Electroanalysis and Chemometrics of Speciation of Natural Waters PDF Download
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Languages : en
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Languages : en
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Author: Joseph Wang
Publisher:
ISBN:
Category : Trace elements
Languages : en
Pages : 46
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Category : Conference proceedings
Languages : en
Pages : 976
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Author: Zhaoshun Bi
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Category :
Languages : en
Pages :
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The speciation of trace metals plays a very important role in conditioning their biogeochemical cycles in the marine system. Their species are found to be strongly related to organic matters such as humic acids (HA) and fulvic acids (FA). This thesis aims to develop appropriate techniques to improve our understanding of the speciation of some trace metals, mainly in marine waters. Lead (Pb), cadmium (Cd) and chromium (Cr) which are widely used in industry were analytzed. The concentration of lead in uncontaminated seawater is between 10 and 100 pM, whilst in coastal waters it is higher at up to low nanomolar levels. Little is known about the chemical speciation of lead since it is difficult to be determined at picomolar levels. The work in this dissertation was to develop a suitable electrode and procedure to determine lead in seawater, with the objective that the electrode could be applied for in-situ measurement (without reagents) and for speciation. Several electrodes and materials were tested, including a solid bismuth rod and different microwire materials. Vibration was used to enhance mass transport, instead of solution stirring, to decrease detection limits and facilitate in-situ monitoring. The bismuth electrode was found to be suitable for monitoring lead in coastal waters: it is mercury-free and therefore environmentally friendly, but insufficiently sensitive for oceanic lead concentrations. Comparison of microwires of carbon, gold and silver showed that all of these bare electrodes give a signal for lead, but they suffer variable interference from cadmium, although this is minor if the cadmium concentration is lower than lead. A large improvement was obtained by coating the electrodes with mercury, which gave good peak resolution between cadmium and lead, and good sensitivity. The carbon and gold electrodes had good reproducibility and sensitivity when the mercury was renewed for each measurement. Once coated with mercury, the silver electrode formed amalgam with the silver which could not be completely removed. This electrode was thus not suitable to be used as a renewable mercury film electrode. However, as a permanently amalgamated silver electrode, it was found to have good sensitivity for lead, good separation from cadmium, and was stable for long time usage. This electrode, the silver amalgam microwire (SAM) electrode, was selected for further speciation study of Pb in oceanic waters. Optimum conditions for using the SAM electrode for trace lead detection in seawater involve the use of conditioning potentials. The limit of detection for lead was 4 pM lead in acidified seawater and 12 pM lead in seawater of pH 8. The higher limit of detection at pH 8 is due to the inorganic speciation at that pH. The SAM electrode was successfully used for pseudopolarography of lead to determine its organic complexation. This method was calibrated using model compounds and applied for the first time to estuarine, coastal and oceanic samples at natural concentrations of Pb. It was found that lead occurs mostly as a labile (reactive, organic) species, with a smaller fraction as a strongly organically bound species. The SAM electrode was also tested for chromium analysis using cathodic stripping voltammetry (CSV) in natural waters. Its detection limit is as good as the mercury drop electrode but reduces consumption of mercury.
Author: John David Ronald Thomas
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 236
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This historical review describes the events leading up to amalgamation and covers the subsequent activities of the Analytical Division up to the present day.
Author: Sergio Caroli
Publisher: Elsevier Science & Technology
ISBN:
Category : Juvenile Nonfiction
Languages : en
Pages : 428
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Cover -- Contents -- Contributors -- Preface -- Chapter 1. Environmental chemistry in Antarctica: the quest for accuracy -- Chapter 2. A scientific framework for environmental monitoring in Antarctica -- Chapter 3. Trace element determination in polar snow and ice. An overview of the analytical process and application in environmental and paleoclimatic studies -- Chapter 4. Natural isotopic variations in lead in polar snow and ice as indicators of source regions -- Chapter 5. Trace metals in Antarctic sea water -- Chapter 6. Trace metals monitoring as a tool for characterization of Antarctic ecosystems and environmental management. The Argentine programme at Jubany Station -- Chapter 7. Biomethylation in the Southern Ocean and its contribution to the geochemical cycle of trace elements in Antarctica -- Chapter 8. Trace metals in particulate and sediments -- Chapter 9. Polychlorobiphenyls in Antarctic matrices -- Chapter 10. Certified reference materials in Antarctic matrices: developme ...
Author: Leo M.L. Nollet
Publisher: CRC Press
ISBN: 1439889643
Category : Science
Languages : en
Pages : 999
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Extensively revised and updated, Handbook of Water Analysis, Third Edition provides current analytical techniques for detecting various compounds in water samples. Maintaining the detailed and accessible style of the previous editions, this third edition demonstrates water sampling and preservation methods by enumerating different ways to measure chemical and radiological characteristics. It gives step-by-step descriptions of separation, residue determination, and clean-up techniques. See What’s New in the Second Edition: Includes five new chapters covering ammonia, nitrates, nitrites, and petroleum hydrocarbons, as well as organoleptical and algal analysis methodology Compares older methods still frequently used with recently developed protocols, and examines future trends Features a new section regarding organoleptical analysis of water acknowledging that ultimately the consumers of drinking water have the final vote over its quality with respect to odor, flavor, and color The book covers the physical, chemical, and other relevant properties of various substances found in water. It then describes the sampling, cleanup, extraction, and derivatization procedures, and concludes with detection methods. Illustrated with procedure flow charts and schematics, the text includes numerous tables categorizing methods according to type of component, origin of the water sample, parameters and procedures used, and application range. With contributions from international experts, the book guides you through the entire scientific investigation starting with a sampling strategy designed to capture the real-world situation as closely as possible, and ending with an adequate chemometrical and statistical treatment of the acquired data. By organizing data into more than 300 tables, graphs, and charts, and supplementing the text with equations and illustrations, the editors distill a wealth of knowledge into a single accessible reference.
Author: Leo M.L. Nollet
Publisher: CRC Press
ISBN: 1420006312
Category : Science
Languages : en
Pages : 786
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Book Description
Extensively revised and updated, Handbook of Water Analysis, Second Edition provides current analytical techniques for detecting compounds in water samples. Maintaining the detailed and accessible style of the original, this edition demonstrates water sampling and preservation methods by enumerating different ways to measure chemical and radiologic
Author: Yan Shao
Publisher: BoD – Books on Demand
ISBN: 9535100327
Category : Science
Languages : en
Pages : 254
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Book Description
Currently the research field of electrochemical cells is a hotspot for scientists and engineers working in advanced frontlines of micro-, nano- and bio-technologies, especially for improving our systems of energy generation and conversation, health care, and environmental protection. With the efforts from the authors and readers, the theoretical and practical development will continue to be advanced and expanded.
Author:
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ISBN:
Category : Public health
Languages : en
Pages : 832
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