Copyright © 2020 Elsevier B.V. or its licensors or contributors. I looked up other mass spectra of acetic acid online.... and they got nice fragments around 43/45 and 29. 488 052020 To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Copyright © 1991 Published by Elsevier B.V. International Journal of Mass Spectrometry and Ion Processes, https://doi.org/10.1016/0168-1176(91)80045-O. so it should actually work, if we first make Q1 for 61 and then look for fragments. The average kinetic energy release observed is higher than that calculated on the basis of quasi-equilibrium theory for the formation of COOH+ while it seems to be statistical for the formation of CH3CO+. we re-run a fresh dilution with UV-water ... and got some nicer fragments... but unstable turbo spray signal. Is Elastigirl's body shape her natural shape, or did she choose it? Have any GDPR (or other) laws been breached during this scenario? : Conf. Are my scuba fins likely to be acceptable "personal items" for air travel? What is the danger of creating micrometeorite clouds orbiting the Moon by constantly landing spacecrafts on its surface? ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. Fragmentation pathways of acetic acid upon adsorption on Si(1 0 0)2 × 1. Mass spectrometry: trouble with acetic acid fragmentation. Asking for help, clarification, or responding to other answers. Have you run a blank to ensure you are not just measuring some other random compound; Or contaminants from the instrument; Or gas system. Is too much sample being injected in the instrument as you do measure different fragment patterns when a lot of sample is injected as the molecular ion may be a charge bound cluster (similar to what is seen in ESI). If it is a water injection into a GCMS, not only are you destroying your column but the solvent will expand in the injection port and goes back into your gas system as water has a very high expansion when going from liquid to gas. Ask Question Asked 6 years, 9 months ago. Electron transfer induced fragmentation of acetic acid View the table of contents for this issue, or go to the journal homepage for more 2014 J. Chromatograms and fragmentation pattern obtained for indole-3-acetic acid by LC-MS/MS. Chemistry Stack Exchange is a question and answer site for scientists, academics, teachers, and students in the field of chemistry. I'm trying to do compound optimization for acetic acid on a EI-MS. Why were the Allies so much better cryptanalysts? site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. What's the difference between mass spectrometry, mass spectroscopy, and mass spectrography? Present address: Department of Chemistry, Brown University, Providence, RI 02912, USA. It only takes a minute to sign up. Is there a reason to not grate cheese ahead of time? Phys. The bidentate structure may bend asymmetrically towards the surface into transition state TS5 , which also displays a shortening of one of the Si–O bonds to 1.583 Å. How do I prevent myself from freezing up during a game I'm DMing? The origin of kinetic energy release accompanying the formation of these two ions is discussed. Later on it would be also run via HPLC to the MS. MathJax reference. To describe an invariant trivector in dimension 8 geometrically, We work with ESI, also tried it with APCI, Acetic acid as a liquid, with mobile phase of water and formic acid, in the meantime we did a blank (thanks for the suggestion!) Is the acetic acid reacting with anything in the sample introduction path which is giving another compound? Acetic acid may undergo a further fragmentation on the silicon surface. By continuing you agree to the use of cookies. By continuing you agree to the use of cookies. and we also got the 32 fragment... but non at 60/61 (for positiv mode) I'm creating an App, which country's law will be applied to it? Did Rashi's father really get that reward? Why is a link in an email more dangerous than a link from a web search? Viewed 2k times -1 $\begingroup$ I'm trying to do compound optimization for acetic acid on a EI-MS. Later on it would be also run via HPLC to the MS. Present address: Tsukuba Research Laboratories, The Upjohn Company, 23 Wadai Tsukuba-City, Ibaraki 300-42, Japan. But I do only get fragments of 53/54 and 32. Figure S1. Mass spectrometry: trouble with acetic acid fragmentation, MAINTENANCE WARNING: Possible downtime early morning Dec 2/4/9 UTC (8:30PM…, “Question closed” notifications experiment results and graduation. Forecasting Prices vs Returns by Deep Learning. We use cookies to help provide and enhance our service and tailor content and ads. Are you sure, really, really sure you are using acetic acid and not something else? In the first one, the cleavage of the hydroxylic bond is followed by a number of migrations of the dissociated hydrogen as well as structural rearrangements that eventually lead to the incorporation of an oxygen atom into the silicon surface, with a Si–O–Si structure.

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