Download ASTM Method D4815-94: Determination of MTBE, ETBE, TAME

ASTM Method D4815-94
ASTM Method D4815-94: Determination of MTBE, ETBE,
TAME, DIPE, tertiary-Amyl Alcohol and C1 to C4 Alcohols in
Gasoline
AC
(Analytical Control)
Oxygenate Analyzer
The AC Oxygenate Analyzer
consists of the Agilent 6890
Series GC configured with two
GC columns, a split/splitless
inlet, a ten-port sampling
valve, and a flame ionization
detector (FID). The complete
configuration is given in the
table at right.
The micropacked TCEP column
preseparates the low-boiling
non-polar components from
the polar and higher-boiling
nonpolar components. The
nonpolar capillary column then
separates the polar compo
nents, including the oxygen
ates, according to their boiling
points. Electronic pneumatics
control (EPC) is used for faster
backflush of the TCEP column.
This reduces the analysis time
by approximately 40%.
The Agilent ChemStation runs
in a Microsoft Windows
environment, controls the AC
Oxygenate Analyzer, and
automates all aspects of data
handling and data reporting.
Method Overview: This method determines individual ethers between 0.1 to 20
mass % and individual alcohols between 0.1 to 12 mass % when added to gasoline.
A switching valve is used with two columns.
Typical chromatogram of an ether gasoline blend
Backflush
FID
Response
DIPE
ETBE
MTBE
TAME
DME
2
4
6
8
AC Oxygenate Analyzer System Configuration
10
12
Hardware and Software
Agilent G1540A
Agilent 6890 Series GC
Option 112
Capillary split/splitless inlet with EPC control
Option 210
FID with EPC control
Option 301
Three channels of auxiliary EPC
Option 403
HP-IB communication cable
Agilent G1916A
Agilent 6890 Series automatic liquid sampler
Agilent G1875AA
Single-instrument GC ChemStation
Column Kit 19096B-050
Methyl silicone fused silica column (30 m x 530 µm id, 2.65 µm HP-1)
Micropacked TCEP precolumn (560 mm x 0.38 mm id, 20% TCEP on Chromosorb PAW 80/100)
Valves
Ten-port rotary valve
Instrument Control and Data Acquisition
Agilent ChemStation
28
14 min