- by /u/GuyknubzNow I’m a third years chemistry major student. I’m taking some courses of master’s degree. Please recommend some textbooks that deeply teach on Sample preparation for chemical analysis, such as calibration curves comparisons, mass transfers, QuEChERS, micro-extraction, and etc. (principles of Instrumental analysis by skoog doesn’t have these) submitted by /u/Guyknubz [link] [comments]
- by /u/Coiler93In the school where I work I have a Varian 5000 Vista Series HPLC system, and since it is still working, I kindly ask if there is a possibility of finding the manual for the system. Thanks in advance (I also write to Agilent but maybe someone here can also have it or tell me where can i find it). submitted by /u/Coiler93 [link] [comments]
- by /u/thepatterninchaosSomeone wants me to round to whole numbers. I just want to use what OpenLab CDS gave out! 3 d.p. – We can round at the final stage after calcs! submitted by /u/thepatterninchaos [link] [comments]
- by /u/Significant_Share_69I used to submitted by /u/Significant_Share_69 [link] [comments]
- by /u/player-1-Hello, If anyone have any experience in this, could you please help? We have three different methods for a tablet containing oxfendazol and oxyclozanide; 1-both API's assay 2- oxfendazol related substances 3- oxyclozanide related substances. Is there any way to analyse all of it in one injection? All examples and information is appreciated! Thanks in advance fellow qc'ers submitted by /u/player-1- [link] [comments]
- by /u/Downtown_Entry_893Hello so I am taking this course in University and have no idea and understanding of the topic of complex when ph starts appearing in questions. submitted by /u/Downtown_Entry_893 [link] [comments]
- by /u/soup97submitted by /u/soup97 [link] [comments]
- by /u/Beowulf_98Recently started a new role as an analytical chemist and have had a problem when weighing accurately to 5dp. We "weigh by difference" and whenever I've put the weighing boat back onto the balance, the weight just keeps going down and down. At what point do you just record the weight? I've tried waiting for 3 seconds to see if it settles but by the time I look back at the balance, it's gone down by 0.00003 g. If I record the first settled weight, it might be 0.10050 g but if I wait it could go down to 0.10027 […]
- by /u/EpictppCan anyone explain to me the difference between the mobile phase used in a HPLC lines and the solvent used to make up HPLC samples. Why are they different? submitted by /u/Epictpp [link] [comments]
- by /u/Ok_Routine_4938As a analytical scientist I am using dissolution apparatus quite often and auto filteration as well. Problem that I am quite frequently facing is auto filtration unit is not working well in Distek Disso (apparatus type 2)Anyone has the same kind of problem. Can anyone suggest best dissolution apparatus type and brand plus model name in terms of more robust. submitted by /u/Ok_Routine_4938 [link] [comments]
- by /u/Eleo_Hello everyone (especially those from EU), we need to change the supplier for gc-ms and hplc-ms solvents since they our old supplier doesn't serve our area anymore. We found that we could buy PanReac solvents from IWT and they seem less expensive than Merck. Since I never heard of this brand I would like to know if someone has used it and how is the quality compared to VWR or Merck. Thank you! submitted by /u/Eleo_ [link] [comments]
- by /u/Coiler93I forgot how to prepare the solution of 2,4 DNPH could anyone help me? Actually I tried with 3 g of DNPH powder with concentrate sulfuric acid (15 ml) (ice bath and continuos stirring) then I added Ethanol 98° + deionized water (70:20) but it forms a bright orange precipitate (tried also with a filtration but the yellow solution obtained don't react with aldehydes. submitted by /u/Coiler93 [link] [comments]
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