By International Atomic Energy Agency
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2001). Although included in the age analysis, by accounting for the small excesses, the adjusted ages were typically less than one year older than those based on average North American air and were within the uncertainties of the dating methods. , 1990), contact with air during sampling, introduction of young (and/or contaminated) water induced by pumping, and introduction of CFCs during well construction. In some cases, the sample tubing is a source of CFC contamination. A series of tests were conducted in the early 1990s to determine the contamination potential of various tubing materials.
2000). CFC-12 and CFC-113 concentrations in 32 EFFECTS AND PROCESSES THAT CAN MODIFY APPARENT CFC AGE unsaturated zone air in south-central Idaho were near or below North American air mixing ratios. , 2000). Most of the surface water samples were from canals that carry water from the Snake River, in south-central Idaho, which is diverted for crop irrigation, and these waters were near solubility equilibrium with CFC-12 and CFC-113. However, CFC-11 concentrations were up to twelvefold saturation in some of the surface waters, therefore, local recharge of contaminated river water used for crop irrigation is also a likely source of CFC-11 contamination in southcentral Idaho.
That case could be especially interesting in mountainous regions to derive recharge altitudes via the temperature dependency. 4. g. Herzberg and Mazor, 1979; Heaton and Vogel, 1981). The excess concentrations of various gases are often in accordance with air composition and this effect is, therefore, 47 COOK et al. called excess air (Heaton and Vogel, 1981). This is probably a result of a transient rise in the water table that does not fully displace the gas phase, or can be artificially introduced during well construction, development or purging.