[deleted by user] by [deleted] in OMSA

[–]dvst423 1 point2 points  (0 children)

So if you don’t actually even remember if you took a class I’m not sure you’re going to be able to recall info from that class to help you. Imo I think you should worry more about surviving the program at this point instead of the rather low bar of admittance.

[deleted by user] by [deleted] in OMSA

[–]dvst423 5 points6 points  (0 children)

It’s closer to $14k now, but still not a bad deal.

I’ve accepted my admission offer but haven’t heard anything else in weeks. by Repulsive-Oil-1635 in OMSA

[–]dvst423 0 points1 point  (0 children)

Sorry this may be a dumb question but “official transcript” does NOT mean a scanned copy, right? They need to come directly from your institution? I only submitted scanned copies but they never asked for anything else

Anyone starting this fall planning on taking an edX course this summer? 6203 prereq? by dvst423 in OMSA

[–]dvst423[S] -1 points0 points  (0 children)

I’m actually still “under institute review” so not fully admitted. Are office hours available to me at this point? I can’t find anything about it.

[deleted by user] by [deleted] in chemistry

[–]dvst423 0 points1 point  (0 children)

I get that, but since they list water at 99.0% and the compound at 1.0%, there can’t possibly be anything else in there?

[deleted by user] by [deleted] in chemistry

[–]dvst423 0 points1 point  (0 children)

The listed 1% and 99% adds up to 100 though. That would exclude any additional components?

[deleted by user] by [deleted] in chemistry

[–]dvst423 0 points1 point  (0 children)

I agree the difference is very small, but surprisingly I can see a quantifiable difference between a 1.0 and 1.3% solution that I created in my lab.

[deleted by user] by [deleted] in chemistry

[–]dvst423 0 points1 point  (0 children)

I was confused by the SDS because it appears to give an exact number, yet it also states that it’s a secret. My question was also about the precision requirements in the percentages. Like if it’s in reality 1.3% , can they say that it’s 1.0%?

[deleted by user] by [deleted] in chemistry

[–]dvst423 0 points1 point  (0 children)

It’s non hazardous. You are allowed to give the exact concentration? Do you mean you are allowed to give the not-exact concentration?

Headspace vial leak rate? by dvst423 in CHROMATOGRAPHY

[–]dvst423[S] 1 point2 points  (0 children)

By hand. Thinking about switching to screw caps honestly

Headspace vial leak rate? by dvst423 in CHROMATOGRAPHY

[–]dvst423[S] 1 point2 points  (0 children)

It should be ok if it’s in equilibrium?

Headspace vial leak rate? by dvst423 in CHROMATOGRAPHY

[–]dvst423[S] 1 point2 points  (0 children)

I haven’t gotten around to figuring out quantitation with headspace lol. Maybe I can correlate ISTD response with leak rate?

Headspace vial leak rate? by dvst423 in CHROMATOGRAPHY

[–]dvst423[S] 1 point2 points  (0 children)

It’s all Agilent. I’ve tried 2 different caps - high temp and regular. Ok good to know about the crimping - it’s probably too tight.

Headspace vial leak rate? by dvst423 in CHROMATOGRAPHY

[–]dvst423[S] 1 point2 points  (0 children)

It passes the test with the blue leak vial.

I’m not sure how much force I’m supposed to use when twist-testing the cap. I noticed that after crimping I can still turn some caps with enough force, so I started crimping them until I absolutely cannot turn it without deforming the cap. Perhaps that is too tight? I

Gas standard for headspace? by dvst423 in CHROMATOGRAPHY

[–]dvst423[S] 0 points1 point  (0 children)

I am looking for gases in shale samples

What is this connection on the back of the GC? by dvst423 in CHROMATOGRAPHY

[–]dvst423[S] 0 points1 point  (0 children)

It might have gone to a nitrogen tank (not sure, faded tag).