US Geological Survey
The Reston Chlorofluorocarbon Laboratory
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CFC
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Dissolved Gas N
2
/Ar
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SF
6
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3
H/
3
He
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Low-Level VOCs
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Shipping+Submitting Samples
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SF
6
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Sampling Tips for SF
6
Accuracy and Precision of Analysis
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SF
6
instrument in use by the US Geological Survey