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GC method to quantify N,CO2,CO,He and H
Posted: Wed Mar 01, 2017 9:09 pm
by oacfsm
Could someone recommend me a GC method to separate Nitrogen,Carbon Monoxide,Carbon Dioxide,Helium and Hidrogen.
Re: GC method to quantify N,CO2,CO,He and H
Posted: Tue Mar 07, 2017 1:33 pm
by GasMan
You need to give more information.
What concentrations are these compounds. Are these the compounds that you wish to measure in a mixture which also contains other gases and vapors. You are limited to using a thermal conductivity detector using argon as a carrier gas, which will also affect the lower limits that you can measure.
Are you planning to order a new GC, if so the supplier of the GC should be able to suggest what to order. If you already have a GC, what do you have installed on this GC such as detectors, inlets and any valves.
Gasman
Re: GC method to quantify N,CO2,CO,He and H
Posted: Thu Mar 16, 2017 7:16 pm
by muGC
Another option is to have a 2 channel system that injects the sample on both channels at the same time. One channel quantifies N2, CO2, CO using a TCD with He carrier. The other channel quantifies He and H2 using a TCD with N2 carrier. This similar to how a Refinery Gas Analyzer is set up.
Re: GC method to quantify N,CO2,CO,He and H
Posted: Fri Apr 07, 2017 2:39 pm
by chromatographer1
A two column (PP Q / MS5a ) reverse column step multidimensional GC application with perform your analysis quickly.
Otherwise, a Carboxen 1000 column at somewhat elevated temperatures (100°C or more) should do the analysis within 30 minutes.
best wishes,
Rod
Re: GC method to quantify N,CO2,CO,He and H
Posted: Wed Apr 12, 2017 12:02 am
by Lijun-Zhang
I used a GC with the detector of DID for air impurity analysis of N,CO2,CO,He and H2 in high purity gas. It was installed two columns. One is packed molecular sieve, another one Q HayeSep Q. The carrier gas is He.
Re: GC method to quantify N,CO2,CO,He and H
Posted: Wed Apr 12, 2017 12:03 am
by Lijun-Zhang
I used a GC with the detector of DID for air impurity analysis of N,CO2,CO,He and H2 in high purity gas. It was installed two columns. One is packed molecular sieve, another one Q HayeSep Q. The carrier gas is He.
Re: GC method to quantify N,CO2,CO,He and H
Posted: Wed Apr 12, 2017 4:24 am
by chromatographer1
Concentrations are critical to the proper choice of detector and columns.
You have received replies which differ greatly. You have not replied back so I assume your question is theoretical and the details are not important.
Rod
Re: GC method to quantify N,CO2,CO,He and H
Posted: Tue Jan 16, 2018 9:32 pm
by TripG's
Hi oacfsm,
Sorry if this is a late reply to the question...new user, my work email is down and my customers are silent.
Being a sales guy for Siemens and a former multi-dimensional methods development turned sales guy, here's the poop...
Based upon the following assumptions;
No CH4, No O2/Ar, measurement range around 1,000ppm to 100% for each species & output for CO2 as "CO2+" or heavier.
Maxum II GC would require; 8 Cell TCD on two applications via parallel chromatography. Two 10 port Model 50 valves, Micro-packed columns of Hayesep N 100/120 & 5A Mole Sieve 100/120 with H2 carrier for the N2, CO & CO2+ (backflush to detector) and two micro-packed columns of Hayesep N 100/120 with N2 carrier for the H2 & He. Isothermal oven at 140F/60C and an overall cycle time of ~240seconds...or less.
We've tweaked our TCDs sensitivity in recent years with MDLs approaching 5ppm minimizing the need for flame detectors. Customers really, really like simple applications without flame detectors.
I can send additional information if needed. Call Siemens at 918-662-7000 & ask for Gregg