quantities of very pure gases to produce modern electronic components. Most products are optimized for the particular application. Peak gener- ally uses flame ionization and thermal conductivity detectors. However, I was impressed with the Reducing Compound Detector, which is specific for detection of hydrogen, carbon monoxide, and select hydrocarbons in high-purity gases including N2
, He, and Ar. When reducing compounds
interact with the mercuric oxide, metallic mercury, which is volatile, is generated. Mercury vapor is detected with UV absorbance. Detection limits are generally in the high-ppt range.
GC detectors
Master TOF Plus MS detector for GC/MS Displaying its customary touch of class, DANI Instruments S.p.A. (Milan, Italy;
www.danispa.it) introduced the Master TOF (time of flight) Plus MS detector for GC/MS. The detector acquires up to 30,000 spectra/sec. Usually these are combined and averaged to provide a reported output of 1000 spectra/sec saved to disk. This compression provides noise reduction even for the narrowest peaks, which are usually tens of milliseconds. Noise reduction also improves dynamic range, which is 105 remarkably small with a 22 × 53 cm footprint × 41 cm tall.
. The Master TOF is
The novel ion optics pulses the ions into the short flight tube. This provides detection sensitivity similar to the best of quadrupole mass analyzers op- erating in single-ion monitoring mode. Yet since you see all the spectra, you see unanticipated peaks.
In addition to the GC-TOF MS Plus, Dani offers autosamplers and software for operation and chromatogram evaluation. The latter is aided by rapid peak deconvolution subroutines.
Update on Catalytic Combustion Ionization Detector In the booth of DETector Engineering and Technology, Inc. (Walnut Creek, CA;
www.det-gc.com) Dr. Paul Patteson discussed improved per- formance of the unique Catalytic Combustion Ionization Detector (CCID), which selectively responds to n-paraffins, particularly in fuels. The key is the partial pressure of oxygen. At higher pO2
, the detector responds to
other isomers. At still higher oxygen content, the thermionic surface of the TID-10 will also respond selectively to oxygenates in fuels. These detectors fit on Agilent 6890 and 7890 (Agilent Technologies) and Thermo 1300 GCs (Thermo Fisher Scientific, Waltham, MA;
www.thermofisher.com).
New autosampler for GC EST Analytical (Fairfield, OH;
www.estanalytical.com) introduced the
FLEX rail format autosampler for gas chromatographs. This autosampler is capable of both sample preparation and sample introduction. For sample introduction it is compatible and can be mounted to any GC manufacturer’s system. The autosampler is capable of liquid injection in single or multi injectors. Options include: SPME Fiber conditioner with Tmax
of 350 °C, headspace option that holds heated syringes up to 2.5 mL,
and Water Rinse/Waste Station. The Incubate/Agitate box is capable of heating to 200 °C while agitating vials. Rack capacity is four racks each holding 105 vials (2.5 mL) or 32 headspace vials. In addition, the FLEX offers a simple and intuitive user interface that provides a unique drag and drop method developer, simplistic rail configuration setup, and easy
AMERICAN LABORATORY • 33 • MAY 2014
www.sartorius.com/picus
Revolutionize your pipetting Picus
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