Chapter 1. Trace-Element Contaminants. General considerations. Lead. Cadmium. Mercury. 2. Factors Affecting the Trace-Element Composition of Soils. Introduction. Effect of parent material. Effects of lime and fertilizers. Depletion from cropping. Sulfur. Assessing availability. Urban and rural soils. 3. Trace-Element Contamination of the Atmosphere. General considerations. Lead from petrol. Mercury. Fluorine. 4. Sources of Trace-Element Contamination of Soils. Introduction. Miscellaneous sources of contamination. Dumped wastes. Waste materials deliberately added to the soil. Pesticides. 5. Availability of Trace-Elements in the Soil. Introduction. Relationship between plant uptake and "available" level in soil. 6. Consequences of Trace-Element Contamination of Soils. General considerations. Composition of herbage in urban areas. Composition of cabbages in urban areas. Effects of application of sewage sludge to soil on plant composition. Effects of applications of municipal compost on plant composition. Effects on crops and animals. Conclusions. 7. Trace-Element Contamination of the Hydrosphere. Introduction. Pollution potential of trace elements. Problems of inadequate dispersal. Conclusions. 8. Prevention of Dispersion of Metals in the Environment. Introduction. Need to recycle metals. Disposal of municipal refuse. Municipal waste waters and sewage sludge. Measures required to minimize dispersal of metals. References. Author Index. Subject Index.