C hapter 3 atomic absorption spectroscopy
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C hapter 3 Atomic Absorption Spectroscopy. 3.1. Theoretical Concepts 3.2. Atomic Absorption Instrumentation 3.3. Graphite Furnace Atomic Absorption 3.4. Control of Analytical Interferences. 3.1. Theoretical Concepts. The Atomic Absorption Process Theoretical Concepts

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C hapter 3 atomic absorption spectroscopy
Chapter 3 Atomic Absorption Spectroscopy

3.1. Theoretical Concepts

3.2. Atomic Absorption Instrumentation

3.3. Graphite Furnace Atomic Absorption

3.4. Control of Analytical Interferences


3 1 theoretical concepts
3.1. Theoretical Concepts

  • The Atomic Absorption Process

  • Theoretical Concepts

  • Quantitative Analysis

  • Characteristic Concentration

  • Detection Limits



Fig3-2 Grotrian diagrams for K

Fig 3-3Grotrian diagrams for Na


2 theoretical concepts integral formula of aas fig 3 4 typical shape of a atomic absorption line
2. Theoretical Concepts⑴Integral Formula of AASFig 3-4 Typical Shape of A Atomic Absorption line


Integral absorption formula by atomic theory
Integral Absorption FormulaBy atomic theory

(3.1)

By Line Shape Function

( the Nature distribute )

(3.2)

The Peak Absorption Coefficient k0 is:

(3.3)


Peak absorption theory by lambert beer s law
⑵ Peak Absorption Theoryby Lambert-Beer’s Law:

(3.4)

(3.5)

(3.6)



When:

va>> ve,

and

v0a= v0e,

then kv≈k0,



(3.9)

(3.10)



4 characteristic concentration
4. Characteristic Concentration

(3.11)



3 2 atomic absorption instrumentation
3.2. Atomic Absorption Instrumentation





2 line source hollow cathode lamp
2. line source (Hollow Cathode Lamp )

Fig 3-13



3 atomizer for aas pre mix burner system
3. Atomizer for AAS (Pre-Mix Burner System)



4 control of analytical interferences
4. Control of Analytical Interferences

Ionization interference

Matrix interference

Chemical interference

Background interference


Ionization interference
Ionization Interference

Ba → Ba+ + e-

K → K+ + e-






(4.13)

AHCL= Aa+ Ab

(4.14)

AD2=Ab,

(4.15)

Aa = AHCL- AD2


3 3 graphite furnace atomic absorption
3.3. Graphite Furnace Atomic Absorption

  • Graphite furnace atomizer components

  • The Graphite Furnace Power Supply and Programmer

  • Quantitative analysis GFAAS

  • Effect of Matrix on Height and Area


1 graphite furnace atomizer components
1. Graphite furnace atomizer components

The Graphite Furnace Atomizer

A basic graphite furnace atomizer is comprised of the following components:

· graphite tube

· electrical contacts

· enclosed water cooled housing

· inert purge gas controls


THGA graphite tube

Fig 4-27



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