Atomic absorption spectrophotometry, Chemistry

Assignment Help:

Atomic absorption spectrophotometry:

Atomic absorption spectrophotometry (AAS) concerns the absorption of radiation by the atomised analyte element in the ground state. The atomisation is achieved through the thermal energy of the flame or electrothermally within an electrical furnace. The wavelength(s) of the radiation absorbed and the extent of the absorption form the basis of the qualitative and quantitative determinations respectively. As atomic absorption spectrophotometry is not an absolute method of analysis, the routine analytical methodology for quantitative determinations using AAS is based on calibration method. Besides that the internal standard method and standard addition methods are also employed.

A typical atomic absorption spectrophotometer consists of a source delivering the characteristic resonant radiation of the analyte, an atom reservoir into which the analyte is introduced and atomised, a monochromator, a detector and a readout device. In a typical flame atomic absorption spectrophotometric determination, the radiation from a hollow cathode lamp (or electrodeless discharge lamp) is made to fall on the sample of the analyte aspirated within the flame (or in the cuvette of an L'vov graphite furnace), while a part of it is absorbed. A transmitted radiation is then dispersed through a monochromator and sent to the detector. The detector output is suitably processed and is displayed by appropriate readout device. Like, UV-VIS spectrophotometers the atomic absorption spectrophotometers are also of two types' viz., single beam atomic absorption spectrophotometers and double beam atomic absorption spectrophotometers.


Related Discussions:- Atomic absorption spectrophotometry

Distillation, Ask question #Minimum 100oo words

Ask question #Minimum 100oo words

Nacl is dissolved in water the sodium ion, When  Nacl  is dissolved in wat...

When  Nacl  is dissolved in water the sodium ion becomes: (1) Oxidized                                       (2) Reduced   (3) Hydrolysed           (4) Hydr

The energy of a radiation of wavelength, The energy of a radiation of wavel...

The energy of a radiation of wavelength 8000 Å is E 1  and energy of a radiation of wavelength 16000 Å is E 2 . What is the relation between these two: (1) E 1 =6E 2

Explain the un-ionized form of vanillin, Explain the un-ionized form of van...

Explain the un-ionized form of vanillin It is the un-ionized form of vanillin that has the typical odor.  In NaOH solution, the phenol group ofvanillin ionizes to its conjugate

The maximum probability of finding an electron, The maximum probability of ...

The maximum probability of finding an electron in the d xy   orbital is: (1)  Along the x-axis (2) Along the y-axis (3)  At an angle of 45 0 degree  from the  x  and y

Steam supply for experiments in heat, Steam  supply  for experiments in hea...

Steam  supply  for experiments in heat A tin with  a  press-on lid may be used to make a steam can. Punch two holes  in  the  lid  and solder by them one long and one short pip

Determine set of quantum numbers belong to highest energy, Which of the fol...

Which of the following set of quantum numbers belong to highest energy: (1) n=4, l=0, m=0, s= +1/2                (2) n=3, l=0, m=0, s= +1/2           (3) n=3 l=1, m=1, s

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd