The Analysis Of Trihalomethanes In Drinking Water By Liquid Liquid Extraction
DOWNLOAD
Download The Analysis Of Trihalomethanes In Drinking Water By Liquid Liquid Extraction PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get The Analysis Of Trihalomethanes In Drinking Water By Liquid Liquid Extraction book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages. If the content not found or just blank you must refresh this page
The Analysis Of Trihalomethanes In Drinking Water By Liquid Liquid Extraction
DOWNLOAD
Author :
language : en
Publisher:
Release Date : 1977
The Analysis Of Trihalomethanes In Drinking Water By Liquid Liquid Extraction written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Drinking water categories.
The Analysis Of Trihalomethanes In Drinking Water By Liquid Liquid Extraction
DOWNLOAD
Author : Environmental Monitoring and Support Laboratory (Cincinnati, Ohio). Physical and Chemical Methods Branch
language : en
Publisher:
Release Date : 1979
The Analysis Of Trihalomethanes In Drinking Water By Liquid Liquid Extraction written by Environmental Monitoring and Support Laboratory (Cincinnati, Ohio). Physical and Chemical Methods Branch and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with Drinking water categories.
Trihalomethanes In Drinking Water
DOWNLOAD
Author : HJ. Brass
language : en
Publisher:
Release Date : 1979
Trihalomethanes In Drinking Water written by HJ. Brass and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with Drinking water categories.
A liquid-liquid extraction (LLE) procedure is discussed in relation to the proposed U.S. Environmental Protection Agency regulation of trihalomethane (THM) levels in drinking water. It consists of the extraction of THMs from aqueous samples into an organic solvent followed by electron capture gas chromatographic analysis. A comparison is made of the THM data obtained by both LLE and purge and trap analyses of duplicate samples of drinking water. Both procedures utilize aqueous THM standards and quality control samples. Given suitably purified solvents and blank water, the four THMs can be quantified at the low microgram per litre concentrations required in the proposed regulation. The stability of samples and standards, reagent purification, and the possible extension of the LLE procedure to the qualitative and quantitative measurement of other volatile organohalides are considered.
Trihalomethanes In Drinking Water
DOWNLOAD
Author :
language : en
Publisher:
Release Date : 1983
Trihalomethanes In Drinking Water written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with Drinking water categories.
Two Methods For Analyzing Trihalomethanes In Drinking Water By Purge And Trap And Liquid Liquid Extraction Techniques
DOWNLOAD
Author :
language : en
Publisher:
Release Date : 1984
Two Methods For Analyzing Trihalomethanes In Drinking Water By Purge And Trap And Liquid Liquid Extraction Techniques written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with Drinking water categories.
Methods For The Determination Of Organic Compounds In Drinking Water
DOWNLOAD
Author :
language : en
Publisher:
Release Date : 1990
Methods For The Determination Of Organic Compounds In Drinking Water written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Drinking water categories.
Optimization Of Solid Phase Microextraction For Determination Of Disinfection By Products In Water
DOWNLOAD
Author : Farhad Riazi Kermani
language : en
Publisher:
Release Date : 2012
Optimization Of Solid Phase Microextraction For Determination Of Disinfection By Products In Water written by Farhad Riazi Kermani and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
A new technique for sample preparation and trace analysis of organic pollutants in water using mixed-phase thin film (MPTF) devices, combined with direct thermal desorption, cold trapping, gas chromatography-mass spectrometry (GC-MS) is presented for the first time. Two novel analytical devices, Carboxen/polydimethylsiloxane (CAR/PDMS) and polydimethylsiloxane/divinylbenzene (PDMS/DVB) TF samplers were fabricated using spin coating technique and glass wool fabric mesh as substrate. The samplers were easily tailored in size and shape by cutting tools. Good durability and flat-shape stability were observed during extractions and stirring in water. The latter characteristic obviates the need for an extra framed holder for rapid thin film microextraction (TFME) and makes the samplers more robust and user-friendly. The analytical performance of the MPTF devices was satisfactorily illustrated and compared with those of solid phase microextraction (SPME) fibers and PDMS thin film membrane using water samples spiked with seven N-nitrosamines (NAs), known as disinfection by-products (DBPs) in drinking water. Marked enhancement of extraction efficiencies (typically more than one order of magnitude) for the N-nitrosamines, including the hydrophilic ones, was obtained with the MPTF devices under generally pre-equilibrium conditions, compared to the SPME fibers and PDMS thin film membrane. The analytical results obtained in this study, including linearity, repeatability and detection levels at low ng/L for the tested compounds, indicate that the new thin film devices are promising for rapid sampling and sample preparation of trace levels of polar organic pollutants in water with sensitivities higher than SPME fibers and with a wide application range typical of mixed-phase coatings. The user-friendly format and robustness of the novel devices are also advantageous for on-site applications, which is the ultimate use of thin film samplers. Moreover, the thin film fabrication approach developed in this study offers the possibility of making other novel samplers with PDMS or different absorptive polymers such as polyacrylate (PA) and polyethylene glycol (PEG) as particle-free, or as particle-loaded thin films with a variety of adsorptive solid particles. In another development in the course of this research, the performance and accuracy of the SPME fiber approach for sample preparation of selected DBPs were demonstrated and compared with the conventional liquid-liquid extraction (LLE) method by real drinking water samples analysis in collaboration with Health Canada. Four regulated trihalomethanes (THMs) and seven other DBPs known as priority by-products, including four haloacetonitriles, two haloketones and chloropicrin, were analyzed in real samples during two separate comparative studies. In each study, duplicate samples from several water treatment and distribution systems in Canada, collected and stabilized under the same protocol, were analyzed in parallel by two independent labs; in the University of Waterloo by an optimized headspace SPME-GC-MS and in Health Canada by a LLE-GC-ECD (electron capture detection) method equivalent to EPA 551.1. The values for the concentration of the analytes in the samples obtained by the two methods were in good agreement with each other in majority of the cases indicating that SPME affords the promise of a dependable sample preparation technique for rapid DBPs analysis. In particular, it was shown that the SPME fiber approach combined with GC-MS is a fast reliable alternative to the LLE-GC-ECD (EPA 551.1) method for analysis of the regulated THMs in the concentration ranges that are typical and relevant for drinking water samples.
Development And Evaluation Of Analytical Procedures For Broad Spectrum Analysis Of Synthetic Organic Chemicals In Source And Finished Drinking Waters
DOWNLOAD
Author : Gregory S. Durell
language : en
Publisher:
Release Date : 1987
Development And Evaluation Of Analytical Procedures For Broad Spectrum Analysis Of Synthetic Organic Chemicals In Source And Finished Drinking Waters written by Gregory S. Durell and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Spectrum analysis categories.
Analyzing Organics In Drinking Water
DOWNLOAD
Author :
language : en
Publisher:
Release Date : 1981
Analyzing Organics In Drinking Water written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with Science categories.
Economic Impact Analysis Of A Trihalomethane Regulation For Drinking Water
DOWNLOAD
Author : United States. Environmental Protection Agency. Office of Water Supply
language : en
Publisher:
Release Date : 1977
Economic Impact Analysis Of A Trihalomethane Regulation For Drinking Water written by United States. Environmental Protection Agency. Office of Water Supply and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Decision making categories.