Entech's Contributions to the
Science of Chemical Sampling and Analysis:
1990
First whole air multi-position VOC inlet
1992
First 3-stage preconcentrator for polar/non-polar VOC analysis
1993
Turnkey solutions for air analysis
1994
SmartLab 1 systems introduced
1998
Silonite coated minican introduced
1999
Large Volume Static Headspace
2002
New products for semi-volatile sampling and analysis (flavors,
fragrances, chemical weapons, mVOC's)
Silonite coated GC injection liners and fittings
USB based SmartLab 2™ introduced
2003
First Robotic Autosampler for canisters and Large Volume
Headspace
Direct on-column large volume GC injector for gas phase samples
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Solutions for Analyzing Volatiles
in Solids, Liquid and Gases
Volatile chemicals can be analyzed using a variety of techniques
from qualitative, non-specific detectors to very reliable
and quantitative GC and GCMS methods. In many cases, remote
sample collection and laboratory analysis have several advantages
over on-site analysis. Simple, rugged samplers allow the collection
of gas, liquid or solid samples without the need for power,
field calibration or highly experienced technicians. Collecting
the sample without modification in the field eliminates the
chance of losing important analytes, as can occur with adsorption
tubes. Samples can be collected from several locations and
then analyzed on the same laboratory instrument. The result
is lower overall costs and elimination of inter-instrument
bias.
Entech has been perfecting the art and science of quantifying
levels of volatile chemicals in gas phase matrices from %
levels to well below 1 PPB. A new surface coating called SiloniteTM
allows stainless steel sampling containers, transfer lines
and connective fittings and valves to be rendered as inert
as fused silica, greatly extending the range of compounds
that can be collected in the field. With Silonite coated canisters,
compounds can be analyzed up to several weeks later with very
little change in gas phase concentrations. Turn key solutions
are available for field sampling into vacuum tight Silonite
coated canisters, laboratory analysis using multi-position
autosamplers and cleanup systems that allow the coated canisters
to be re-used hundreds of times.
The introduction of Large Volume Static Headspace (LVSH)
in 1999 has created a powerful new tool for analyzing volatiles
in the headspace above solid and liquid samples. The static
nature of the analysis eliminates the aerosols and foaming
associated with dynamic headspace analysis, while lowering
detection limits 100-500 times below conventional loop-injection
headspace inlets. Combined with the inertness of Silonite
coating and Entech's 14 years of experience in preconcen-tration
technology, LVSH is allowing a more complete analysis of foods,
flavors, odors and out-gassing contaminants than ever before. |
