published by . This book was released on 1980 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book EPA Publications Bibliography written by United States. Environmental Protection Agency and published by . This book was released on 1985 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt:
