Comment on Flowchart for STEM
skillissuer@discuss.tchncs.de 1 month agoLike, so what if we store our tBuLi with other low-flash point flammables? And pyrophoric oxidizers? In the same bin? That’s stuck in a block of ice because in the 30-year-old freezer because it hasn’t ever been de-iced?
That’s just bad management and you shouldn’t store tBuLi that long anyway because it’ll decompose
Oh, while you’re here, does this still smell like DCM? I can’t tell if I rotavapped it all off and the NMR tubes all need aqua regia (sorry my b).
just put it on high vacuum
What are you working with that requires aqua regia to clean NMR tubes? I’ve only had to use piranha once in a decade, while cleaning things that acetone, DCM, and basic ethanol won’t touch, and this was just after moving to another lab
ornery_chemist@mander.xyz 1 month ago
Yes. The whole thing is satirizing the “Safety -> Against” bit. Each piece, though exaggerated for effect, has a basis in something I’ve seen over the years.
Regarding NMR tubes though, the answer in my old group was precious metal complexes, which have a tendency to mirror out once they’ve done their bit. Or just existed for too long; a lot of them were touchy. The mirror tends to resist solvents and scrubbing. Nitric acid alone sometimes was enough to remove the it depending on the metal, but often not. At some point the cost, effort, and danger is supposed to outweigh just binning the lot and buying new tubes, but my PI was allergic to buying new things.