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Typical Impurities in Pure Gas Grades That Can Affect Detectors

DETECTOR

IMPURITIES and their AFFECTS
Discharge Ionization Detector
DID
Atmospheric contaminants in the helium carrier gas can cause baseline noise and reduced detector senstivity.
Electron Capture Detector
ECD
Oxygen and water can reduce detector response and halocarbons can give rise to baseline noise and negative peaks.
Flame Ionization Detector
FID
Hydrocarbons in carrier and fuel gases can cause baseline noise and reduced detector sensitivity. Oxygen and water can cause column deterioration.
Flame Photometric Detector
FPD
Carbon dioxide can suppress detector response and organics can yield baseline noise.
Fourier Transform Infrared
FTIR
Any impurity coinciding with quantitated peaks can cause analytical inaccuracies. Water interferes with infrared spectra and oxygen can oxidize the sample during Matrix isolation.
Hall® Detector
(Electrolytic Conductivity Detector)
ELCD
To minimize baseline noise and analytical inaccuracies, Hall Grade gases are specifically manufactured for use with the Tracor Hall® Electrolytic Conductivity Detector.
Halogen Specific Detector
XSD
Detector performance is affected by several factors including source of oxygen and gas flow rate.
Helium Ionization Detector
HID
Atmospheric contaminants in the helium carrier gas can cause baseline noise, signal polarity and reduced detector sensitivity and stability.
Mass Spectrometer
MS
Any impurity coinciding with quantitated peaks can cause analytical inaccuracies.
Photo Ionization Detector
PID
Oxygen can cause suppressed detector response and hydrocarbons yield baseline noise.
Pulsed Discharge Electron Capture Detector
PDECD
An array of TechniMate® gas mixtures offered by Scott allows for fine tuning the sensitivity of the detector to the analyte response characteristics.
Pulsed Discharge Helium Ionization Detector
PDHID
An array of TechniMate® gas mixtures offered by Scott allows for fine tuning the sensitivity of the detector to the analyte response characteristics.
Pulsed Discharge Photo Ionization Detector
PDPID
An array of TechniMate® gas mixtures offered by Scott allows for fine tuning the sensitivity of the detector to the analyte response characteristics.
Pulsed Flame Photometric Detector
PFPD
Atmospheric contaminants (especially oxygen) and hydrocarbon interfere with the selectivity and sensitivity of the instrument.
Thermal Conductivity Detector
TCD
Atmospheric contaminants can oxidize the detector filament and give rise to reduced sensitivity and negative peaks.
Thermionic Specific Detector
TSD
Hydrocarbon and other contaminants can prevent the elution of trace components by absorbing into ceramic components of the detector.
Ultrasonic Detector
USD
Atmospheric contaminants in the carrier gas may cause baseline noise and loss of sensitivity.




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