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Restek now offers a full line of secondary columns with a wide
range of polarities to help you accurately analyze highly complex
samples using GCxGC. These new columns can be matched with
any Restek Rxi® or Rtx® primary column to create the perfect
orthogonal separation for your application—and our online
column combination guide makes pairing simple. A 2 m length
means greater convenience and reduced cost while 0.15, 0.18,
and 0.25 mm ID formats accommodate varying sample capacities,
speeds, and detectors. And, of course, because they’re Restek col-
umns, you know you’re getting the high thermal stability and unri-
valed inertness you’ve come to rely on. Our chemists have been
performing comprehensive two-dimensional gas chromatography
since its commercial inception, and now you can put our years of
GCxGC experience to work in your lab, too.
Have You Tried Our
Reversible Inlet Seals?
Flip Seal™ inlet seals feature a patented
design that lets you simply flip them and
use them again instead of throwing them
away, so you get twice the life for
the same price. Soft Vespel ®
rings embedded in the
top and bottom surfaces
eliminate the need for a
washer and require very little
torque to make a reliable seal.
Choose gold plating or Siltek® treatment to reduce breakdown
and adsorption of active compounds for maximum transfer onto
the GC column. For decreased costs and increased performance,
you owe it to your data to try our reversible Flip Seal™ inlet seals
today.
1,4-Dioxane in Your Bathwater
Next time you take a bath, you
might just be enjoying a nice, long
soak in 1,4-dioxane. Dioxane is a
by-product of the ethoxylation
process, which is employed most
notably to create sodium myreth
sulfate and sodium laureth sul-
fate for the manufacture of soaps
and cosmetics. Unfortunately,
1,4-dioxane is also a possible human carcinogen and has also been
classified by the World Health Organization’s International Agency
for Research on Cancer (IARC) as a Group 2B compound. Global
concern has prompted companies to begin eliminating it from their
products and has also led to regulatory changes. For example, in the
U.S., the recently signed third Unregulated Contaminant Monitoring
Regulation (UCMR 3) will require monitoring using newly promulgated
methods. 1,4-dioxane will be analyzed according to U.S. EPA Method
522, which concentrates the sample using solid phase extraction (SPE)
instead of the most common technique previously used for this
compound: purge and trap. Restek offers dioxane reference standards
specifically formulated for Method 522, and you can find them at
Restek Introduces Secondary
Columns for GCxGC
Hot Topics
Chromatography in the News Product Spotlight
Questions FromYou
Our Technical Service specialists field an astounding variety of questions
from our customers. Today’s featured topic is the flowmeter.
Q: Why do I see a difference in readings from
different flowmeters?
A: All flowmeters present some level of flow impedance, but the
amount differs among meters. When any meter is connected to a
flow source, the system is loaded which will usually result in a change
of flow from the source. The amount of change in flow depends on
the level of impedance. While each meter will display the correct
current flow, they may have different readings because the actual
flow changes based on the degree of impedance. For this reason, it
is inappropriate to “check” the flow measurement of one volumetric
flowmeter against that of another.
We just released a full FAQ on the ProFLOW 6000 flowmeter! Find
answers to your questions at
- Brandon Tarr
Product Development Engineer
Wrestling with a question of your own?
Call 1-814-353-1300, ext. 4, or email
today!