What is the relation between VOC production and VOC occurrence?
Production of volatile organic compounds (VOCs) alone does not fully explain VOC occurrence. For example, if production rates of VOCs alone were the primary governing factor explaining detection frequencies, the gasoline hydrocarbons would be detected in aquifers much more frequently than the other six VOC groups, which is not the case. Possible reasons for the lack of correspondence between VOC production rates and detection frequency in aquifers include: (1) production data are not available for all VOCs in each group so actual production may be considerably higher than available estimates; (2) production is not necessarily an exact measure of a VOC source that is contributing a VOC to ground water; and (3) other factors such as the hydrogeologic setting, geochemistry of the ground water, and the transport and fate properties of VOCs, can control the occurrence of VOCs in aquifers.
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