Atomic Absorption Spectroscopy/Atomic Absorption Spectrometry/AAS 

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Thanks for your compliments. I don't find enough time. I do this in my free time. Even I want to make many videos. I will do my best. In this pandemic even our work load has multiplied.

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For Li is only it is 621nm. for Ca it is 423nm. I will check whether I told by mistake..

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By using flame photometry we can analyse only alkali and alkaline earth metals, but using AAS we can analyse plenty of metals in addition to the above metals.. One single light source cannot be used to analyse all metals. There are many other sources to analyse specific metals. In flame photometry the is no light source for the metal ion to absorb energy and get excited. In AAS, light passes through the flame and hence the metals ions absorbs light and get excited. Flame is used to evaporate the solvent and nebulise.

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In AAS, the light absorbed only is taken into consideration, not the light emitted.

Hi! After reading your comment, I started to questioning it too, and confused. I know it's been 3 years, but have you found a satisfying answer to this question?

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What are the types of AAS? What does ICP-OES measures? ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-il8gCHjKPVo.html

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Lens may be used. Here we are showing the basic instrumentation, not the detailed one. It will be very complicated, not as simple as you seeing. This is just for you to understand the basics of AAS.

Enough for exam.

It may. Depends on the question paper setter.

Incident light is from hollow cathode tube or any other source used.

@@RevathiPurushothaman and Ma'am how it is measured to get the transmittance?

Instrumental techniques by Willard, Dean and Settle, Analytical Chemistry by Gary Christian.

Where does cathode and anode come into picture in AAS?

Hollow cathode lamp

For activating the rest of the atoms under investigation which were under ground state at the flame region a specific wavelength of light is required. So in order to get the exactly required wavelength of radition the cathod needs tobe coated with the same analyte.