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not easily to be degraded. This term is used in classification of chemicals.

Penetration into water, air and soil of microorganisms, chemicals, toxic substances, wastes, or wastewater in concentration making them unacceptable for use.

a system of measures for protection against pests, weeds and illnesses of plants or prevention of their spreading by treating plants with chemicals. See Pesticides.

phenomenon in which the toxicity of a mixture of chemicals is greater than that one which would be expected from a simple summation of the toxicity of the separate chemic

– accumulation of a substance by an animal which preys on other animals that have themselves already accumulated such substance in its tissue. This process can bring to a