Talk:NMR tube

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Addition of TMS

I took out the line on adding TMS because most spectrometers now use the residual solvent peaks as references. Also, TMS should be added to the stock solvent, and not added neat to the NMR tube because it will be far too concentrated. --Rifleman 82 10:44, 9 November 2006 (UTC)[reply]

Rifleman 82 -- True, but maybe it would be better to say:

If an NMR reference standard (such as TMS) is required, and not already present in the deutrated solvent, this can be added carefully to the sample.

TMS can be added to a nmr sample but only very carefully! Also, you might want to added some other reference e.g. a solid, not just TMS ...

Is your statement above about referencing to solvent peak true for all nuclei e.g. 31P, 19F etc? It is not common but in 31P NMR people can used mixed solvent system e.g. the compound is dissolved in say non-Deuterated THF (i.e. H's will not effect the 31P spectrum) and the D lock is provided by adding a small amount of say D6-benzene. Quantockgoblin 11:06, 9 November 2006 (UTC)[reply]

Removed template:move to Wikibooks

Removed the tag because the article is notable and encyclopedic. If there are any other concerns they should be raised here first. --Rifleman 82 17:04, 9 November 2006 (UTC)[reply]

Merger

I've been bold and merged NMR tube cleaner into this article. This is a dump of the talk page for reference:

Removed template:move to Wikibooks

Removed the tag because the article is notable and encyclopedic. If there are any other concerns they should be raised here first. Quantockgoblin 17:44, 9 November 2006 (UTC)[reply]

Merge to NMR tube

Should we merge? I notice that everything in this article is in the NMR tube article; unless it can be fleshed out in much more detail without violating WP:NOT (and I dont' think it will be easy), I think we should replace this page with a redirect. --Rifleman 82 10:55, 26 July 2007 (UTC)[reply]

Cleaning Section

The cleaning section is largely a guide, which Wikipedia is not. Also, it's uncited and unnecessarily complicated. Bottledmark (talk) 03:53, 31 January 2008 (UTC)[reply]

I disagree this section describes a common apparatus which is best understood through a functional description. Anyone interested in NMR tubes would be interested in intimately linked glassware. If the description can be simplified that would be great but I think its fine now. I'll look for a citation however a photo of an actual setup may be a better reference.--OMCV (talk) 15:33, 7 April 2008 (UTC)[reply]

I concur with OMVC, I did not know of the existence of such a tube and found my way here. The need to and method of cleaning the tubes was very illuminating. The avoidance of the chromic acid for other than toxicity reasons was also very thoughtfully indicated and avoids someone making the mistake if they are indifferent to the chrome toxicity issues but have the product available. The way that the cleaning apparatus achieves maximum flow at the tip of the tube using vacuum to draw the solvent/detergent up is also brilliant, using vac in the centre would just cause cavitation and slow replenishment through the annular gap and using pressure in the centre would be a projectile launch danger, very cunning. The complexity is at a minimum and similar digressions have been found in encyclopaedia through the ages. Idyllic press (talk) 20:46, 11 February 2019 (UTC)[reply]

Shigemi tubes?

Shouldn't there be any mention of Shigemi tubes? They are of a much different construction, and are extremely useful for smaller volumes, ~300 ul, of sample. best, Sunil060902 (talk) 10:27, 25 June 2008 (UTC)[reply]

Not familiar with this. A quick web search shows the official website (at Geocities!) [1]. Perhaps if you know more, you can describe it here? --Rifleman 82 (talk) 10:57, 25 June 2008 (UTC)[reply]

The Sigma-Aldrich site has more info including diagrams, but I have some free pics which I hope to upload tonight! Basically the smaller volume allows concentrated samples, but the reduced sample depth is compensated for by solid glass on the NMR tube beneath the level of sample, which varies for the make of Spectrometer (eg. 8 mm for Bruker, 15 mm Varian). The sample is sealed by a glass plunger whose position can be manually altered depending on the exact volume of sample. The plunger also acts to provide extra "sample height" above the sample. Once air bubbles have been expelled, the plunger is secured to the tube proper by parafilm. best, Sunil060902 (talk) 13:26, 25 June 2008 (UTC)[reply]

Did you see my message on my talk? Anyway, here are three images which I hope will be of good enough quality to insert into the main article:

plunger/insert centre, left 8 mm "bottom length" outer tube suitable for Bruker and Varian NMR spectrometers, right 15 mm outer tube suitable for Varian only

Fully assembled 8 mm Shigemi, insert secured to outer tube with parafilm

Close-up of the sample lying in between insert and "bottom length"

best, Sunil060902 (talk) 23:27, 26 June 2008 (UTC)[reply]

THanks for that. I've written it into the article as best as I can, please feel free to expand. --Rifleman 82 (talk) 00:14, 27 June 2008 (UTC)[reply]

Needs expanding

How are the tubes themselves made? what are they made of?? This seemingly pertinent information is missing from this article. -- œ ^™ 18:18, 8 January 2010 (UTC)[reply]

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