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VCE Chemistry Question Thread
Billuminati:
--- Quote from: Chocolatepistachio on June 14, 2022, 07:43:25 pm ---Can someone explain the process of atomic absorption spectroscopy and
explain why separation of the ions is not required when analysing by AAS
--- End quote ---
AAS involves a lamp containing the element you want to quantify emitting light of the same wavelength of absorption as your sample, this light source is shined onto a high temperature burner which converts the element of interest in your sample into gaseous, ground state atoms which can absorb this electromagnetic radiation. This absorbance is detected by computers, but not before being wavelength-restricted to the intended wavelength by a monochromator to increase signal:noise ratio. You don't need to separate the species since each ion absorbs a specific wavelength of electromagnetic radiation so there's rarely any interference between 2 different analytes which may cause overestimation of concentration. It's thanks to the fact that all e- transitions are quantised so each transition in different species is represented by a very specific spectral line. Remember that ions are NOT appropriate for AAS since ions have different spectral lines to ground state atoms. You can still analyse ion concentrations in a solution with AAS but they have to be converted to ground state atoms by the burner
ThomasK12:
Heyy,
If someone has the 2015 TSSM organic chemistry (polymers) key topic test can u plss send??
Thankss
Chocolatepistachio:
Can someone explain the standard addition method and the difference between the standard addition method and use of a calibration curve and calibration standards
Chocolatepistachio:
What are the disadvantages of step wise elution over other elution methods
beep boop :
Hi All,
Can someone please help me w/ q13 c and q15d?
Much appreciated,
beep boop
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