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Gas Chromatography Gas Chromatography
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  • ablake and m4esti like ron_tackett's reply Re: GCMS drops in baseline with recovery during no-injection post maintenance
  • labgod4 likes nhart's reply Re: Post Your GC Selfie!
  • nhart, alfausett, and james_jenkins like labgod4's reply Re: Post Your GC Selfie!
  • labgod4 likes nhart's discussion Post Your GC Selfie!
  • danots likes cduvekot's reply Re: Low level Oxygen and CO by 490 Micro GC in plant's nitrogen supply
  • danots likes remkovanloon's reply Re: Low level Oxygen and CO by 490 Micro GC in plant's nitrogen supply
  • james_jenkins likes alfausett's reply Re: GC-FID/MS
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ablake
ablake in Mass Spectrometry2 days ago (Show moreShow less)
GCMS drops in baseline with recovery during no-injection post maintenance
System specs: Agilent 6890N with 5975 iMSD and MassHunter GCMS Acquisition/ Enhanced Chemstation Data Analysis Split liner, helium carrier gas, flow=3ml/min during bake outs and 1mL/min all other time   The vacuum system failed over a weekend and was replaced with a refurbished unit. Pumped down and sat for a week at ambient temps. Then we… (Show moreShow less)
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ablake
ablake (to ron_tackett) 2 days ago (Show moreShow less)
Okay, changed mass range to 35-500 and threshold to 100 (was 150) and just started the sequence to run three times. Will post results in the morning.   Also, ran it three more times with previous settings this afternoon to see if there was any sort of pattern...
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nhart
nhart Employee in Gas Chromatography3 weeks ago (Show moreShow less)
Post Your GC Selfie!
Who has the longest running Agilent GC?! Post your GC Selfie and showcase how long your system has been running. What is the name of your GC? How many GC injections? Register or login to post your picture as a selfie, with the run count, or just the instrument. Post the photo of your instrument on this thread and we will select one of your photos… (Show moreShow less)
in Gas ChromatographyLike (1)
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nhart
nhart Employee (to labgod4) 2 days ago (Show moreShow less)
Love the name! Thanks for sharing the picture and it's history!
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eme091
eme091 in Gas Chromatography3 weeks ago (Show moreShow less)
Low level Oxygen and CO by 490 Micro GC in plant's nitrogen supply
Utilizing a 490 Micro GC with a TCD and MolSieve 5A 20 m column we are attempting to determine the purity of our plant's nitrogen as Airgas( run the nitrogen generation plant on site) can not provide chromatography or proof of the 99.99% purity of their nitrogen.  We were told by the sales rep that the 490 micro GC can see down to the 5ppm levels… (Show moreShow less)
in Gas ChromatographyLike (0)
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danots marked remkovanloon's reply as helpful
mj.hazlett
mj.hazlett in Gas Chromatography3 days ago (Show moreShow less)
Recent reproducibility issues and increase in peak fronting after consecutive injections
The model number on GC is 6890N (G 1540N). I am using a method with split injection with 50:1 split ratio on hp-5 column to measure concentration of a methanol/water mixture using ipa as an internal standard. The method has been successfully used giving a reasonable standard deviation for several months, and recently the standard deviation… (Show moreShow less)
in Gas ChromatographyLike (0)
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james_jenkins
james_jenkins Employee (to mj.hazlett) 3 days ago (Show moreShow less)
I think we need to see the method parameters. The 0.2 valve switch is short, that may be to compensate for vapour volume. Water in your sample, depending on percentage can be very difficult to contain inside the liner as it has vapour volume that can easily expand beyound the liner and cause carryover and other issues. The method parameters as a…
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  • the.chemist, sonukaul, thoerter, jeaton, kenda, go4th, arienne, sylviadai, vechamvenkatesh, mmcmenamin, allhemptrading, randybolger, evanbloois, nhart, slk, and òscar updated avatars:

    the.chemistsonukaulthoerterjeatonkendago4thariennesylviadaivechamvenkateshmmcmenaminallhemptradingrandybolgerevanblooisnhartslkòscar
mauricio
mauricio in Software6 days ago (Show moreShow less)
Compound math in quant analysis B07.00
Hi, I need to calculate total xylene from p Xylene, m Xylene and or Xylene. I have Masshunter Quant Analysis B07.00 Build 7.0.457.0 In the options of the quantifier table I only have the option Cmpd. Group and I can not select Compound math since it does not exist in the drop-down list. Can this be done with this version? Thank you
in SoftwareLike (0)
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mauricio
mauricio (to ryoboyle) 3 days ago (Show moreShow less)
Thank you very much for the information. I'll try the second alternative for the moment
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ryoboyle
ryoboyle Employee in Software4 days ago (Show moreShow less)
Instructions for Enabling Compound Math on B.03.0x-B.07.00
The attached document walks through how to enable the compound math functionality in MassHunter Quantitative Data Analysis revisions B.03.0x-B.07.00.   Note: A new concept of Compound Math was introduced with MassHunter Quantitative Data Analysis B.07.01 making the calculations straightforward. Several new videos are available to introduce and…
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