Sulfur Trapping at lowPPB levels using theSRI
8610CGasChromatograph
Sulfur analysis at the ppb level is
difficult because sulfur sticks to
many surfaces ( adsorption ). For
this reason onlyTeflon or other ex-
tremely inert tubing can be used.
SRI uses 1/16” Teflon tubing
with .030” id. This photo shows
how to cut Teflon tubing clean and
square. A razor blade can also be
used if you are careful to get a
square cut.
To connect the .53mm idMXT col-
umn to theValco valve, a 1” length
of Teflon tubing is cut and slid over
the end of the column. A regular
Valco nut and brass ferrule then
secures the column to the valve.
The trap is connected to theValco
valvewith longer lengths of Teflon
tubing. In this case, a 1” section of
column is inserted inside the end
of theTeflon tubing to act as a re-
inforcement or internal stiffener.
A regular Valco nut and brass fer-
rule secures theTeflon tubing in
the valve. The short piece of col-
umn keeps theTeflon from collaps-
ingwhen the ferrule is tightened.
Page2
The column fits
perfectly
inside .030id
Teflon tubing
