Download or read book Development of Enhanced Analytical Methods for Ultratrace Determination of Mercury in Natural Water written by Jessica Huber and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Ultratrace Analysis of Mercury and Its Distribution in Some Natural Waters in the United States written by David A. Roth and published by . This book was released on 1994 with total page 618 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Mercury Ultra Trace Analysis written by Dr. Paul Gouda and published by iUniverse. This book was released on 2013-06-19 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dr. Paul H. Ramses Gouda, is a globally renowned chemist who authored several science books and papers. He has been credited with the foundation of several analytical laboratory procedures utilizing Atomic Absorption and Inductively Coupled Plasma for ultra trace analysis of As, Se, Sb &Hg. These Methods were officially adopted by EPL and by other agencies, and as routinely practiced in the scientific arena they were named after him. The author, who first attended medical school before specializing in analytical chemistry and pharmacological research, has acquired two doctorates. His contributions to the scientific community include a recent paper on the unique concept of the duplication and manipulation of neurological compounds to trigger a natural and optimum physiological response. Tour the authors books at and his book-signing sessions at www.goudabooks.com and his science project, scheduled symposiums & seminars at www.optimumgreen.com This book offers a complete coverage of mercury analysis methodology. An analytical laboratory reference, a chemist manual, and a university textbook. A must for every library.

Download or read book Methods of Analysis by the U S Geological Survey National Water Quality Laboratory written by John R. Garbarino and published by . This book was released on 2001 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Analysis for Mercury in Water written by John A. Winter and published by . This book was released on 1972 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Development and Application of an Analytical Technique for the Determination of Methylmercury Compounds in Environmental Samples Based on Isolation by Distillation Followed by Purge and trap Sample Concentration and GC MS Separation and Detection After Aqueous Phase Ethylation with Sodium Tetraethylborate written by William R. Rice and published by . This book was released on 2000 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt: An analytical technique has been developed for the determination of methylmercury compounds in environmental samples. The technique is based on a two-stage procedure. In the first stage, methylmercury compounds are isolated from the sample matrix as methylmercury chloride (MeRgCl) by distillation. The distillation procedure is based on a series of published methods for the determination of methylmercury compounds in sediment and natural waters. In the second stage, MeRgCl is converted to the more volatile methylethylmercury (MeRgEt) by derivatization with an aqueous solution of sodium tetraethylborate. The volatile species is then determined by purge-and-trap sample concentration and gas chromatography/mass spectrometry (GC/MS) separation and detection. Initial work focused on the development of the method with optimization of the experimental parameters and operating conditions associated with the distillation and final measurement steps. The concentration of MeHgCl in standard solutions (concentration range from 0-30 ng/L as Hg), with and without nitric acid preservation, was monitored as a function of storage time to evaluate storage losses. Aqueous solutions of MeHgCl at the ng/L level are very stable for at least three months if stored (1) in the dark at 4 DC, (2) in acid-cleaned polypropylene flasks, (3) and without nitric acid preservation. Rapid loss of MeHgCl was observed for solutions acidified with nitric acid and stored under identical conditions (25% and 40% decrease in signal response after 3 and 96 days, respectively). The analytical technique was applied to the determination of methylmercury compounds in lake-bottom sediment and surface-water samples collected from Cottage Grove Reservoir, located in Lane County, Oregon. The concentration of methylmercury in a surface-water sample was 2.1 ± 0.11 ng/L as Hg(II). Recoveries of approximately 100 percent were observed for surface-water samples spiked with MeHgCl to a level of 4 ng as Hg(II). Concentrations of methylmercury in lake-bottom sediment ranged from 0.143 ± 0.008 to 35 ± 3.1 ng/g sediment as Hg(II) (wet weight). Recoveries of approximately 90 percent were observed for sediment samples spiked with MeHgCl to a level of 15 ng as Hg(II). The reproducibility of the entire analytical technique and the measurement step alone were evaluated through the analysis of replicate sediment samples. The percent relative standard deviation (RSD) of the entire analytical procedure was 2.6 percent, while the percent RSD of the measurement step alone was determined to be 1.5 percent. The absolute detection limit for MeHgCl was determined to be 4 pg as Hg(II) for the analysis of a 40-mL sample volume.

Download or read book ERDA Energy Research Abstracts written by United States. Energy Research and Development Administration and published by . This book was released on 1977 with total page 906 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Mercury in Water written by Water Resources Scientific Information Center and published by . This book was released on 1975 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Mercury in Water written by and published by . This book was released on 1975 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ERDA Energy Research Abstracts written by United States. Energy Research and Development Administration. Technical Information Center and published by . This book was released on 1977 with total page 982 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Development and Optimization of Instrumental and Radiochemical Procedures for Ultra trace Analysis of Mercury in Biological Matrices Employing Neutron Activation Analysis written by Andrew Giles Meade and published by . This book was released on 1995 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Mercury in Water written by Water Resources Scientific Information Center and published by . This book was released on 1972 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Development and Evaluation of an Analytical Method for the Determination of Total Atmospheric Mercury written by D. L. Chase and published by . This book was released on 1972 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Rapid Sensitive and Direct Analysis of Ultra trace Quantities of Mercury in Water Samples written by Gholam H. Pahlavan and published by . This book was released on 2001 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1987 with total page 656 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Methods of Analysis by the U S Geological Survey National Water Quality Laboratory written by John R. Garbarino and published by . This book was released on 2001 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Determination of Mercury and Antimony in Environmental and Food Matrices written by Sergio Carneado Moreno and published by . This book was released on 2016 with total page 245 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Food safety is an issue of vital importance in the world. It must be sustained so as to avoid pollution episodes in food, which subsequently could cause potential risks to health. The main approach of this thesis consist of the study of two particular food contamination cases: primary contamination of the aquatic media and the corresponding seafood with mercury, and direct contamination of beverages due to polyethylene terephthalate containers (PET) with antimony. To carry out these studies, the work was structured in three sections. The first one is the development of analytical methodology for the correct determination of mercury and antimony, in which atomic fluorescence spectrometry and inductive coupled plasma mass spectrometry were used to know the total content, whereas the coupling of the liquid chromatography to these detector was used for speciation. Additionally, online preconcentration methods for the speciation of these elements were successfully developed to determine the trace amounts present in the matrices under study, comprising tap and PET-bottled waters. The second section deals with the application of the developed methodology in real samples. Antimony was determined in PET-bottled waters, juices, spirits and PET bottles, obtaining concentrations under the limits established for the European Union, and different species depending on the matrix: Sb(V) for waters, Sb(III) for juices and both for spirits and PET extracts. Mercury was determined in seafood, obtaining concentrations beyond the limits for four predator fish, being methylmercury the predominant species. The third section consists of the study of the mechanisms of antimony migration from PET to beverages. To know the main variables which enhances migration, studies with waters, juices and spirits were performed at different times and temperatures. Results demonstrated that high temperatures (60oC) enhanced migration, as antimony concentration rapidly increased and the limit permitted was exceeded in waters and spirits. Differences among the matrices studied and the tendencies observed throughout time demonstrated that not only temperature, but also matrix characteristics and the type of PET had influence on migration. These facts were demonstrated with the performance of crossed migration experiments, using different types of PET bottles for the storage of the aforementioned matrices". -- TDX.