Really thank you sir, for talking about your own experiences ! I think these arguments are better than theory sometimes !
@mrphysh8 жыл бұрын
+Alessio Giovinazzo Thanks for the comment. Sometimes I think I can only learn as a result of self exploration. This is a little humiliating as an educator.
@AlessioGiovinazzo8 жыл бұрын
I think Einstein knew the answer. "Theory is when you know everything but nothing works. Practice is when everything works but no one knows why. In every case, theory and practice are combined: nothing works and no one knows why"
@mrphysh8 жыл бұрын
Quick comment. This is, of course, a gas chromatography application. The GC run time is short, less than five minutes for ethanol. I do not think that there was a temperature ramp.
@saraarceo99278 жыл бұрын
Qué bien está la explicación. Hablas claramente y se traduce muy bien. Gracias. Saludos desde México.
@mrphysh12 жыл бұрын
Upon rereading your comment, it occurs to me that you may not want to blend the samples. The volatiles will leave the sample during the blending step. Think about what you are looking for and look at its physical characteristics, (boiling point) You do not need a big sample; 100-1000ul...............
@mrphysh11 жыл бұрын
If I was facing this I would find a reference and follow the reference. A general answer would be to make a standard at 2000ppm, mixed with all four compounds. Or buy one already made. And use the internal standard specified by the reference. Juliet, I guess the short answer is to ask someone else.
@mrphysh12 жыл бұрын
I make videos on areas that are not flooded with videos. For differential equations, go to KahnAcademy. He does a great job. Thanks for the comment........
@AA-gl1dr4 жыл бұрын
Phenomenal video thank you!
@mrphysh4 жыл бұрын
thanks
@mrphysh12 жыл бұрын
Trust your intuition. I assume that you are doing this manually. Be aware of carry-over with the syringe.
@asheonsneak8563 жыл бұрын
Great explaination
@mrphysh3 жыл бұрын
thanks!
@EpitaphNoeeki12 жыл бұрын
Thanks a lot for this video! I´m currently working on a school project about forensic chemistry, and this helped me quite a lot. (Blood alkohol analysis). A shame that there is nothing to find in my native language (german).
@Stas2011video5 жыл бұрын
Dear mrphysh! Can I ask you about headspace? If I have one vial with headspace 4 ml (total volume 20 ml) and second vial with headspace 4 ml (total volume 200 ml) - will concentrations in 2nd vial headspace be 10 times more than in 1st vial headspace? Thank you
@mrphysh5 жыл бұрын
What are you trying to achieve. what is your objective? Your question makes no sense and is of no interest to me.
@Stas2011video5 жыл бұрын
@@mrphysh thanks for your answer. I just want to increase gases concentrations.
@mrphysh6 жыл бұрын
go around and around it in your head. You need to really understand it. The whole idea of analysis is that everything (but one) is the same, standard to control to sample.
@RikiNanno12 жыл бұрын
When preparing sample aliquots, do you need to filter them after blending before putting it into the test tube and heating? I would think small particles would not matter since gas is taken instead of solution. Please advise
@pharmadrive5234 жыл бұрын
Thankyou sir
@mrphysh4 жыл бұрын
The GC run is only about 5 minutes. There is no temperature ramp; ... no cool down delay.
@carlag076 жыл бұрын
hello, how to do calibration if the sample is on gas?and how much volume that we need to inject manually to the gc FId HP5. and how about the method if our sample is on gas not liquid?
@mrphysh5 жыл бұрын
watch the video over and over. It will be worth your time.
@Mercento3 жыл бұрын
Can it be used for quantitative analysis?
@mrphysh3 жыл бұрын
Yes. The foundation for analysis is always "keep everything the same" That way the response for the standards can be used to calculate the unknown.
@mrphysh8 жыл бұрын
De nada
@ramachandram46455 жыл бұрын
Sir why dose headspace
@julietokoli990111 жыл бұрын
@Mrphysh, can you tell me how l can prepare my stock, am analysing BTEX in water?