US Geological Survey
The Reston Groundwater Dating Laboratory
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CFC
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Dissolved Gases N
2
Ar CO
2
CH
4
O
2
Background
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Sampling
SF
6
Background
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Sampling
3
H/
3
He Noble Gases
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Low-Level VOCs
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Chromatogram
Chromatogram for N
2
/ Ar Dissolved Gases. This output is from the TCD. Note two elutions for N2
from the inner and outer columns