- by /u/WesternNational4283submitted by /u/WesternNational4283 [link] [comments]
- by /u/grubbscatsubmitted by /u/grubbscat [link] [comments]
- by /u/grubbscatsubmitted by /u/grubbscat [link] [comments]
- by /u/itsZuanshiWe have two isolated lab spaces and currently run PT/GC/MS, ICP-MS, and IC. We’re considering adding an LC-MS/MS for PFAS testing (EPA 533 and 537.1). I have a few questions: Does the LC-MS/MS need to be completely isolated from the other instruments? Could wires from our server or other electronics cause contamination? Is it okay to keep the GC-MS in the same room? Are there any other precautions we should take when setting this up? Thanks in advance for any advice! submitted by /u/itsZuanshi [link] [comments]
- by /u/Remote_Section2313i'm working in food analysis and we're trying to set up some titrations in vegetable oils and fat. For most samples, we have no issues, but we need a method for fat analysis in cocoa beans, which means we have to extract the butter from the beans. Does anybody have experience with this on a lab scale? So far, what we can test: -chemical extraction (adding hexane to the powdered beans, mixing, filtering and evaporating the solvent) -mechanical: pressing the beans with a manual press (or electric or hydraulic, I guess), through a fine filter. submitted by /u/Remote_Section2313 [link] [comments]
- by /u/Ok_Result6108A sample with an estimated content of 55% Fe, 3% Al and 1.4% Ni was analyzed using a method, that is considered linear when the concentration range of Ni is 100 … 500 мg/L. 0.1647 g of sample was weighed and dissolved in 10 ml of 6M HCl. The solution was then transferred to a 100 ml volumetric flask and the flask was filled to the mark. The solution must be diluted for the further analysis. How much of the sample solution, prepared as described above, should be pipetted to a 25 ml flask for the estimated Ni concentration inthe […]
- by /u/Pure-Country-6632I am so lost in my analytical chem lecture, if someone knows how to do an f-test, t-test, or q-test please explain it to me in the most basic terms possible 😭 submitted by /u/Pure-Country-6632 [link] [comments]
- by /u/Training-Resist-2745Hi everyone, We’re running LC-MS on samples with a fairly high salt burden. On C18, this hasn’t been an issue since we divert the injection peak to waste, preventing salt buildup in the MS. Now, since we’re also interested in more polar analytes, we’re considering HILIC as an additional separation mode. What’s less clear to me is how inorganic ions (Na⁺, Cl⁻, SO₄²⁻, Mg²⁺, Ca²⁺, etc.) behave in HILIC. From my understanding, they might be among the last species to elute – but we’d definitely like to avoid sending them into the MS. Has anyone dealt with this in practice? […]
- by /u/Direct-Razzmatazz973submitted by /u/Direct-Razzmatazz973 [link] [comments]
- by /u/Available_Floor8686Hi everyone, We’ve been dealing with an ignition issue on our SPECTRO ARCOS ICP-OES for over a year now, and we're hoping someone here might have insight or experience with a similar problem. The instrument fails to ignite consistently. After comparing the log files between when it was working and now, we noticed two key differences: HVPSCurrent (High Voltage Power Supply Current, in mA): When working: Ramps up to around 300 mA Now: Stays near 0 mA GenImp (Generator Impulse? — not sure of the exact unit): When working: Around 3000 throughout Now: Starts at 0, then spikes to around […]
- by /u/equeriquiacoliHello guys! I was wondering if you guys could help with this topic. I work at a Pharmaceutical company and on of the methods we perform is retorne quantification by GC-FID. We do the quantification using a calibration curve with and Internal standard. As we have a lot of compounds and the calibrationhas several points we inject the curve once and use the data throughout a month. Always veryfing with be standard that the response factor stays the same. Is this a good approach? What do you suggest? I hope I explained everything correctly. Thanks submitted by /u/equeriquiacoli [link] [comments]
- by /u/ReceptionSad8303Hi, im a student and i need help with an assignment i have. My profesor gave me a coin and I need to determine its composition via volumetric, gravimetric or spectrometric analytical methods (that can be replicable in a lab). I would really appreciate if you could give me some info or maybe books that i can use for this assignment. My coin is a 1981 100 pesos coin from argentina, based on information online it is composed of brass coated steel, but its pretty old. (https://es.numista.com/catalogue/pieces8117.html) Here is the full assignment (https://docs.google.com/document/d/1D3fJlVgNzO0ST2\_He3UD08EBOwyU-Ikhoh1OX\_yqokg/edit?tab=t.0) submitted by /u/ReceptionSad8303 [link] [comments]
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