Chemical and Photochemical Transformation of Selected Pesticides in Aquatic Systems

Chemical and Photochemical Transformation of Selected Pesticides in Aquatic Systems

Author: N. Lee Wolfe

Publisher:

Published: 1976

Total Pages: 156

ISBN-13:

DOWNLOAD EBOOK

"This report presents the results of laboratory studies to quantitatively predict chemical and photochemical transformation rates and products of pesticides in water. It includes a general discussion of relevant transformation processes and associated kinetic expressions. The processes treated in most detail are hydrolysis, direct photolysis, and reaction with singlet oxygen. Implications of other processes such as oxidation and sensitized photolysis are also discussed. Results of detailed studies are included for the pesticides, malathion, carbaryl, methoxychlor, captan, and 2,4-D esters. The measured rate constants and half-lives indicate that chemical and/or photochemcial processes of these compounds are likely to be important in the aquatic environment. Less extensive data is presented for the pesticides, atrazine, diazinon, parathion, and toxaphene, along with a discussion of available literature data.


The Kinetics of Environmental Aquatic Photochemistry

The Kinetics of Environmental Aquatic Photochemistry

Author: Asa Leifer

Publisher:

Published: 1988

Total Pages: 344

ISBN-13:

DOWNLOAD EBOOK

Now in one source---the theory and practice for determining environmentally relevant rates of photoreaction in aquatic media. Works out all mathematic deriviations, step by step. Shows how to select experimental procedures for measuring rates of aqueous photoreaction. Details how to measure rates at very low concentrations. Also describes theory and practice of chemical actinometry. Shows how to measure rates of direct and indirect aqueous photoreaction by outdoor experiments in sunlight and laboratory experiments using monochromatic light. Describes detailed experimental procedures for obtaining requisite kinetic data. Gives comprehensive tables of solar irradiance as a function of latitude and season of the year in the northern hemisphere. Illustrates how to use data from kinetic experiments to estimate rates of direct and indirect photoreaction in aquatic media in the environment.


Aquatic and Surface Photochemistry

Aquatic and Surface Photochemistry

Author: George R. Helz

Publisher: CRC Press

Published: 2018-01-10

Total Pages: 571

ISBN-13: 1351078291

DOWNLOAD EBOOK

Aquatic and Surface Photochemistry provides a broad overview of current research in the emerging field of environmental aquatic and surface photochemistry. Selected reviews and current research articles are blended to provide an in-depth treatment of various aspects of this research area. The first part of the text deals with photochemistry in the environment, covering recent research on the following topics: aquatic photochemistry of organic pollutants and agrochemicals, photochemical cycling of carbon and transition metals (especially iron), photochemical formation of reactive oxygen species in natural waters, photoreaction in cloud and rain droplets, and photoreactions on environmental surfaces (soil, ash, metal, oxide). The second part provides discussions and data on both heterogeneous photocatalytic and homogeneous processes, with topics ranging from applications to mechanistic studies. These chapters illustrate the wide diversity of pollutant classes that are degradable by photochemical techniques and the effects of various reaction conditions on the rates and efficiency of the techniques. Current kinetic studies are presented, which provide new information about the role of adsorption and the nature of the reactive oxidizing species that mediate these photoremediation processes.This book will interest civil, chemical, and environmental engineers, as well as chemists, soil scientists, geochemists, and atmospheric chemists.


Environmental Photochemistry

Environmental Photochemistry

Author: Pierre Boule

Publisher: Springer Science & Business Media

Published: 1999

Total Pages: 384

ISBN-13: 9783540629139

DOWNLOAD EBOOK

Environmental Chemistry is a relatively young science. Interest in this subject, however, is growing very rapidly and, although no agreement has been reached as yet about the exact content and limits of this interdisciplinary discipline, there appears to be increasing interest in seeing environmental topics which are based on chemistry embodied in this subject. One of the first objectives of Environ mental Chemistry must be the study of the environment and of natural chemical processes which occur in the environment. A major purpose of this series on Environmental Chemistry, therefore, is to present a reasonably uniform view of various aspects of the chemistry of the environment and chemical reactions occurring in the environment. The industrial activities of man have given a new dimension to Environ mental Chemistry. We have now synthesized and described over five million chemical compounds and chemical industry produces about hundred and fifty million tons of synthetic chemicals annually. We ship billions of tons of oil per year and through mining operations and other geophysical modifications, large quantities of inorganic and organic materials are released from their natural deposits. Cities and metropolitan areas of up to 15 million inhabitants produce large quantities of waste in relatively small and confined areas. Much of the chemical products and waste products of modern society are released into the environment either during production, storage, transport, use or ultimate disposal. These released materials participate in natural cycles and reactions and frequently lead to interference and disturbance of natural systems.


Chemical Kinetics and Process Dynamics in Aquatic Systems

Chemical Kinetics and Process Dynamics in Aquatic Systems

Author: PatrickL. Brezonik

Publisher: Routledge

Published: 2018-05-08

Total Pages: 784

ISBN-13: 1351461516

DOWNLOAD EBOOK

Chemical Kinetics and Process Dynamics in Aquatic Systems is devoted to chemical reactions and biogeochemical processes in aquatic systems. The book provides a thorough analysis of the principles, mathematics, and analytical tools used in chemical, microbial, and reactor kinetics. It also presents a comprehensive, up-to-date description of the kinetics of important chemical processes in aquatic environments. Aquatic photochemistry and correlation methods (e.g., LFERs and QSARs) to predict process rates are covered. Numerous examples are included, and each chapter has a detailed bibliography and problems sets. The book will be an excellent text/reference for professionals and students in such fields as aquatic chemistry, limnology, aqueous geochemistry, microbial ecology, marine science, environmental and water resources engineering, and geochemistry.