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The chapters of this book were originally presented at the Fourth International Conference on the Biogeochemistry of Trace Elements, in June 1997 at Berkeley, California. The results of that symposium are now available to assist both specialists and those concerned with broader environmental issues. The first four chapters of Fate and Transport of Heavy Metals in the Vadose Zone are devoted to sorption-desorption processes. Subjects include the kinetics of trace metal sorption-desorption, adsorption of nickel and their isotherms, cadmium reactions, and retention mechanisms of both linear and nonlinear types. The next three sections describe complexation and speciation processes. The authors consider the effect of humic and fulvic acids, the binding of copper with organic matter, and the rate of dissolved selenium. Chapters eight through eleven scrutinize the bioavailability and retention of heavy metals and their mobility in the vadose zone. Twelve details plant-available concentration levels for heavy metals in the vadose zone. The last section relates case studies that are relevant to environmental affairs. Features
The end of the Cold War marked the beginning of a new era of facing the legacy of the arms race. The enormous challenge confronting us now is to strengthen the fragile nature of the new political balance. The beginning of this new historical period is characterized by mistrust, and the best way to ease these tensions is through international collaborations. Moreover, the intimate nature of close, non-invasive, collaborative work on environmental problems can help establish a secure foundation of mutual understanding and trust. Environmental projects are non-threatening to national security issues and may involve collaborations throughout the international weapons complex. Personal and individual scientific relationships quite often spearhead agreements at the government-to-government level. Environmental and nonproliferation issues are of great importance to the citizens of Russia, to the states of the Former Soviet Union, and to neighboring countries. The activities associated with decontamination and decommissioning of old facilities, environmental restoration, security enhancements, monitoring and surveillance, and risk reduction should provide a significant employment potential for scientists and engineers of the weapons complex of the Former Soviet Union.
The dramatic decrease in the incidence of stomach cancer in industrialized countries during the past 50 years, which is yet to be fully explained, and the observation that carcinogenesis in laboratory animals can be inhibited by antioxidants, retinoids, and caloric restriction, among other influences, challenge us to press on in the search for practical means to prevent cancer. It is in relation to this goal that the studies summarized in this book have special significance. This book is based on the invited and contributed papers presented at the Third Internationai Conference on Anticarcinogenesis and Radiation Protection, held on October 15-21, 1989, in Dubrovnik, Yugoslavia. They cover a broad range of investigations into the mechanisms and inhibition of carcinogenesis. In keeping with recent advances in our understanding of the importance of oncogenes and tumor-suppressor genes in carcinogenesis, many of the reports focus on mutations and related changes at the level of DNA. At the same time, however, other reports deal with nutritional, immunological, endocrinological, and epidemiological aspects. In all, the various reports address carcinogenesis and its inhibition at virtually every level of biological organization. Included in this compendium are timely reviews of diverse and promising research strategies for cancer prevention, as pursued by investigators in different parts of the world. The Organizers of the Conference are grateful to the many scientists who have contributed to the volume, as well as to the sponsors of the Conference, without whose generous support this book would not have been possible.
This volume of the Handbook is the second of a three-volume set of reviews devoted to the interrelationships, similarities, differences, and contrasts of the lanthanide and actinide series of elements. In particular this book considers the comparisons of the chemistry of the lanthanide and actinide elements.The lanthanide and actinide elements present a multitude of challenging physical and chemical problems resulting from the involvement of open F-shell electronic configurations. This is made clear in the chapters composing these volumes which cover topics such as: the experimental and theoretical aspects of solution absorption and luminescence spectra to reveal similarities and differences in the two f-series; the methods and effectiveness of separation by solvent extraction, ion exchange and necessary accompanying reactions; the comparative thermochemical and oxidation-reduction properties of lanthanide and actinide materials; interrelationships and comparisons of the halides; an examination of the relative hydration and hydrolysis behaviors of the lanthanides and actinides.