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

Find an expression for galvanic cell, Q. The state of a galvanic cell witho...

Q. The state of a galvanic cell without liquid junction, when its temperature and pressure are uniform, can be fully described by values of the variables T, p, and . Find an expre

Organic, Write essey on organic quantitative analysis

Write essey on organic quantitative analysis

Atomic structure, the most probable radius for finding the electron in he+

the most probable radius for finding the electron in he+

Unit cell, how can i make best assignment on unit cell topic?

how can i make best assignment on unit cell topic?

Chlorination, 90ml of an unknown concentrated chlorine was diluted with 225...

90ml of an unknown concentrated chlorine was diluted with 2250l of water.The dilution now is 0.08mg/l. what is the initial concentration of the chlorine before dilution?

Explain the effects of temperature on multicomponent systems, Explain the E...

Explain the Effects of Temperature on multicomponent systems? For some of the derivations in this chapter, we will need an expression for the rate at which the ratio μ i /T var

The outer electronic structure 3s2 3p5 is possessed, The outer electronic...

The outer electronic structure 3s 2 3p 5    is possessed by: (1) Cl       (2) O        (3) Ar      (4) Br ans:  Cl

Catalysts , CATALYSTS A catalyst is a species that speeds up a chemica...

CATALYSTS A catalyst is a species that speeds up a chemical reaction but is not itself consumed. Catalysts do not change the thermodynamics of the position of equilibrium or a

Explain about monohalides, Q. Explain about Monohalides? Monohalides of...

Q. Explain about Monohalides? Monohalides of the type M 2 X 2 , (where X = F, C1 and Br) are formed only by 0. S and Se. Oxygen monofluoride decomposes above 25 K. These monoha

What is a salt bridge, What is a salt bridge? Salt bridge is a device ...

What is a salt bridge? Salt bridge is a device used to link two electrodes on electrochemical cell. It maintains electrical neutrality and internal continuity. It is shown by

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