Fundamentals of Sample Preparation for Environmental Analysis - Fundamentals of Environmental Sampling and Analysis - page 186

Cooling
water
out

Condenser

50 cm

Condenser

Distillate
chamber
vol.
-2.0 cc

Distillate
chamber
vol.
-2.0 cc

28 mm OD

Cooling
water inlet

6 mm
Septum
port

43 mm OD

20 mm OD

C ooling
water
inlet

20 cm

Vigreux
column

Distillation
pot

2000 cm 3

Heating
mantle

Figure 7.15 An azotropic solvent distiller for volatile and non-purgeable compounds
(U.S. EPA, 1996)

or less, which results in the condensation of water vapor. The uncondensed distillate
is cryogenically trapped on a section of 1/8 inch stainless steel tubing chilled to the
temperature of liquid nitrogen (196 C). After an appropriate distillation period,
the condensate contained in the cryotrap is thermally desorbed and transferred to the
gas chromatography using helium gas.

7.6.4 Volatile Organic Sampling Train

The volatile organic sampling train (VOST) is used to collect volatile principal
organic hazardous constituents (POHCs, boiling point less than 100 C) from the gas