Talk:Gas-liquid chromatography

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Contents 1 Most common detectors??? 2 Column length 3 need drawings 4 misc additions 5 History section 6 Chromatography Article 7 fg/s 8 Methods 9 recent revision of article 10 External Links

[edit] Most common detectors???

I disagree that TCD is the most common GC detector. FID (from my experience) seems to be the general standard for most basic analyses... any thoughts? Blckdmnd99 18:59, 16 May 2006 (UTC)

You are absolutely correct. No way is a TCD the most common detector, I would say without a doubt a FID is the most common, *maybe* followed by ECD. This entire article is rather poorly put together, however somebody has been making some pretty decent contributions recently. I was going to sit down and spend some time working on this, but I have been pretty busy at work, ironically enough, developing GC and GC/MS methods. Babbles 01:35, 19 May 2006 (UTC)

I think it depends on what industry (or research area) to which you're accustomed. In my experience, TCDs are more common than FIDs--but I understand that my experience is just a narrow slice of the world of gas chromatography. I think the problem is that GC is a huge field and it's tough to do it justice in one article. I think we need more sub-articles that go into the details.

But anyway, I agree that the bit about TCDs being the most common should be re-written. If I find the time, I may change it to list both FIDs and TCDs being common, since they both have broad capabilities, with the rest of the detectors being for more specific analyses. Pi3832 11:53, 22 May 2006 (UTC)

Apparently, I found the time. Pi3832 13:18, 22 May 2006 (UTC)

Excellent, thanks! I too am plagued by too much GC / GC/MS time but really want to start getting more involved around here. It's amazing what can happen when everyone pulls their effors together! Blckdmnd99 15:53, 2 August 2006 (UTC)

Well done! The confusion in the beginning may have stemmed from the TCD being commercially available before the FID in the 1950's and thus having been the "first" detector. --Carboxen 05:25, 18 August 2006 (UTC)

[edit] Column length

wat happens when the column length is increased -- (msg from December 2004)

[edit] need drawings

It would be excellent if someone came up with drawings for this article. After all, "a picture is worth a thousands of words." Allentchang 00:14, 15 Dec 2004 (UTC)

Added the diagram. Would appreciate some feedback to improve it. -- Rune Welsh ταλκ 21:25, July 13, 2005 (UTC)

I'm an engineer for a manufacturer of GCs and detectors. I'll look through our expired patents and see if I can find anything useful to add on. Rune, your drawing hits pretty well on the concept anyway, that's how I illustrate it when I explain it to people :-) --Eigenvalue 05:08, 2 January 2007 (UTC)

[edit] misc additions

Added some more links to manufacturers and added hydrogen to the list of carrier gases. - Babbles 23:00, 24 September 2005 (UTC)

I'm thinking this thing needs an overhaul, I don't think it does a decent job of addressing various things such as column phases, length, diameter, film thickness, injector port, retention time, solvents, Gaussian peaks, solvent/Grob effects and so forth. - Babbles 23:19, 24 September 2005 (UTC)

But I don't think this main article should be too technical. It should be aimed at people who don't atually run GCs, but are interested in them for some other reason. (This is why I added the "GCs in Popular Culture" section.)

Sub-articles that address the kinds of technical details you mention would be A Good Thing, however. Pi3832 11:57, 22 May 2006 (UTC)

I think it would be great to see a little more discussion on temperature programs and software used in GC analysis. (Yes, I say this because I'm struggling with setting up a GC at work and can't seem to find much on information.) jz

What issues are you having? One possible online resource could be: http://www.chromatographyforum.com/ I do not post there and don't really keep up with it, but perhaps it could help you out some. Babbles 17:20, 2 October 2005 (UTC)

For the pop culture references, I'd like to add a reference, but I'm not sure how to merge it with the current text, which is less about the references to GC's and more criticism of its use in pop culture. Here's my reference: In the novel "Zodiac" by Neal Stephenson, the protagonist Sangamon Taylor relies on a GC to do his vigilante environmental detective work. --MM 22:03, 23 June 2006 (UTC)

Another often remembered popular misconception of what GCs can do is Sean Connery's 15-minute complete GC analysis of a cancer drug in the movie "Medicine Man" (1992). Great jungle lab. I would beleive a Helium/TCD analysis of atmospheric gases on a Molsieve column, or a CFC analysis, in that time, not one of a pharmaceutical compound. --Carboxen 05:35, 7 July 2006 (UTC)

[edit] History section

The history section is in desperate need of an overhaul. Fuzzform 19:24, 06 Dec 2005 (UTC)

[edit] Chromatography Article

The Chromatography article has all of two sentences about GC. And they aren't even entirely correct. Anyone want to volunteer to go edit/expand that? Pi3832 15:38, 22 May 2006 (UTC)

[edit] fg/s

I have seen the sensitivity of chromatographs expressed in fg/s. Can someone explain what this measure is please. Lumos3 22:29, 22 May 2006 (UTC)

Femtograms per second. See the metric system article. Pi3832 16:19, 23 May 2006 (UTC)

[edit] Methods

I've added a section on Methods, in which to discuss some general information on method developement. If it gets too detailed we may want to make a separate article(s), but I think this is a good place too start. Please, please, please feel free to compose stuff for this section--the subsections, especially.--Pi3832 14:33, 7 June 2006 (UTC)

[edit] recent revision of article

Heya all, I have reordered the article a bit a few days ago, to make it be more organized. Various great sections had sprouted recently and it became a collection of subsections without much order (I am not innocent), that I thought distracted from the big picture. Let me know if there are any such changes you disapprove of. Also, volunteers are sought for the sections Data Reduction and analysis (software, integrators, retention indices, databases, mass fragmentograms, etc) and Column selection (phases, dimensions) - I wouldnt mind collaborating. Carboxen 00:57, 22 October 2006 (UTC)

[edit] External Links

Not including external links for vendors on this page is fairly clearly covered in the WP:External links guideline. Links to be avoided #4: "Links to sites that primarily exist to sell products or services."

Links to help sites, I feel, fall under the Important points to remember part of the WP:External links guideline. Specifically:

1. Links should be kept to a minimum.
2. Rather than creating a long list of external links, editors should consider linking to a related category in the Open Directory Project (also known as DMOZ) that is devoted to creating relevant directories of links pertaining to various topics. (See {{Dmoz}}.) If there is no relevant category, you can request help finding or creating a category by placing {{Directory request}} on the article's talk page.

DMOZ already has a category for Gas Chromatography, and I have put a link to it in the article.

If there is some external link that can be included within the WP:External links guideline, and explanation on this page would help to keep it from being removed from the article. Thanks. --Pi3832 18:24, 12 March 2007 (UTC)