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CFCs (Chlorofluorocarbons) are sensitive tools in the study of groundwater mixing. Based on results of CFC concentrations, the extent of mixing can be identified by three methods: 1. discrepancy between apparent ages determined by individual CFC compounds; 2. inconsistency between CFC concentration ratios and their respective apparent ages; and 3. correlation between the concentrations of two CFC compounds for a group of samples. The principle of determination of mixing ratios and apparent CFC water age in the case of a two component mixing of CFC-containing water with CFC-free water is described.
Based on on results of CFC concentrations, the extent of mixing can be identified by three methods: 1. discrepancy between apparent ages determined by individual CFC compounds; 2. inconsistency between CFC concentrations ratios and their respective apparent ages; and 3. correlation between the concentrations of two CFC compounds for a group of samples. The principle of determination of mixing mixing and apparent CFC water age in the case of a two component mixing of CFC-containing water with CFC-free water is described.