In our line of work, there is but one answer to this question:
"Who knows? Weigh 5 mg into a tin capsule and we'll put it into the EA and see what happens"
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Kentucky Stable Isotope Geochemistry Lab (KSIGL)
119 posts
Kentucky Stable Isotope Geochemistry Lab (KSIGL)
@KY_Isotopes
University of Kentucky Department of Earth and Environmental Sciences Katılım Kasım 2018
227 Takip Edilen221 Takipçiler
@And1129 I think our GasBench, in it's own special way, has been asking for the same treatment this week...
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I am taking apart and cleaning the Valco 6-way valve in our Thermo Gasbench.
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@dimorei @labioarqueologa @ChrisStantis @chris_tt_cheung @WolfmannotJack @Andrea_Erhardt I agree with Wolfram, but if you do decide on a proof-of-concept study on yourself please count me out of the sampling portion. We're pretty good friends but I hate blood.
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Any thoughts? @labioarqueologa @ChrisStantis @chris_tt_cheung @KY_Isotopes @WolfmannotJack @Andrea_Erhardt
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#Stableisotope researchers: My dentist gave me a paste for tooth sensitivity. You put some on the tooth & you can safely swallow after 2 mins. It's made out of milk protein casein--contains Ca & PO4.
Do you think this could alter the oxygen isotope comp. of my tooth enamel?🦷
GIF
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this AGU i've realised that i have a GIANT bee in my bonnet; this bee says "del ≠ delta" and i KNOW that it's a silly overly pedantic bee but at the end of a day watching isotope talks i just can't take anymore 'del-O-18'
that or i've just run out of patience for 2020 generally
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@climate_badger You aren't alone in this battle. Long live Coplen 2011!
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I have also been fighting a one person battle with journal style guides to italicise the delta and put a space between the numeral and permil symbol as per Coplen 2011 (doi.org/10.1002/rcm.51…) but accept this is a niche pursuit.
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This. If you say "del" you mean nabla, which has nothing to do with stable oxygen isotopes.
Dr Georgy Falster@raindrop_herder
this AGU i've realised that i have a GIANT bee in my bonnet; this bee says "del ≠ delta" and i KNOW that it's a silly overly pedantic bee but at the end of a day watching isotope talks i just can't take anymore 'del-O-18' that or i've just run out of patience for 2020 generally
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Kentucky Stable Isotope Geochemistry Lab (KSIGL) retweetledi
On Wed, Dec 9th, from 2-3 pm, I am giving a public lecture prior to my thesis defence. This lecture is open to the public. If you are interested, DM me and I will send the Zoom link.
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@KimBaublys @USGS We've had great success with IAEA-SO-5 and IAEA-SO-6 for d18O-BaSO4 too!
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@KimBaublys @USGS Sometimes I wished we analyzed waters vis TC/EA just so I could use these...
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@And1129 That's so cool! Keep us posted!
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@KY_Isotopes I love the TC/EA too! I'm developing a hematite method for oxygen that is looking promising!
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Trying to figure out what this tiny little early peak is in my CO chromatogram. I'm thinking probably N2.
Logan, UT 🇺🇸 English
@And1129 I tried three different brands of AgCl, all of which had horrible blanks, before settling on 99.99% graphite powder as an additive. Beautiful peaks and reproducibility. People complain about it, but I love the TC/EA. Such a freaky little box.
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@KY_Isotopes That's what I was thinking too, but it never occurs with blanks, but always with this one particular reagent: Nickel Carbon wool. Odd.
Logan, UT 🇺🇸 English
@And1129 Nah, it was easy. A quick computer + Isodat reboot and we were back in action. Thankfully it wasn't a sample though.
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"How many layers of chromatography are you on?"
"IDK, like 2 or 3?"
" You are like a little baby. Watch this."
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@And1129 I started using USGS64 glycine for carbon work where we expect values near or lower than -30 permil. Great standard, always very consistent.
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@KY_Isotopes Those are my two Glycine standards I may have told you about. I synthesized them spiking one with 13C. Delta values are -47.45 and +4.88 per mil VPDB respectively.
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@WolfmannotJack @Andrea_Erhardt I'm assuming it was vegetable oil, although it could have been something else. They're a great client and we knew what we were getting into. I do love the LGR for the fact that I simply had to pull the injector block and clean it and we were back in action!
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@KY_Isotopes @Andrea_Erhardt Some people have no clue about nothing. I admire your patience. I would have returned the crappy samples to sender. Did you tell them to use silicone oil the next time? Even paraffin oil would have been a better choice than vegetable oil.
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Collecting samples for d13C in DIC and DOC but can't follow typical preservation methods? We found that even if you can't refrigerate the sample or process it straight away, just filtering the sample was the best method for preventing fractionation. DOI: 10.1002/rcm.8903
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@WolfmannotJack @Andrea_Erhardt This is great! I'll give it a shot if we encounter more samples like this!
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@KY_Isotopes @Andrea_Erhardt One trick to try next time would be adding a few drops of n-heptane to get a clearer phase separation, but I hope for your sake there won’t be a next time. 😉
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@WolfmannotJack @Andrea_Erhardt Almost no separation of oil and water in the affected samples. I missed a few on the first session and ended up having to abort to clean an oily injector block. After that I tried vigorous centrifuging and then syringing with 0.45 and then 0.2 micron syringes. No luck...
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@KY_Isotopes @Andrea_Erhardt I never had that happen to me but I’m not surprised. 😂😂😂
Out of curiosity, what was the occasion?
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