Which one of the following is used for the formation of atomic vapours in Atomic Absorption Spectroscopy ?
Flame atomization
In atomic absorption spectroscopy the sample solution must be converted into a cloud of free, ground-state atoms that can absorb the line radiation of a hollow-cathode lamp.
The standard way of doing this is flame atomization: the solution is nebulised into an air–acetylene or nitrous oxide–acetylene flame, where the solvent evaporates, the salt vaporises and the molecules dissociate into free atoms in the ground state.
Electric arcs and sparks give very high temperatures that excite and ionise atoms; they are emission sources used in atomic emission spectroscopy, not atomisers for absorption measurements.
Sputtering devices (glow-discharge sources) are used mainly for direct analysis of solid conducting samples in emission or mass spectrometry, and a simple oven does not produce a reproducible atomic vapour (the furnace used in AAS is a specially designed electrically heated graphite tube).
Therefore the method used to produce atomic vapour in AAS is flame atomization.
Hence, Flame atomization.
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.................... is a client server application that identifies each host on the internet with a unique user-friendly name.
Every OS has a ................ or .......... which primarily resides in the main memory of the computer to perform some of the basic functions of the OS.
(i) Kernel
(ii) Interface
(iii) Nucleus
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(i) Machine language
(ii) Assembly language
(iii) High level language
(iv) Natural language
Codes:
Match the following:
List I List II (a) New York Public Library (i) Shelv AR (b) Miami University Augmented Research Group (ii) Smart library (c) Oula University Library (iii) Wolf Walk (d) North Carolina State University (iv) Find the future Codes:
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