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

How to solve, The total number of valence electrons in 4.2 gm N-3 of ion i...

The total number of valence electrons in 4.2 gm N-3 of ion is ( NA is the Avogadro''s number): (1) 1.6NA

The electronic configuration of a metal m, The electronic configuration of ...

The electronic configuration of a metal M   is  1s 2 , 2s 2 , 2p 6 , 3s 1 ,   The formula of its oxides will be: (1) MO                                                (2) M

Draw a temperature-composition phase diagram, Q. Use the following informat...

Q. Use the following information to draw a temperature-composition phase diagram for the binary system of H 2 O (A) and Na 2 SO 4 (B) at p = 1 bar, confining t to the range 20 to

Balancing redox equations, Q. How to balance a redox equation? Ans. ...

Q. How to balance a redox equation? Ans. Redox equations may be written and balanced by the ionic half-reaction method. Let's use the half-reaction method to balance the f

Describe properties of potassium permanganate., Potassium permanganate is p...

Potassium permanganate is prepared from pyrolusite  (MnO 2 ) . Pyrolusite is fused with KOH in the presence of atmospheric oxygen or an oxidising agent like potassium nitrate or po

Nitrocompounds, nitroalkane sare acidic in nature.Explain

nitroalkane sare acidic in nature.Explain

Discuss about the different types of stones, Discuss about the different ty...

Discuss about the different types of stones used for the construction and how to determine the good quality stone?

Favourable conditions for electrovalency, Favourable conditions for electro...

Favourable conditions for electrovalency are: (1) Low charge on ions, large cation, small anion (2) High charge on ions, small cation, large anion (3)High charge on ions,

Artificial process for manufacture of petrol or gasoline, Artificial proces...

Artificial process for manufacture of Petrol or gasoline  (a) Cracking, (b) Synthesis

Halides of boron and aluminium, Q. Halides of Boron and Aluminium? All ...

Q. Halides of Boron and Aluminium? All the elements of Group 13 form binary halides. All the four trihalides of each element are known, with one exception. The compound Tl13 is

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