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 1 
 on: Today at 04:11:09 AM 
Started by sasol - Last post by crawlingmcedge
I hope no one is actually thinking about seriously buying isotopes off a Slovenian seller on ebay. Anyone doing this actually deserves to be scammed for sheer stupidity.

I suspect 18 Oxygen is more used for Mass spec studies since it is Spin 0 and thus NMR silent.

17 O is spin 5/2 and would be NMR active for quadrupolar NMR.




 2 
 on: Today at 04:09:18 AM 
Started by zenorin - Last post by wildfyr
Maybe store and transport it as a solution in water rather than a dry powder, if its use is to spread on fields anyway.

The reason they don't, as always, is cost. The cost of shipping a water slurry is higher than the pure solid.

 3 
 on: Today at 04:04:31 AM 
Started by jezaza - Last post by Babcock_Hall
Deprotections of esters of carboxylic, phosphoric, and phosphonic acids can take at least two paths.  One can envision attack at the carbonyl or phosphoryl atom, or one can envision an attack elsewhere.

 4 
 on: Today at 03:27:32 AM 
Started by Borek - Last post by Arkcon
Thank you to everyone, I'll still come around to help, just a bit less intensive.

Cheers all.

 5 
 on: Today at 03:21:05 AM 
Started by Enthalpy - Last post by Enthalpy
What you ae suggesting is still allot more expansive per neutron if yo do the math.

Can you show us your maths? The SNS has already cost 1.4G$, while the tokamak I suggest is 1000 times smaller than the existing ones.

 6 
 on: Today at 03:08:34 AM 
Started by sasol - Last post by sasol
Hi Hacktacular

Thank you for your reply.

Interesting very usefull application.  There is also O-18 - H2O2 posted recently.
does O-18 has same properties? Because its way more affordable :)

https://www.ebay.com/itm/18-O-labeled-H2O2-hydrogen-peroxide-H218O2-80-atom-18-O-10-wt-in-water/142836279002?hash=item2141b4a6da:g:VMcAAOSwdm1bJoGq

Thank You !

 7 
 on: Today at 02:50:25 AM 
Started by zenorin - Last post by Enthalpy
Pure ammonium nitrate detonates but it needs some initiator, which can be a big enough deflagration (=slower than detonation) of ammonitrate if mixed with some fuel. So a limited amount of some fuel somewhere on ammonitrate suffices to detonate everything just with an ignition source.
https://en.wikipedia.org/wiki/Ammonium_nitrate#Explosives
check also the MSDS (=Material Safety Data Sheet)

An other initiator class just sensitizes ammonitrate, and hypochlorite (=bleach) is a known example. Not chlorine, which is a gas. It has been cited as a possible cause at AZF. Though, tainting ammonitrate with anything, and certainly with bleach, is not what you can expect from workers at an ammonitrate plant who know their job.

----------

A part of the story is little known. On that same day in Toulouse, few kilometres and seconds apart, SNPE's plant producing hydrazines for Ariane exploded too. Probabilities speak against a coincidence. Alternately, both plants can have been attacked (this was little after the Twin Towers). Or the explosion at one plant damaged the other.
http://www.usinenouvelle.com/article/proces-azf-faut-il-aller-voir-du-cote-de-l-armee.162919
fun: usinenouvelle sends to a different article now, but never mind, I append the original one here under. Replace the extension txt by htm.
http://www.sudouest.fr/2012/08/29/azf-la-these-officiel-le-remise-en-cause-806412-4697.php

Hydrazines are very toxic, and building such a plant within the already existing neighbourhood was a criminal negligence that has not been investigated by the Justice.

The linked newspapers tell about 10t of UDMH had leaked. This would have had catastrophic sanitary consequences for the inhabitants. One SNPE worker died in the following explosion. While UDMH ignites very easily, possibly the worker sacrificed himself to ignite the leak and avoid to poison 100k people.

4s to the explosion at AZF, that can be the flight time of a debris that hit the ammonitrate there. Other people suggest the air or ground shake ignited the ammonitrate.

Anyway, rocket operators want to get rid of hydrazines, and the production plant was at the wrong place.

----------

Ammonitrate has already killed more than thousand people over more than a century.
https://en.wikipedia.org/wiki/Ammonium_nitrate_disasters
It would be about time to qualify it legally as an explosive, not as a fertilizer. Then the industry would take the appropriate steps to prevent explosions. Maybe store and transport it as a solution in water rather than a dry powder, if its use is to spread on fields anyway.

 8 
 on: Today at 02:08:38 AM 
Started by nawinince - Last post by Enthalpy
Not an answer to the original question, rather an observation:

Atomic and ionic radii have half a dozen different definitions with discrepancies like 30%. This results logically from atoms having a fuzzy limit, and this limit changing with the chemical bonds. For instance, LiH packs more H atoms per volume unit than pure solid H2.

So if you get a reasonable density from a computation based on atomic radii, it means that said radius was deduced from the density, or tweaked for the purpose of an assignment.

 9 
 on: Today at 01:14:11 AM 
Started by anp22112 - Last post by billnotgatez
Go see a doctor or go to a medical urgent care facility.
For liability reasons we can not give medical advice on this forum.

 10 
 on: Yesterday at 09:38:46 PM 
Started by anp22112 - Last post by anp22112
Help. My inner cheek tissue and gums have become hardened due to what could possibly have been formalin, or some kind of fixative. From the research I've done it was probably something related with Formaldehyde or Paraformaldehyde, as there was a white precipitate on the bottom of the solution. How do I remove this from my inner mouth skin (mucous membranes)? It happened at a lab where I was supposed to get a sample of my saliva tested for infection, but the lady made a mistake and instead of just collecting a sample of my saliva around my salivary gland with a dry cotton swab, she submerged the swab in a liquid that had white precipitate at the bottom which she stirred and put into my mouth, probably because I said I felt my mouth was a bit dry. Since then my inner cheek tissue and gums are hard as a rock and when a bit comes off it tastes salty, and I can't find a way to make it back to normal. How can I remove or soften this, or make it peel off, given it is in a moist tissue.

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