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gas chromatographs, the obvious

advantages of portable instruments for

on-site monitoring, environmental testing,

forensic and security applications turns

their singlemindedness into a strong

attractor. At the same time, laboratory gas

chromatographs continue to become more

like commodity items than the research

workhorses they were in the past, so much

so that one new gas chromatograph this

year featured “a choice of five colours to

brighten your lab.”

On the comprehensive two-dimensional

(2D) GC front, two companies showed

instruments that feature a single flame

ionization detector with sophisticated data-

reduction and interpretation software for

presenting the complex and information rich

2D data stream. The technique remains a

research tool, however, and has not yet made

significant advances into routine GC analysis.

In a Sunday afternoon “New

Instrumentation” session, SLS Micro

Technology GmbH (Hamburg, Germany)

introduced what is arguably the world’s

smallest commercially available GC module.

At 3  2  1 in., the GCM-5000 GC

module includes an inlet, a temperature-

programmable column, a detector, gas-

flow control and electronics. The company

currently offers the module for evaluation

and is looking for OEM vendors.

Varian introduced its model 4000 Ion

Trap GC–MS system, which features three

ionization source configurations: internal,

external and hybrid. Varian also showed a

new version of its model CP-4900 portable

gas chromatograph, with a differential ion

mobility detector that provides greatly

increased sensitivities compared with the

available thermal conductivity detector, as

well as tunable ion selectivity. The device is

factory-tuned for applications in the

petrochemical, natural gas, environmental

and life science areas.

From Thermo Electron (Waltham,

Massachusetts, USA), the new Finnigan

Focus DSQ GC system is a small-footprint

version of the company’s dual-stage

quadrupole mass spectrometer in

combination with the single-column Focus

GC system. The instrument package is

targeted for routine low-cost operations.

Also in the low-cost arena, the 200-Series

GC system from EST Analytical (Cincinnati,

Ohio, USA) is a small single-column routine

laboratory instrument with an autosampler.

In the MS instrument category, the

model QP-2010 MS system from Shimadzu

Scientific Instruments Inc. (Columbia,

Maryland, USA) offers a variety of ion

sources, dual differential pumping and a

direct inlet probe. The Headspace

ChemSensor system from Gerstel Inc.

(Baltimore, Maryland, USA) combines a

…laboratory gas chromatographs continue to become

more like commodity items than the research workhorses

they were in the past…

Product Company Comments

200 Series GC EST Analytical This is a compact, full-function capillary or metal-packed column GC system that features

and Autosampler multilevel temperature programming, single-flame ionization or thermal conductivity detector,

split–splitless inlet system and single keypad control. A companion 23-position autosampler is

available. This unit won the UK DTI Technology Award for design.

4000 Ion Trap GC–MS Varian This ion trap MS system is configurable with three separate ionization configurations: internal,

external and hybrid. The internal ionization configuration provides conventional ion trap electron

ionization and positive chemical ionization. The external ionization option uses pulsed ionization,

which reduces contamination and maintenance requirements, and adds negative chemical

ionization capability as well as MS–MS detection mode. The hybrid chemical ionization mode

enables the selection of a specific reagent ion for reaction with sample molecules. The detector

has a mass range of 10–1000 Daltons, a pumping speed of 230 L/s, and works with the

company's CP3800 gas chromatograph.

CP-4900 with DMD Varian The CP-4900 Micro-GC with Differential Mobility Detector (DMD) is designed for trace-level,

multicomponent analysis of gaseous samples. It has sensitivities in the 100 ppb range (e.g., for

acrylates in natural gas), a dynamic range of 10

and is largely independent of matrix effects. The

DMD is factory tuned according to specific application requirements, and it runs in series with a

µ-TCD. The µ-DMD uses nitrogen or zero-grade air as the transport gas at a typical flow-rate of

400 mL/min and a

Ni ionization source. The instrument is intended for use in petrochemical,

natural gas, environmental and life science applications. The dedicated analyser can be controlled

from the company's Galaxie, Star Workstation or CP-Maitre Elite workstation.

Finnigan Focus DSQ Thermo The Focus Dual-Stage Quadrupole (DSQ) GC–MS system consists of a small-footprint EI-only

Electron quadrupole mass spectrometer with the company's curved prequad optics from the Trace DSQ

mass spectrometer and a single-column Focus GC system. The Trace DSQ features a mass range

of 1–1050 amu, a maximum scanning rate of 10 000 amu/s and turbomolecular pump capacities

of 70 or 250 L/s.

GCM 5000 Gas SLS Micro A micro-sized GC that fits into a 3  2 in footprint, the GCM 5000 incorporates a 1 m  60 µm

Chromatography Technology bonded-phase capillary column on a temperature-programmed micromachined chip less than

Module GmbH 1 in. square. Combined with a micromachined thermal conductivity detector, a valved inlet and

microprocessor control, the system delivers fast chromatography down to 7 ppm of propane in

helium in a package that’s the size of a PDA. The device is temperature-programmable to

200 °C in 30 s and cools down in almost the same time. The column flow-rate is around

100 µL/min. The detector, which fits on a standard dual in-line package microchip, is made from

silicon and thin-film platinum elements, has a response time of 250 µs, and a 10 nL volume. The

inlet is made from micromechanical components and injects volumes ranging from 30 to 300 nL.

The onboard data system can store 2 MB of data for uploading via an RS-232 interface.

Table 1: GC instrument systems.

1 2 3 4 5 6 7

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