awesome explanation... and i m amazed by your mirror writing skills... and i can't resist myself to give a feedback... again nice explanation thanks a lot...
This video was well conceptualized and presented. The information provided and the methodology utilized was successful in converting me from a Dummy in AAS to an informed student.
brilliant video! when learning about the absorption spectroscopy we were told that we dont need to know how the AAS works for our final exams but i really needed to know how it worked in order to learn what it can be used for. this video was very informative, thanks!
PERFECTION! this helped me out so much brother i have a test tmr hahah regarding volumetric analysis, chromatography and spectroscopy as well. thanks so much keep up the great work. easy like and sub for me
Excellent video! I appreciate your effort in teaching the principles of Atomic Absorption Spectroscopy. Although, I do have a question about the wavelength absorbance in different elements. How can one calculate the wavelength needed to have a maximum absorbance?
Whilst I understand that some of the light of the correct wavelength is absorbed by the atoms in the flame and putting them in an excited state, but what's to stop the electrons in these excited states from dropping down to their ground state and emit light (photons) of the same wavelength ? In emission spectroscopy, the atoms are excited in a high temp plasma which initially push electrons to higher states and when they return to their ground states, they emit photons of specific wavelengths to give a line emission spectrum. Or have i misunderstood? Thanks
Great video but I would have a question. What kind of samples can be measured (metals in organic/inorganic fluids etc.) And how is this diffferent than a Graphite AAS?
Hi Oky, sorry I didn't see this earlier. It depends on the AAS machine you use as to what you can sample. I have just tried to give a basic overall explanation that fits any AAS machine. As long as the fluid that the metal is in can be vaporised, it can be detected. A graphite AAS follows exactly the same principles, except that instead of a flame to vaporise the sample, it uses a small graphite tube that you place the sample in and then heat to vaporise it instead. Otherwise, same process. Hope this helps and thanks for commenting.
Thanks so much for the video! I know this is very late but I have a question - what is the purpose of the flame? Why can't you simply spray the metal solution in the air? Wouldn't the energy from the flame interfere with the amount of energy absorbed? Thanks so much again!
The purpose of the flame is to vapourise the sample. The flame evaporates off the solvent that the sample is in, and it doesn't interfere with the energy absorbed as it is not the specific wavelength of the atoms in the sample, so is not absorbed by the atoms. Hope this makes sense?
I have 2 questions. 1 Does the sample you measure get in an exited state and emit light and so who can you correct it? How can the emission wavelength be the same as the absorption what about stokes shift?
I'm no expert but I think what happens is that the light gets absorbed and that is what you are measuring. The light that gets re-emitted when the atom goes back to ground state goes off in a random direction and never hits the detector.
Hi Sander, sorry I didnt see this comment earlier. This is heading into Physics territory which is not my strength sorry, but as I understand it (and could be completely wrong!) is that each element absorbs and emits unique wavelengths of light that do not have to be the same wavelength as each other. It is just that it is unique to that element, which is why the shift between the wavelength of emission and absorption (stokes shift) can still be accounted for. Hope this makes sense and hope I have explained it correctly.
That is true, you are only measuring the percentage of light that makes it through the sample. However I think Sander was asking about how the wavelength emitted from the lamp is absorbed by the sample when they could be different wavelengths (as he mentions with regards to stokes shift) where the emitted light is actually a higher wavelength.
Hey Ibad. The atomiser used depends on the spectromer used, but basically is just a flame where a liquid version of the sample is sprayed into (turning it into the atomised form). The monochromator is used to select the specific wavelength of light that corresponds to the hollow cathode lamp used, and the detector determines the percentage of light that has passed through the sample (the lower the reading, the more light was absorbed and the higher the concentration of the sample being tested). Hope this helps, and glad you liked the video!
Hi Cam, the HCL emits light of a specific unique wavelength for that element. As the sample in the flame has the same element, that will absorb this unique wavelength. If you use any element other than the one you are testing for, it will not emit the right wavelength for the sample to absorb. Hope this makes sense!
Really love your explaination and each word was said very loud and clear. Really need it before my exam. Thanks Bill
Glad it was helpful!
awesome explanation... and i m amazed by your mirror writing skills... and i can't resist myself to give a feedback... again nice explanation thanks a lot...
Thanks Kartik, glad you liked it.
This explanation was pure gold, thankyou so much sir!
Thank you very much 😀👍 This was explained excellently! Much appreciated.
This video was well conceptualized and presented. The information provided and the methodology utilized was successful in converting me from a Dummy in AAS to an informed student.
brilliant video! when learning about the absorption spectroscopy we were told that we dont need to know how the AAS works for our final exams but i really needed to know how it worked in order to learn what it can be used for. this video was very informative, thanks!
I have to give you feedback!🤩🥳🥰
Beautiful way of teaching. Thank you for that ! excellent !
Best explanation i have seen, thank you so much for the video.
Great explanation!
Thank you very much for your efforts!
Amazing 🤩I finally found the explanation I was looking for!Thanks a lot!
manam hamintor..kheili komak kard:))
This is the best explanation ever......good work
Dear Sir, Thank you very much for this awesome explanation got everything in one shot. Thank you again
Best description ever... thanks thanks thanks
Love it!
Brilliant!
Excellent!! Thanks
Amazing thank you so much
Thank you awesome explanation
This is a great video..
Thank you Sir! I appreciate that
PERFECTION! this helped me out so much brother i have a test tmr hahah regarding volumetric analysis, chromatography and spectroscopy as well. thanks so much keep up the great work. easy like and sub for me
Nice explanation!!
!wow very good explanation! Wish my teachers would have the same capacity
Thank you so much this is so easy to understand greetings from Indonesia !!
You're very welcome!
Awesome!!!¡ thank you very much!
thank you!!!
well done sir thank you very much
awesome. thnQ
Thanks a lot!
You're welcome!
Very interesting
Mirror writing skills = mindblowing !
thank you so much sir,you really help me
Woooow ur such a wonderful teacher
Thank you! 😃
Good teaching..
Briliant Sir.
Please explain the Data Domain Map of AAS!
🔥 😮
Excellent video! I appreciate your effort in teaching the principles of Atomic Absorption Spectroscopy. Although, I do have a question about the wavelength absorbance in different elements. How can one calculate the wavelength needed to have a maximum absorbance?
Whilst I understand that some of the light of the correct wavelength is absorbed by the atoms in the flame and putting them in an excited state, but what's to stop the electrons in these excited states from dropping down to their ground state and emit light (photons) of the same wavelength ? In emission spectroscopy, the atoms are excited in a high temp plasma which initially push electrons to higher states and when they return to their ground states, they emit photons of specific wavelengths to give a line emission spectrum. Or have i misunderstood? Thanks
Great video but I would have a question. What kind of samples can be measured (metals in organic/inorganic fluids etc.) And how is this diffferent than a Graphite AAS?
Hi Oky, sorry I didn't see this earlier. It depends on the AAS machine you use as to what you can sample. I have just tried to give a basic overall explanation that fits any AAS machine. As long as the fluid that the metal is in can be vaporised, it can be detected. A graphite AAS follows exactly the same principles, except that instead of a flame to vaporise the sample, it uses a small graphite tube that you place the sample in and then heat to vaporise it instead. Otherwise, same process. Hope this helps and thanks for commenting.
and thank you sir
Thanks so much for the video! I know this is very late but I have a question - what is the purpose of the flame? Why can't you simply spray the metal solution in the air? Wouldn't the energy from the flame interfere with the amount of energy absorbed? Thanks so much again!
The purpose of the flame is to vapourise the sample. The flame evaporates off the solvent that the sample is in, and it doesn't interfere with the energy absorbed as it is not the specific wavelength of the atoms in the sample, so is not absorbed by the atoms. Hope this makes sense?
@@billstapleton2071 Ok that makes sense! Thanks so much for the reply.
Thnk u so much fr dis video... it really helped me... n d mirror ur using as blackboard is 👍🏻...
Why we need to burn the sample?
wow
Okay
I have 2 questions. 1 Does the sample you measure get in an exited state and emit light and so who can you correct it?
How can the emission wavelength be the same as the absorption what about stokes shift?
I'm no expert but I think what happens is that the light gets absorbed and that is what you are measuring. The light that gets re-emitted when the atom goes back to ground state goes off in a random direction and never hits the detector.
Hi Sander, sorry I didnt see this comment earlier. This is heading into Physics territory which is not my strength sorry, but as I understand it (and could be completely wrong!) is that each element absorbs and emits unique wavelengths of light that do not have to be the same wavelength as each other. It is just that it is unique to that element, which is why the shift between the wavelength of emission and absorption (stokes shift) can still be accounted for. Hope this makes sense and hope I have explained it correctly.
That is true, you are only measuring the percentage of light that makes it through the sample. However I think Sander was asking about how the wavelength emitted from the lamp is absorbed by the sample when they could be different wavelengths (as he mentions with regards to stokes shift) where the emitted light is actually a higher wavelength.
what is the automizer burner here and also what is the function of monochromater and detector
Hey Ibad. The atomiser used depends on the spectromer used, but basically is just a flame where a liquid version of the sample is sprayed into (turning it into the atomised form). The monochromator is used to select the specific wavelength of light that corresponds to the hollow cathode lamp used, and the detector determines the percentage of light that has passed through the sample (the lower the reading, the more light was absorbed and the higher the concentration of the sample being tested). Hope this helps, and glad you liked the video!
okay
Ok
How can he write backwards?
ok
Why should the HCL use the same element as the sample you are trying to identify?
Hi Cam, the HCL emits light of a specific unique wavelength for that element. As the sample in the flame has the same element, that will absorb this unique wavelength. If you use any element other than the one you are testing for, it will not emit the right wavelength for the sample to absorb.
Hope this makes sense!
@@billstapleton2071 that does make sense, thank you so much!
Can he write letters backwards?????
how do you write like that
Lol, it’s actually just that I write normally and flip the video in editing, I am actually right handed.
@@billstapleton2071 oh i see, great video
How the fuck is he able to write like this? hahaha
ok