- by /u/Apacukafundaluka12submitted by /u/Apacukafundaluka12 [link] [comments]
- by /u/Clear-Emu-347submitted by /u/Clear-Emu-347 [link] [comments]
- by /u/Apacukafundaluka12Hi, Does anyone have experience with the WPA Lightwave II+ UV-Vis spectrophotometer? I am measuring full absorption spectra (e.g. 400–700 nm) and I would like to export the complete spectrum data (λ vs absorbance). Is it possible to save or export the spectrum directly from the instrument (e.g. via USB or software), or does it need to be transferred to a computer in a specific way? If export is not available, what is the recommended way to properly record the spectrum for publication purposes? Thanks in advance! submitted by /u/Apacukafundaluka12 [link] [comments]
- by /u/horrorbiologistsubmitted by /u/horrorbiologist [link] [comments]
- by /u/Apacukafundaluka12I’m preparing water samples for analysis. The samples are acidified for preservation, but before the actual measurement the pH needs to be adjusted back to around pH 4–5. In practice, how is this usually done? Is it simply a matter of adding a base (e.g. NaOH) dropwise while monitoring the pH with a pH meter (or indicator paper) until the target pH is reached, or is there a more recommended or standardized approach? Any practical tips would be appreciated. submitted by /u/Apacukafundaluka12 [link] [comments]
- by /u/Many-Floor-5752Hi all, I’m a first year chemistry masters student. I had decided to orient towards organic and analytical, and due to some experience in an analytical lab (despite it just being prepping samples for ICP’s) I decided to dive slightly more into analytical, especially laboratory exercise wise. I’m having my first advanced analytical exercise soon and while doing the prelabs I bumped into something I had blissfully ignored for so long while happily drawing away in the advanced organic – I suck at math. I was tested by my request in maths to check if I fall into the dyscalculic […]
- by /u/Necessary-Success888Hi everyone, I’m having a strange issue with a HS-GC-MS method for VOC analysis and I’m hoping someone can help me. I run calibration and QC/control standards regularly. Right after calibration, the QC passes and most compounds quantify very close to the expected values. However, after running a batch of samples, some analytes in the QC start to quantify at about ~50% lower than expected. Important details: Technique: HS-GC-MS (VOCs) All analytes come from the same mixed standard solution Same preparation, same vial type, same method The problem affects mainly higher boiling / less volatile compounds, e.g.: xylenes styrene 1-methylnaphthalene […]
- by /u/Ill-Information-893Hi everyone, Does anyone know where I can buy these plug-in / push-fit plastic tubing reducer connectors for the argon supply to the nebulizer on an ICP-OES? I’m looking for the small plastic connectors used to adapt tubing sizes between the argon line and the nebulizer. Any suppliers, part numbers, or alternative fittings that work well would be appreciated (excluding official submitted by /u/Ill-Information-893 [link] [comments]
- by /u/Ill-Information-893Hi everyone, Does anyone know where I can buy these plug-in / push-fit plastic tubing reducer connectors for the argon supply to the nebulizer on an ICP-OES? I’m looking for the small plastic connectors used to connect the argon line to the nebulizer. Any suppliers, part numbers, or alternative fittings that work well would be appreciated (excluding the equipment supplier wich charge a leg for this piece of plastic). Thanks! submitted by /u/Ill-Information-893 [link] [comments]
- by /u/realshootingstarI just started a PhD in analytical chemistry, but my background is a bit different (not pure chemistry but archaeometry). I'm a bit lost when it comes to some laboratory skills, especially in sample preparation. Compared to some of my colleagues, who graduated from pure chemistry degrees, I feel like a noob. I know that I will gain most of these skills with time, but I'm getting a bit tired of looking like a fool every time I have to prepare a solution. Does anyone know if there's some good manuals/books which collect all the information about basic skills in […]
- by /u/Apacukafundaluka12Hi, I’m sending samples to an external lab for the first time. I already measured them using my own method, and I also verified the results with standard addition, which worked well (good linearity, reasonable RSD). My question: Is it still possible that the external lab reports different concentrations? I assume they may use a different technique or determine total concentration vs. a specific species, but I’m not sure what level of difference is considered “normal”. Is this common in practice? How do you usually explain or handle such discrepancies? I worked carefully and honestly, but I’d appreciate hearing about […]
- by /u/Hot_Aide_6877I’m feeling sort of lost in my career right now. I am 18 months into a position as an R&D Analyst, mainly HPLC in pharma so very GMP too. I enjoy it for the most part but I thought this was my dream career/job. it felt like I hit the jackpot when I got it after 13 months in a CRO doing similar work. I feel so fresh into my career but I’m not really enjoying it, I don’t feel like I love it. I am considering moving jobs, not sure if I should look at internal positions or move […]
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