Abstract
This chapter briefly discusses the sources, other than industrial point sources, responsible for the presence of organic chemicals in soil systems. In general, man-made sources of organic chemicals represent a minor contribution with respect to the total mass of organic chemicals in soil. However, chemicals deposited by man-made sources are frequently mistaken for chemicals discharged by onsite industrial or commercial operations. More industrially-derived organic chemicals will be identified as naturally-occurring as our knowledge of the reactivity of those naturally-occurring soil organic chemicals increases. The first source of organic chemicals present in soil is human activities which result in an “across-the-board” type of deposition into or onto soils. The second source of organic chemicals in soil is biota, which fall into two categories: vegetation, and soil fauna and soil flora. Unlike metals which do not change their chemical structure, these naturally-occurring organic chemicals are reactive and, as a result, are transient in soil systems.
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