Environmental Chemistry is a relatively young science. Interestin this subject, however, is growing very rapidly and, although no agreement has been reached as yet about the exact content and Iimits 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 ofEnvironmental Chemistry must be the study ofthe 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 environ ment and chemical reactions occurring in the environment. The industrial activities of man have given a new dimension to Environ mental Chemistry. Wehave now synthesized and described over five million chemical compounds and chemical industry produces about hundred and fifty million tons of synthetic chemieals 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 ofup to 15 million inhabitants produce large quantities ofwaste 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 Iead to interference and disturbance of natural systems."

Report, the editors replaced the term "speciation" wherever it occurred by "identification and quantification," or "description of abundance," or "reactivity," or "transformation" of a chemical species, according to whichever one of the four meanings the author had evidently meant to convey. In line with the Dahlem Workshop Model, this Report comprises the background papers written in advance of the meeting on the current status of problems in environmental research and on advanced analytical tech niques for the identification and quantification of chemical species, as well as the group reports summarizing the results of the discussions held during the meeting. Each group report was prepared during the meeting by one "rapporteur" with the help of members of that group and finalized by the rapporteur (listed as the first author of the group report) after the meeting, taking into account both verbal comments made during the presentation of the reports in the plenary session at the end of the workshop and written comments received afterwards."

Metals in the hydrological cycle represent a very broad subject covering all parts of the geological cycle. The present version of this book, therefore, would not have been possible without the comments and suggestions for improvement on draft ver- sions of the various chapters by a large number of colleagues. We wish to express our gratitude to: P.A. Cawse (AERE, UK), J.N. Galloway (University of Virginia, USA) and S.E. Lindberg (Oak Ridge National Labo- ratory, USA) for reviewing the chapter on atmospheric trace metals. G. Batley (CSIRO, Australia) and B.T. Hart (Chisholm In- stitute of Technology, Australia) for reviewing the chapter on speciation of dissolved metals. E.K. Duursma (Delta Institute, The Netherlands), J.M. Bewers and P.H. Yeats (Bedford Institute of Oceanography, Canada) and D. Eisma (Netherlands Institute for Sea Re- search, the Netherlands) for reviewing the chapter on estuaries. P. Baccini (EAWAG, Switzerland) and W. Davison (Fresh- water Biological Association, UK) for reviewing the chapter on lakes. E.T. Degens (University of Hamburg, W-Germany) for re- viewing the chapter on the oceans, and J.P. Al (Public Works Department, The Netherlands) for reviewing most of the indi- vidual chapters. Without the collaboration of these colleagues this book would not have been possible in its present form.

Aquatic chemistry is becoming both a rewarding and substantial area of inquiry and is drawing many prominent scientists to its fold. Its literature has changed from a compilation of compositional tables to studies of the chemical reactions occurring within the aquatic environments. But more than this is the recognition that human society in part is determining the nature of aquatic systems. Since rivers deliver to the world ocean most of its dissolved and particulate components, the interactions of these two sets of waters determine the vitality of our coastal waters. This significant vol ume provides not only an introduction to the dynamics of aquatic chem istries but also identifies those materials that jeopardize the resources of both the marine and fluvial domains. Its very title provides its emphasis but clearly not its breadth in considering natural processes. The book will be of great value to those environmental scientists who are dedicated to keeping the resources of the hydrosphere renewable. As the size of the world population becomes larger in the near future and as the uses of materials and energy show parallel increases, the rivers and oceans must be considered as a resource to accept some of the wastes of society. The ability of these waters and the sediments below them to accommodate wastes must be assessed continually. The key questions relate to the capacities of aqueous systems to carry one or more pollutants."

Dieses Handbuch besteht aus insgesamt sieben Einzelb nden, die folgende Themen behandeln: Geofernerkundung, Geophysik, Str mungs- und Transportmodellierung, Geophysik, Geotechnik Hydrogeologie, Tonmineralogie und Bodenphysik, Geochemie sowie Handlungsempfehlungen. Als Grundlage diente den 37 beteiligten Forschungseinrichtungen und Firmen die Analyse von 28 Einzelvorhaben. Dabei wurden an ausgew hlten Teststandorten neue und bereits erprobte Verfahren gegen bergestellt, um so eine Auswahl der effektivsten und kosteng nstigsten Methodenkombinationen zu erhalten. Von der Bundesanstalt f r Geowissenschaften und Rohstoffe berufene Wissenschaftler stellten aus den hierbei gewonnenen Erkenntnissen das vorliegende Werk, unter entsprechender Ber cksichtigung der wissenschaftlichen Grundlagen und Hintergrundinformationen, zusammen.

Dieses Handbuch besteht aus insgesamt sieben Einzelbanden, die folgende Themen behandeln: Geofernerkundung, Geophysik, Stromungs- und Transportmodellierung, Geophysik, Geotechnik Hydrogeologie, Tonmineralogie und Bodenphysik, Geochemie sowie Handlungsempfehlungen. Als Grundlage diente den 37 beteiligten Forschungseinrichtungen und Firmen die Analyse von 28 Einzelvorhaben. Dabei wurden an ausgewahlten Teststandorten neue und bereits erprobte Verfahren gegenubergestellt, um so eine Auswahl der effektivsten und kostengunstigsten Methodenkombinationen zu erhalten. Von der Bundesanstalt fur Geowissenschaften und Rohstoffe berufene Wissenschaftler stellten aus den hierbei gewonnenen Erkenntnissen das vorliegende Werk, unter entsprechender Berucksichtigung der wissenschaftlichen Grundlagen und Hintergrundinformationen, zusammen."