Elsevier, 1991. — 372 p.
Pollution is said to exist when the concentration of a contaminant is large enough to interfere with the normal use of the environment and the wellbeing of biota, especially Man. In order to quantify the effects of these contaminants measurements of their concentrations have to be made. In some cases it is possible to make measurements directly within the environmental reservoirs themselves by deployment of appropriate probes, but more frequently a sample of that compartment will have to be isolated and adequately processed before a final measurement can be made. A knowledge of pollutant levels may help to trace the origin of contaminants and to follow their decay processes and effects in the environment. Sampling may also be necessary to ensure the enforcement and adequacy of control measures on emissions.