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Iron and manganese are installed as state variables in a previously developed benthic sediment model. Initial emphasis is placed on manganese because of availability of observations. Mass-balance and chemical equilibrium equations for manganese in benthic sediments are presented. The model is tested in steady-state and time-variable mode against observations collected in Long Island Sound and Narragansett Bay. The initial model captures seasonal trends in sediment manganese release, although the magnitude of seasonal variability is underestimated. Improvement of the model through representation of manganese carbonate solubility is recommended. Iron, Model, Manganese, Sediments.
This volume presents papers on the use of micro-XRF core scanners in palaeoenvironmental research. It contains a broad ranging view of instrument capability and points to future developments that will help contribute to higher precision elemental data and faster core analysis. Readers will find a diverse range of research by leading experts that have used micro-XRF core scanners in a wide range of scientific applications. The book includes specific application papers reporting on the use of XRF core scanners in a variety of marine, lacustrine, and pollution studies. In addition, coverage also examines practical aspects of core scanner usage, data optimisation and data calibration and interpretation. In a little over a decade, micro-XRF sediment core scanners have made a substantive contribution to palaeoenvironmental research. Their impact is based on their ability to rapidly, non-destructively and automatically scan sediment cores. Not only do they rapidly provide important proxy data without damaging samples, but they can obtain environmental data at decadal, annual and even sub-annual scales. This volume will help both experienced and new users of these non-destructive core scanners take full advantage of one of the most powerful geochemical screening tools in the environmental scientist's toolbox.
Presents an examination of the scale of water pollution problems, and, through case studies, explores the type of investigations biologists need to undertake in solving them. The text draws comparisons between British and European practice,
Taking over 10 years to develop, the new EU Water Framework Directive is the most significant legal instrument in the water field to emerge from Brussels for some time and will have a profound effect on how water is managed in Europe over the next 25 years. The book outlines its basic features. It explains how the current approach to water management will have to change in order that European Member states and those countries currently in accession negotiations can meet the requirements of the directive, describing a number of examples of current practices as possible systems which could be used in the new approach. The concept of river basin management is outlined, and the potential institutional problems associated with implementing such a system are discussed including the problems associated with cross-border river basins, a common situation in Europe. Examples of existing river basin authorities and international collaboration are given as possible models. The directive requires the establishment of programmes of measures to improve water status. Some countries already use such a concept, and examples are quoted. As a result of its implementation, the directive aims to achieve good water status in all natural surface waters and groundwater in 15 years. For surface waters, the definition of 'good' is based on a new concept of 'ecological quality' taking into account biology, chemistry and their physical features. For groundwater, it includes quantitative status. The approach taken is an integrated one which has to consider all the naturally occurring and human factors which affect the waters. The difficulties of interpretation of the new concept of 'ecological water status' are discussed and some of the examples of current biological and chemical classification schemes that are used in Europe are examined. The directive also alters the way in which pollution is to be controlled - the 'combined' approach. This concept is explained. The EU Water Framework Directive: An Introduction is an invaluable source of guidance on the implementation of the Water Framework Directive for all those concerned with water management including water quality planners and scientists, pollution control and environmental staff in the water and wastewater industries and environmental regulators who all have to adapt to the new approach to their work. Contents Introduction The EU Water Framework Directive Principal Obligations of the Directive Implementation of the Directive River Basin Districts River Basin Characteristics Environmental Objectives Programme of Measures River Basin Plans Groundwater Waters Requiring Special Protection Priority Substances Monitoring Economic Instruments Recording and Reporting Summary Timescales and Future Developments
This volume features papers presented at the International Symposium on the Eutrophication Process and Control in Large Shallow Lakes-–with Special Reference to Lake Taihu, held in Nanjing, China in April 2005. Coverage includes: physical processes and their effects on shallow lake ecosystems; biogeochemistry of sediments and nutrient cycling in shallow lakes; and algal blooms and ecosystem response in shallow lakes.
Metal Metabolism in Aquatic Environments is a synthesis of recent developments in the field of metal ecotoxicology and features a number of contemporary issues arising from the interaction of metals and biota, such as pathways of assimilation and food chain transfer, metal accumulation and detoxification in humans and biotransformation of elements such as mercury and arsenic.
The aim of this volume is to draw together state-of-the-art reviews of knowledge onlevels of heavy metals in marine environments (particularly in marine animals), the dynamicprocesses in these systems, toxic effects, and threats presented by heavy metals in foods ofmarine origin.All heavy metals, whether biologically essential or not, have the potential to be toxicto organisms at a threshold bioavailability. Such threshold concentrations vary betweenmetals, between species and with the physicochemical characteristics of the medium, somelike copper being particularly toxic even though essential in trace amounts. Responses ofanimals to metals in their medium or food depend to a large extent on the ability of speciesto regulate levels attained in their tissues. Higher animals have the capacity to regulate levelsof many metals, while marine invertebrates can regulate some within certain limits. Whereanimals cannot regulate physiological levels of metals, an alternative strategy is to detoxifyand store metals in relatively harmless forms. Knowledge of the manner in which animals deal with potentially toxic concentrations of heavy metals is of fundamental importance in the assessment of metal pollution by analysis of metal levels in biological samples. The interaction of heavy metals with biological materials is a key theme running through this volume. Toxic effects may be reflected at the individual, population, or ecosystem level, affecting species composition and production levels, or may be of direct dietary significance to man. The global cycling of metals through the marine environment is crucially affected by biological processes.