Reviews of Environmental Contamination and Toxicology provides detailed review articles concerned with aspects of chemical contaminants, including pesticides, in the total environment with toxicological considerations and consequences.

Reviews of Environmental Contamination and Toxicology attempts to provide concise, critical reviews of timely advances, philosophy and significant areas of accomplished or needed endeavor in the total field of xenobiotics, in any segment of the environment, as well as toxicological implications.

The subject of rainfall-runoff modeling involves a wide spectrum of topics. Fundamental to each topic is the problem of accurately computing runoff at a point given rainfall data at another point. The fact that there is currently no one universally accepted approach to computing runoff, given rainfall data, indicates that a purely deter ministic solution to the problem has not yet been found. The technology employed in the modern rainfall-runoff models has evolved substantially over the last two decades, with computer models becoming increasingly more complex in their detail of describing the hydrologic and hydraulic processes which occur in the catchment. But despite the advances in including this additional detail, the level of error in runoff estimates (given rainfall) does not seem to be significantly changed with increasing model complexity; in fact it is not uncommon for the model's level of accuracy to deteriorate with increasing complexity. In a latter section of this chapter, a literature review of the state-of-the-art in rainfall-runoff modeling is compiled which includes many of the concerns noted by rainfall-runoff modelers. The review indicates that there is still no deterministic solution to the rainfall-runoff modeling problem, and that the error in runoff estimates produced from rainfall-runoff models is of such magnitude that they should not be simply ignored."

This book is a collection of all the lectures by the professors attending the 3rd "Interna tional School on Marine Chemistry" held in Ustica (Palermo, Italy, September 2000), under the auspices of the United Nations and the Italian Chemical Society. The School was organized by the University of Palermo in co-operation with the Natural Marine Reserve of Ustica Island. The Organising Committee of the School wishes to thank the University of Messina, the University of Roma "La Sapienza: ' the Italian University Consortium of Environ mental Chemistry, and the Marine Reserve of Ustica Island for their financial support to the School. This book has been printed with the financial support of the Environmental Re search Centre CIRITA of the University of Palermo. thank all the professors whose outstanding scientific contributions have The editors made it possible to publish this book. Professor Antonio Gianguzza Professor Ezio Pelizzetti Professor Silvio Sammartano Contents Part I Biogeochemical Processes at the Air-Water and Water-Sediment Interface .............................................. ."

The growing perception of the public and politicians that life is extremely risky has led to a dramatic and increasing interest in risk analysis. The risks may be very diverse as demonstrated by the range of subjects covered at the annual meetings of the Society for Risk Analysis. There is a need to pause and see how well the present approaches are serving the nation. The theme, "Setting National Priorities," which was chosen for the 1987 SRA Annual Meeting, reflects the concern that in dealing with individual kinds of risks, society may be more concerned with the trees than the forest. It is surprising how little attention is being given to the holistic aspects of risk. Who, for instance, is responsible for a national strategy to manage the reduction of health or other risks? Individual agencies have the responsibility for specific patterns of exposure, but these are not integrated and balanced to determine how the nation as a whole can obtain the greatest benefit for the very large investment which is made in risk-related research and analysis.

Monitoring the environment is absolutely essential if we are to identify hazards to human health, to assess environmental cleanup efforts, and to prevent further degradation of the ecosystem. Biomonitors and biomarkers combined with chemical monitoring offer the only approach to making these assessments. Based on an International Association of Great Lakes Research conference, this book is intended for researchers who want to incorporate new and different technologies in their development of specifically-crafted monitors; students who are learning the field of biomonitoring; and regulatory agencies that want to consider newer technologies to replace inadequate and less powerful test regimes.

The difficulties associated with making risk assessments on the basis of experimental results are familiar to practitioners in many fields engineering, epidemiology, chemistry, etc. These difficulties are particularly common in problems that have dynamic and stochastic characteristics driven by multiple purposes and goals, with complex interconnections and inter dependencies. Acquiring an appropriate data base, processing and analyzing model results, and transmitting these results at an appropriate technical, social, political, and institutional level are additional difficulties that must be addressed. This book is grounded on the premise that risks are best assessed on the basis of experimental results and sound mathematical analyses, coupled with the knowledge of experts. The carcinogenicity prediction and battery selection (ePBS) approach described herein provides a systematic mechan ism-a synthesis of systems and statistical and decision analyses-to aid researchers and decision makers in the critical field of carcinogenicity prediction in selecting an appropriate battery of tests to use and in translating experimental results into information that can be used as an aid to decision making."

As we enter the nineties, there is worldwide awareness that the future of all mankind is inexorably linked by the world we share, and its response to man's activities. Lasers and the optical sciences have brought powerful tools to measure and understand our environment. LIDAR (laser radar) and laser fluorescence allow us to measure atmospheric and oceanic pollutants, as well as industrial emissions, from many kilometers distance. And a variety of sensitive laser-based spectroscopic techniques permit the accurate analysis of heavy metals and other trace elements in the environment. In September 1989, an international group of scientists me.t in Erice, Sicily, for the 14th Course of the International School of Quant~ Electronics. This Course was devoted to "Optoelectronics for Envi~onmental Science", and was ably directed by Prof. V. S. Letokhov of the USSR Institute of Spectroscopy and Prof. A. M. Scheggi of the C.N.R. Electro magnetic Waves Institute, Florence, Italy. This book gives the proceedings of that conference, which covered not only basic tutorial papers but also reports on the latest research results. The first half of this volume describes the techniques used for direct "In-Situ Measurements" of the environment. In "Techniques and Programs", four chapters and one extended abstract give tutorial discussions of the most important remote sensing techniques: LIDAR, laser fluorescence, and optical fiber sensors, plus a description of the Italian program in this area.

As society has become increasingly aware of the potential threats to human health due to exposures to toxic chemicals in the environment and the workplace and in consumer products, it has placed increased demands upon the still-fledgling science of toxicology. As is often the case when science is called upon to supply firm answers when pertinent information and fundamental knowledge are lack ing, both the scientific and the social issues become confused and new tensions develop. One of the major purposes of this book is to focus on those aspects of the science of toxicology that pertain most to social issues-namely, analysis of risk for purposes of human health protection. Although it is apparent that the discipline of toxicology is not yet prepared to provide firm answers to many questions concerning human risk, it is important that the rigorously derived information be used in the most objective and logical way to yield the closest approximation to the truth. This book is designed to sup ply as much guidance for such tasks as is permitted by the current state of our knowledge. Its emphasis is thus placed on interpretation of toxicity data (broadly defined) for assessing risks to human health. In this way, it differs from other basic toxicology texts, most of which emphasize methods for performing studies or describe various toxicological endpoints and classes of toxic agents."

Life is often considered to be a journey. The lifecycle of waste can similarly to be a journey from the cradle (when an item becomes be considered is placed in the dustbin) to the grave (when value valueless and, usually, is restored by creating usable material or energy; or the waste is transformed into emissions to water or air, or into inert material placed in a landfill). of this book This preface provides a route map for the journey the reader will undertake. Who? Who are the intended readers of this book? Waste managers (whether in public service or private companies) will find a holistic approach for improving the environmental quality and the of managing waste. The book contains general principles economic cost based on cutting edge experience being developed across Europe. Detailed data and a computer model will enable operations managers to develop data-based improvements to their systems. oj waste will be better able to understand how their actions can Producers influence the operation of environmentally improved waste management systems. oj products and packages will be better able to understand how Designers their design criteria can improve the compatibility of their product or package with developing, environmentally improved waste management systems. Waste data specialists (whether in laboratories, consultancies or environ mental managers of waste facilities) will see how the scope, quantity and quality of their data can be improved to help their colleagues design more effective waste management systems."

1 2 J. H. SCHROEDER and B. H. PURSER 1 Introduction A symposium convened during the Vth International Coral Reef Congress in Papeete, Tahiti, 1985, encouraged the editors to assemble this volume of case studies by participating and, especially, by nonparticipating scientists. An attempt was made to include case studies from various regions and geological periods, carried out on various scales from regional to ultrastructural. We hope to present an overall view of reef diagenesis. Although the volume focuses on reef diagenesis, fields also to be considered are biology, paleontology, and sedimentary facies distribution, as they provide the context and, to some extent, encompass the determinants of diagenetic processes. The scope has been limited to reef diagenesis because we feel that reefs have relatively clearly defined geometries, which facilitate the evaluation of diagenetic trends and the definition of diagenetic models. On the other hand, their many different components make reefs somewhat more complex than other deposits, and this creates difficulties in deciphering diagenetic histories; the study of reefs, therefore, is not the simplest manner of solving the many problems relating to carbonate diagenesis. An additional reason for evaluating reef diagenesis is the reservoir potential of these carbonate bodies. To illustrate the point, in the recent collection of 35 case studies of carbonate reservoirs (Roehl and Choquette 1985), reefs were involved in 15. The emphasis on porosity development in many studies of the present volume is therefore not of mere academic interest.

Biofilms -- Science and Technology covers the main topics of biofilm formation and activity, from basic science to applied aspects in engineering and medicine. The book presents a masterly discussion of microbial adhesion, the metabolism of microorganisms in biofilms, modelling of mass transfer and biological reaction within biofilms, as well as the behaviour of these microbial communities in industry (waste water treatment, heat exchanger biofouling, membranes, food processing) and in medicine (teeth, implants, prosthetic devices). Laboratory techniques and industrial monitoring methods are also presented. The book is directed at readers at the postgraduate level and is organised as a textbook, containing 11 chapters, a glossary, and a detailed subject index.

Waste incineration is the art of completely combusting waste, while maintaining or reducing emission levels below current emission standards. Where possible, objectives include the recovering of energy as well as the combustion residues. Successful waste incineration makes it possible to achieve a deep reduction in waste volume, obtain a compact and sterile residue, and eliminate a wide array of pollutants. This book places waste incineration within the wider context of waste management, and demonstrates that, in contrast to landfills and composting, waste incineration can eliminate objectionable and hazardous properties such as flammability and toxicity, result in a significant reduction in volume, and destroy gaseous and liquid waste streams leaving little or no residues beyond those linked to flue gas neutralization and treatment. Moreover, waste incineration sterilizes and destroys putrescible matter, and produces usable heat. Incineration Technologies first appeared as a peer-reviewed contribution to the Encyclopedia of Sustainability Science and Technology. It provides detailed treatment of the challenges of this technically complex process, which requires huge investment and operating costs, as well as good technical skills in maintenance and plant operation. Particular attention is paid to technologies for ensuring the complete burn-out of flue gas and residues and for controlling the resulting pollutants.

This book is the Proceedings of the International Conference on Trans portation, Storage, and Disposal of Hazardous Materials, which was held at the International Institute for Applied Systems Analysis (IIASA), 1-5 July 1985. The Conference brought together representatives of academia, business, and government from East and West to discuss the nature of current problems in the area of hazardous materials. An important objective of the Conference was to suggest steps that could be undertaken by industrial firms, the insurance industry, and govern ment agencies to improve the safety and efficiency with which hazar dous materials are produced and controlled in industrialized societies. Conference sponsors were IIASA, the Geneva Association, and the Center for Risk and Decision Processes of the University of Pennsyl vania. Additional financial support was received from the US Environ mental Protection Agency, the Monsanto Corporation, the Center for Organizational Innovation at the University of Pennsylvania, and the Canadian IIASA Committee. We are grateful to all of these institutions for their generous support of this Conference. Within IIASA, a long history of research in risk activities is evi dent. This owes much to the vision of IIASA's founding Director, Howard Raiffa, and program leaders who have promoted risk research at IIASA. The present Conference continued this tradition with the strong support of IIASA's current Director, Thomas H. Lee, and Deputy Director, Vitali Kaftanov."

In order to validate predictive models of the very long-term processes which affect the performance of radioactive waste repositories, there has been an increased interest in the information and understanding which can be obtained from studying similar mechanisms in natural systems. These "natural analogues," as they are known in the jargon of waste management, have been studied sporadically for many years, but there has been a considerable rejuvenation of interest in the last four years, possibly owing to the fact that performance assessment methodolo gy is gradually maturing to the point where it needs the kind of support which analogues can offer. Since 1982, the Commission of the European Communities has been involved in specific work on natural analogues in the framework of its activities on radioactive waste management, principally within the MIRAGE project which concerns migration of radionuclides in the geosphere. As a consequence, the Commission took the initiative, in 1985, of establish ing a Natural Analogue Working Group (NAWG) whose members can benefit from the overall expertise available for managing their own natural analogue research programmes. In this group, modeller' s requirements and the results of field research are exchanged at regular intervals. A number of wide-ranging investigation programmes, both on national and international scales. are currently underway or being initiated, and several of these have been discussed recently at the NAWG."

The elements in group 17 (VIlA) of the periodic table of elements-fluorine (F), chlorine (CI), bromine (Br), and iodine (I)-were designated by Berzelius as "halogens" (Greek hals, sea salt; gennao, I beget) because of their propensity to form salts. In this first of the two volumes of Bio chemistry of the Halogens, the biochemistry of the elemental halogens and inorganic halides is reviewed. Discovery, properties, and biochemistry of the elemental halogens are reviewed first (Chapter 1). This is followed by a review of the developments in the various areas of inorganic halide biochemistry (Chapters 2 through 5). The biochemistry of thyroid hor mones is considered in Chapter 6, while biohalogenation, an important link between inorganic and organic halogen biochemistry, is reviewed in Chapter 7. Chapter 8 covers the biochemistry of products produced by human-inspired halogenation, in particular, poly halogenated compounds that present environmental problems. In Chapter 9, the process is reversed and biodehalogenation is reviewed. In each subject, the attempt has been made to find an appropriate balance between depth and breadth of treatment, since a thorough, in depth review of this field would not be possible in a single volume. To provide readers not familiar with subjects with the necessary background to place subsequent discussions in perspective, brief historical develop ments of many of the topics are given."

Contained in this volume are the proceedings of the international conference on the "Genetic Toxicology of Complex Mixtures," held from July 4-7, 1989, in Washington, DC. This meeting was a satellite of the "Fifth International Conference on Environmental Mutagens" and the seventh in a biennial series of conferences on "Short-term Bioassays in the Analysis of Complex Environmental Mixtures. " Our central objective in calling together key researchers from around the world was to extend our knowledge of the application of the methods of genetic toxicology and analytical chemistry in the evaluation of chemical mixtures as they exist in the environment. This conference emphasized the study of genotoxicants in air and water, and the assessment of human exposure and cancer risk. The latest strategies and methodologies for biomonitoring of genotoxicants (including transformation products) were described in the context of the ambient environment. Source character ization and source apportionment were discussed as an aid to understand ing the origin and relative contribution of various kinds of complex mix tures to the ambient environment. Similarly, investigations of genotoxi cants found in the indoor environment (sidestream cigarette smoke) and in drinking water (chlorohydroxyfuranones) were given special attention in terms of their potential health impacts. New molecular techniques were described to enable more precise quantitation of internal dose and dose to-target tissues. The emphasis of presentations on exposures/effects assessment was on integrated quantitative evaluation of human exposure and potential health effects.

Bioremediation is a rapidly advancing field and the technology has been applied successfully to remediate many contaminated sites. The goal of every soil remediation method is to enhance the degradation, transformation, or detoxification of pollutants and to protect, maintain and sustain environmental quality.

Advances in our understanding of the ecology of microbial communities capable of breaking down various pollutants and the molecular and biochemical mechanisms by which biodegradation occurs have helped us in developing practical soil bioremediation strategies. Chapters dealing with the application of biological methods to soil remediation are contributed from experts authorities in the area of environmental science including microbiology and molecular biology from academic institutions and industry."

The use of biotechnical processes in control of environmental pollution and in haz ardous waste treatment is viewed as an advantageous alternative or adduct to phys ical chemical treatment technologies. Yet, the development and implementation of both conventional and advanced biotechnologies in predictable and efficacious field applications suffer from numerous technical, regulatory, and societal uncertainties. With the application of modern molecular biology and genetic engineering, there is clear potential for biotechnical developments that will lead to breakthroughs in controlled and optimized hazardous waste treatment for in situ and unit process use. There is, however, great concern that the development of these technologies may be needlessly hindered in their applications and that the fundamental research base may not be able to sustain continued technology development. Some of these issues have been discussed in a fragmented fashion within the research and development community. A basic research agenda has been established to promote a sustainable cross-disciplinary technology base. This agenda includes developing new and improved strains for biodegradation, improving bioanalytical methods to measure strain and biodegradation performance, and providing an in tegrated environmental and reactor systems analysis approach for process control and optimization."

The complex topic of in-situ subsurface remediation technologies has been ad dressed at an international symposium at the Universitat Stuttgart on September 26 and 27, 1995, on the occasion of the inauguration of the research facility VEGAS (Versuchseinrichtung zur Grundwasser- und Altlastensanierung). The results are contained in this book with 22 contributions from leading experts in the field from Europe and North America. The book illustrates the role of large-scale experiments in groundwater and subsurface remediation research. The subtopics address the various links between conventional laboratory experiments, technology-scale experiments and field-site studies, showing the contribution of large-scale experiments to bridging the gap between small-scale investigations and large-scale field investigations (upscaling). The interdisciplinary nature of the problems requires a multidisciplinary approach. Therefore, the idea has been followed to bring together the various disciplines in volved in the different aspects and facets of subsurface flow, transport and trans as hydraulics and hydrology, physics, formation, involving such diverse disciplines chemistry, microbiology, geology, industrial, chemical and hydraulic engineering, mathematics and hydroinformatics. The individual contributions from these di versified fields address the subject from different angles in an attempt to form a coherent picture of the various aspects of the complex problems of subsurface remediation. The focus is on research approaches and strategies with respect to the development of new and improved technologies and to the role of large-scale experiments in research and application.

The interest in air pollution modelling has shown substantial growth over the last five years. This was particularly evident by the increasing number of participants attending the NATO/CCMS International Technical Meetings on Air Pollution modelling and its Application. At the last meeting 118 papers and posters were selected from an abundance of submitted abstracts divided over five modelling topics: (i) model assessment and verification, including policy applications, (ii) air pollution modelling in coastal areas with emphasis on the mediterranean region, (iii) accidental atmospheric releases, including warning systems and regulations, (iv) modelling of global and long-range transport and (v) new developments in turbulent diffusion. A round-table discussion chaired by John Irwin (USA) and Jan Kretzschmar (Belgium) on the harmonization of air pollution models was attended by more than 50 scientists and is reported in these proceedings. The opening paper addressed the main issue of this conference: modelling over complex terrain. Of particular interest were coastal areas where the surface inhomogeneities introduce small-scale circulation and varying atmospheric stability, often combined with a complex topography. As the conference was located on the beautiful island of Crete, problems faced by the host nation, particularly Athens and its environs were obvious examples for consideration. These together with other regions with similar geographical features were addressed. Heavily populated and industrialized as they often are, air quality is generally poor there and emission regulations are desired. Obviously, a major task of air pollution dispersion modelling is to assist policy makers in formulating sensible regulations.

Solid waste is one of the newest fields to achieve recognition as a sub-discipline in environmental engineering. As such, one is hard-pressed to find thorough coverage of related topics in academic curricula. Many graduate programs in environmental engineering have one introductory course in waste control. A handful of texts, some excellent, exist to serve this need. Recent purported crises in solid waste management have forced the understanding that something beyond the traditional control methods may be appropriate. Resource recovery is the correct nomenclature for the longest standing alternative approach seeking to extract materials from the waste stream for eventual re-use in one or another beneficial fashion. Several books have evolved, covering various approaches. Design approaches therein have borrowed heavily from other disciplines, ceasing where solid waste differs from the feeds to be processed. These books were oriented towards knowledgeable practitioners. This work attempts to present waste processing as a study in unit operations appropriate to university study at the graduate level. The study of unit operations is typical in environmental engineering. These unit operations are different. A variety of student backgrounds are suitable. However, a familiarity with the basics of waste control, such as would be gained from one of the introductory courses mentioned above, is assumed, as is a sound quantitative background. It is hoped that this work fills an empty niche. Contents 1 Waste as a Resource . . . . . . . . . . . . . . . . . . .. . . 1 . . . . ."

This book provides a basis by which instruments and transducers can be selected, assembled and integrated with a computer to measure and control physical processes in an accurate and predictable manner. It consists of two parts, the first of which lays the theoretical foundation for the second. First the Fourier analysis of signals are summarized. Then, from a systems point of view, the following chapters introduce the important aspects of filters, amplifiers and analog-to-digital converters. The second half of the book first discusses in depth the importance of the timing of the computer with its instruments, transducers and actuators. It then summarizes the physical and functional aspects of transducers and actuators and gives numerous detailed examples of how they can be integrated into computer controlled experiments and processes.

An Introduction to Environmental Biotechnology provides an introduction to the subject of environmental biotechnology. Environmental biotechnology refers to the use of micro-organisms and other living systems to solve current environmental problems such as the detoxification of pollutants and clean-up of oil tanker spills. Additionally, it refers to the biotechnology of the agricultural environment, as well as the use of biopesticides and the application of microorganisms to the mining, metal recovery and paper industries. This is the only comprehensive introductory account of this subject matter. Beginning with an introduction to microbial growth, An Introduction to Environmental Biotechnology aims to provide the non-specialist with a complete overview of environmental biotechnology. It is presented in an easy to read style with illustrations and includes frequent references to the use of higher plants as well as micro-organisms in environmental biotechnology. An Introduction to Environmental Biotechnology is geared toward a non-specialist audience, including engineers and environmental chemists, and environmental scientists who have limited knowledge of microbiology and biotechnology.

Contributors from twenty-two nations address various projects in their native countries to either develop, demonstrate, or facilitate the adoption of cleaner technologies and cleaner products. Reviewing the environmental situation in their respective countries and discussing the development and adoption of pollution prevention technologies, the authors provide thought-provoking and incisive treatments of the subject. An extremely comprehensive index enables the reader to retrieve focus on the information of interest quickly and efficiently.