Table 5101 Coolant Solutions For Freezeout Sampling

Coolant Temperature (°C)

Ice water 0

Dry ice and isopropyl alcohol -78.5

Liquid air -147

Liquid oxygen -183

Liquid nitrogen -196

are not used for routine sampling purposes unless no other approach is feasible.

However, freeze-out sampling is an excellent means of collecting substances for research studies inasmuch as the low temperatures tend to arrest further chemical changes and ensure that the material being analyzed remains in the sampling container ready for analysis after warming. Analysis is usually conducted by GC, IR, or UV spec-trophotometry or by mass spectrometry.

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