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- Posts: 478
- Joined: Fri Jun 02, 2017 11:10 pm
- Location: Western Colorado
This is really motivating me to switch to hydrogen.
Discussions about GC-MS, LC-MS, LC-FTIR, and other "coupled" analytical techniques.
LALman wrote:
Two months ago a T cylinder of UHP He was $375. It just jumped to $830 for my latest cylinder. Another supplier can't get He at all for at least a couple months.
This is really motivating me to switch to hydrogen.
Steve Reimer wrote:
James:
We are still looking in to switching to hydrogen and already have switched everything but the GCMS units. 8260/624 is almost impossible until some allowances are made from EPA.
What is the main problem with 8260? Tuning or reactivity? The tune criteria were adjusted in 8260D to allow hydrogen but there wasn't much input on problems labs were facing.
Reactivity is another can of worms all together.
LALman wrote:
I also, am using nitrogen from a dewar as my purge gas and general use gas.Steve Reimer wrote:
James:
We are still looking in to switching to hydrogen and already have switched everything but the GCMS units. 8260/624 is almost impossible until some allowances are made from EPA.
What is the main problem with 8260? Tuning or reactivity? The tune criteria were adjusted in 8260D to allow hydrogen but there wasn't much input on problems labs were facing.
Reactivity is another can of worms all together.
Its the 96 mass in BFB that gets too large at the expense of mass 95 which becomes proportionally lower and that affects the 174/95 ratio. I assume the hydrogen is adding a proton to the 95 mass. The other losses were as I said for brominated and chlorinated compounds about 25% of the signal area you would get with helium. It helped me to purge with argon or nitrogen and then dry purge with helium for 1 minute before desorption. In my experience hydrogen reacts more with the 8260 analytes under argon or nitrogen but less so with helium; that helped the recoveries of halogenated compounds.
benhutcherson wrote:
I finally got around to calling today.
We're at $205, which is up from $175 earlier this year on a "300" sized cylinder. Still, the price increase was moderate enough that I went ahead and ordered 3.
Now to get more chains and clamps rigged before they come tomorrow...
benhutcherson wrote:
I finally got around to calling today.
We're at $205, which is up from $175 earlier this year on a "300" sized cylinder. Still, the price increase was moderate enough that I went ahead and ordered 3.
Now to get more chains and clamps rigged before they come tomorrow...
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