- by /u/Thunder_Ashhsubmitted by /u/Thunder_Ashh [link] [comments]
- by /u/Apacukafundaluka12Question: Hello everyone, I’m trying to calculate the iron content in a pharmaceutical tablet using UV-Vis spectrophotometry. One tablet is supposed to contain 100 mg of iron, and I need to confirm this value through calculations. Experimental Details: Calibration curve: y=222833x−0.0048 (where y is absorbance and x is iron concentration in mol/L). Preparation: I dissolved 33.5 mg of the tablet in 100 mL of water. From this solution, I took 15 mL, diluted it to 25 mL, and measured the absorbance. I added 0.055 mg/L of iron standard to the solution for the standard addition measurements. Absorbance values: Without standard […]
- by /u/Legitimate_Crazy_159Hi, anyone knows how to measure manually split ratio on older models GC/FID? I know i want to use a sample containing unretained components like methane or air, someone suggested just to inject lighter fluid and then do math based on the dimensions of the column, but the butane evaporates so quickly that i cannot adequately inject it. Anyone has any other ideas for the sample that i can use to measure the linear flow velocity (and subsequently split ratio)? submitted by /u/Legitimate_Crazy_159 [link] [comments]
- by /u/Aggressive_Bit_8827Hi all, I don't know if these kinds of career questions are welcome here, but I'll shoot it off anyways. I'm an undergraduate considering analytical chemistry as a career. I'm taking my quantitative analysis course and am really enjoying it. In addition, I've recently gotten a lab technician job doing a lot of GC stuff and so far its going great. However, as well as chemistry, I also love math. I'd hate to never see calculus again if I go on to (try to) be an analytical chemist (either as a professor or MS/PhD-level work in industry). From my QA […]
- by /u/Ok_Cheesecake_8746Hello! I am taking the Analytical ACS Exam next week for my class's final examination. We are allowed one note card, front and back. Could you advise me on what is 100% going to be wanted for the note card? It can have anything I want on it. If you have any other advice, that would be much appreciated. Sorry for any bad English, thank you! submitted by /u/Ok_Cheesecake_8746 [link] [comments]
- by /u/Ok_Routine_4938We are identifying chiral impurities through the SFC. Method is pre developed we are just validating the method, but we are facing serious issues with this method even after washing the column properly for couple of the days. Issue: 1) not proper peak for std and sample. 2) Too much noise in baseline and even in blank. 3) not consistent with results. Anybody has suggestion like how we can prepare the instruments, what things need to make sure when using SFC. submitted by /u/Ok_Routine_4938 [link] [comments]
- by /u/beavmaneI want to prepare a sample diluent for an ISE module Hello, I want to prepare a sample diluent for my ISE module to analyse Na, K and Cl in the plasma using indirect potentiometry method, but I don't have too much knowledge about chemistry and specifically buffers . I don't have the composition of the original sample diluent, I only know that it contains triethanolamine as a compound and has a pH around 7.7, density of 1.016, and I think that it has a very low ionic strength. I don't have triethanolamine, so I tried to prepare it with […]
- by /u/WaviLabHas anyone made the transition from a triple quad LCMSMS to an Orbitrap for non-targeted PFAs testing? I plan to open a PFAs testing lab in the next year. Any advice or suggestions? The number of compounds an orbitrap can test for makes it a very lucrative investment for PFAs labs. I have multiple orbitraps & will probably only use 1-2 in my lab. If anyone is in the market for an orbi, I can supply one for $40k-50k under market price. I hate these companies that rip scientists off with huge markups. submitted by /u/WaviLab [link] [comments]
- by /u/Pleasant_Chef_8870submitted by /u/Pleasant_Chef_8870 [link] [comments]
- by /u/Planet-Xera-9783Hello! I recently started working with nanoemulsions and was wondering if anyone had any advice on sample preparation. The emulsions were sonicated previously and a 1 in 100 dilution was made with the emulsion and buffer solution for measuring particle size. I am quite reluctant to filter the solution as it will remove some of the important particles from my sample. The zetasizer is showing that my samples have an average diameter size of 1430nm but it only shows a peak ranging from 300-400nm which is more in line with what is expected. The expert advice column says that my […]
- by /u/Coiler93Is there anyone who can give me some suggestions on how to set up an analysis of essential oils (extracts from Lavandula, Lemon, Rosmarinus) with my Agilent 8860 GC (split-splitless injector, FID detector), He carrier, dichloromethane solvent used. I don't have the possibility to use internal standards so it would only be a qualitative analysis of the peaks (I don't even have access to databases so I ask if there is the possibility of finding something open access). Let me explain, it's for an exercise in a school. Thank you in advance. submitted by /u/Coiler93 [link] [comments]
- by /u/Ghidaaelawadi11How can I prove that the prepared nanoparticle has native fluorescence or Raleigh scattering Note: excitation was 242nm and emission at 485nm And this fluorescence was calibrated quenched by the drug. submitted by /u/Ghidaaelawadi11 [link] [comments]
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