Teledyne 15-0800-074, Руководство пользователя

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Versa User Manual www.teledynetekmar.com
partition coefficient
K= C
M
/C
G
C
M
= K
*
C
G
C
G
= C
M
/K
K = Partition Coefficient
C
M
= Concentration in the Matrix
C
G
= Concentration in the gas phase or the headspace
NOTE: Lower K values result in higher concentrations in the gas phase.
patition coefficients of organics from
Water at 50
o
c
Compound K
Hexane 0.015
Benzene 2.5
Toluene 2.1
Xylene 1.3
Methanol 1670
Ethanol 1150
n-Propanol 770
Acetaldehyde 99
Acetone 190
Methylethyl Ketone 114
Since the equilibrium is a constant, Static Headspace analysis is a quantative technique. The concentration in the gas
phase is directly proportional to the original concentration in the matrix.
V
G
+ V
V
- V
M
V
G
= Volume of the gas phase
V
V
= Volume of the vial
V
M
= Volume of the Matrix
Introduction • Page 1-5