Has anyone learnt unsymmetrical dimethylhydrazine extraction from hydrocarbon refining?
- Thread starter Bender
- Start date
Dont get me started, I dont have the time for a full response so here is a short answer,
Quantification of trace concentrations of transformation products of rocket fuel unsymmetrical dimethylhydrazine (UDMH) in water requires complex analytical instrumentation and tedious sample preparation. The goal of this research was to develop the simple and automated method for sensitive quantification of UDMH transformation products in water using headspace (HS) solid-phase microextraction (SPME) in combination with GC-MS and GC-MS/MS. HS SPME is based on extraction of analytes from a gas phase above samples by a micro polymer coating followed by a thermal desorption of analytes in a GC inlet. Extraction by 85 µm Carboxen/polydimethylsiloxane fiber at 50ºС during 60 min provides best combination of sensitivity and precision. Tandem mass spectrometric detection with positive chemical ionization improves method accuracy and selectivity. Detection limits of twelve analytes by GC-MS/MS with chemical ionization are about 10 ng L-1. GC-MS provides similar detection limits for five studied analytes, however the list of analytes detected by this method can be further expanded. Accuracies determined by GC-MS were in the range of 75-125% for six analytes. Compared to other available methods based on non-SPME sample preparation approaches (e.g., liquid-liquid and solid-phase extraction), the developed method is simpler, automated and provides lower detection limits. It covers more UDMH transformation products than available SPME-based methods. The list of analytes could be further expanded if new standards become available. The developed method is recommended for assessing water quality on the territories affected by space activities and other related studies.
Quantification of trace concentrations of transformation products of rocket fuel unsymmetrical dimethylhydrazine (UDMH) in water requires complex analytical instrumentation and tedious sample preparation. The goal of this research was to develop the simple and automated method for sensitive quantification of UDMH transformation products in water using headspace (HS) solid-phase microextraction (SPME) in combination with GC-MS and GC-MS/MS. HS SPME is based on extraction of analytes from a gas phase above samples by a micro polymer coating followed by a thermal desorption of analytes in a GC inlet. Extraction by 85 µm Carboxen/polydimethylsiloxane fiber at 50ºС during 60 min provides best combination of sensitivity and precision. Tandem mass spectrometric detection with positive chemical ionization improves method accuracy and selectivity. Detection limits of twelve analytes by GC-MS/MS with chemical ionization are about 10 ng L-1. GC-MS provides similar detection limits for five studied analytes, however the list of analytes detected by this method can be further expanded. Accuracies determined by GC-MS were in the range of 75-125% for six analytes. Compared to other available methods based on non-SPME sample preparation approaches (e.g., liquid-liquid and solid-phase extraction), the developed method is simpler, automated and provides lower detection limits. It covers more UDMH transformation products than available SPME-based methods. The list of analytes could be further expanded if new standards become available. The developed method is recommended for assessing water quality on the territories affected by space activities and other related studies.
Is the base feedstock for UDMH pulled from on site Amine units? I have calibrated oriface meters on amine skid units but lacked the information of what the amine is used for.
Behave yourselves or I'll start in on obscure questions of foreign language grammar points.
I can boil water. Check with Pubic Stent...
He probably started a thread like this somewhere.
Cheers,
Sirhr
He probably started a thread like this somewhere.
Cheers,
Sirhr
@ArmyJerry
You forgot to curse the Rep and Dems or recommend more ammo purchases.
Just saying.
Maybe the Mrs swiped your Hide account? ?
Interesting reading. Need more motrin now......
You forgot to curse the Rep and Dems or recommend more ammo purchases.
Just saying.
Maybe the Mrs swiped your Hide account? ?
Interesting reading. Need more motrin now......
I too was going to say, "some fuckery is running amok" simply due to the fact of "Who are you and what have you done with ArmyJerry?????"
We know this isn't him, and we know this is someone else, simply because of the "buy more ammo" was not the final sentence. Therefore, FBI has been notified due to hostage-taking and also due to "impersonating a,,,,,, (not sure what to call him but I'm sure there's a law against it..)"
So there.
im sitting 50yds from my 2 amine units right now ....... shell oil pays me to make em run....
The yellow crayons are tasty, but the green are my favorite.
I used to. I once knew how to make liquified fuel from natural gas as well. However since I don't work in that field anymore I have forgotten and don't care to ever remember. Good career, just not what I enjoy.
If I want to create carbon, I just go to the range and foul the AR parts
