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From PID Analyzers
Last year, we (1) presented a method for the analysis of BTX at low ppb levels in beverage
grade CO2. In this paper, we describe a method for volatile oxgenates and demonstrate that it
can be combined with the previous BTX (1) method to perform multifunctional analyte
analyses. The photoionization detector (PID) has been improved to provide the sensitivity and
ppb detection limits required by the industry. The 301-B now has multiple valve switching
capability and multiple autozeros to smooth the baseline when columns are switched in or out.
With these changes and system optimizations, we have achieved some complex separations at
ppb levels with a minimum of operator time or training required.
?? The following method on the 301-B was developed for the analysis of ppb levels of oxygenates
(acetaldehyde, methanol & dimethyl ether) in beverage grade carbon dioxide. The detection
limits required were 100 ppb for acetaldehyde and dimethyl ether.
?? The analysis can be automated via a PLC that controls the 301-B (start, calibrate, print report).
An optional operating system is Windows XP. If the 301 GC is part of the plant network, the
system can be operated from any PC on the network. Of course the system has passwords.
The detection limit for this analysis was <100 ppb (acetaldehyde), & <50 ppb (dimethyl
ether) for a direct injection with no concentration of the sample. The analysis time for this
multicomponent analysis was < 10 minutes.
Products & Services
Product Announcements
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The photoionization detector (PID) is used for the measurement of low (ppb) organic and inorganic species that can be ionized by the UV lamp (9.5, 10.6 & 11.7).
(read more)
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Photoionization detector (PID), Flame ionization detector (FID), Thermal conductivity detector (TCD), Flame photometric detector (FPD), Far UV absorbance (FUV) detector, Catalytic combustion detector...
(read more)
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Photoionization detector (PID), Flame ionization detector (FID), Thermal conductivity detector (TCD), Flame photometric detector (FPD), Far UV absorbance (FUV) detector, Catalytic combustion detector...
(read more)
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Trace oxygen monitoring in high purity water
First luminescent sensor for process ppb level oxygen monitoring
No chemicals, membranes or electrolyte (<5 minutes annual service)
Fully...
(read more)
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The ability to analytically quantify H2S in amine and other liquids is enhanced with the Sample Transfer Stripper (Membrane Technology)and ratiometric colorimetric technologies offered by Analytical...
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The ability to analytically quantify H2S in light, medium & heavy crude oil is enhanced with the Sample Transfer Stripper (Membrane Technology) and ratiometric colorimetric technologies offered by...
(read more)
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The ability to analytically quantify H2S in gasoline and other liquids is enhanced with the Sample Transfer Stripper (Patented Membrane Technology)and ratiometric colorimetric technologies offered by...
(read more)
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The ability to analytically quantify H2S in non-volatile liquids, such as naphtha, water, light crude oil, and gasoline, are enhanced with the Sample Transfer Stripper (Membrane Technology, Patent #...
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Topics of Interest
This paper discusses the recent improvements in process GC instrumentation focusing on three areas of monitoring interest: ppb Levels of BTX in beverage grade CO2, Detection of VOCs under Texas...
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When the analysis is for product quality monitoring or personnel safety assurance, the concentrations measured are often in the ppb to low ppm levels. At these low concentrations, the loss of analyte...
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A new method has been described and evaluated which will detect ppt levels of hydrocarbons in the atmosphere. An automatic GC was used with a concentrator and a photoionization detector to measure...
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Objectives include: to provide an alternative to grab sampling of VOC's in water which can lead to expensive fines if not found in a timely fashion, to provide a faster method (< 1 hour) of analysis...
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The VG Sentinel dB provides rapid detection of ppb levels of benzene in air drawn from the various points on the plant, thereby providing early warning in the event of accidental benzene release.
( Read More)
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