AAS

 AAS Article
  • 17.08.2019
  • 210
  • AAS

PRINCIPLE

 INSTRUMENTATION

 TEST AUTOMIZATION TECHNIQUES

 INTERFERENCES AND

APPLICATIONS.

ELEMENTAL EVALUATION SUCH AS WILLPOWER

OF

SODIUM, POTASSIUM, CALCIUM SUPPLEMENTS,

PHOSPHOROUS,

SULFUR, CHLORINE, BROMINE AND IODINE

Introduction

AAS used while an deductive tool was first

developed by an Australian physicist

Alan walah

Atomic spectrometric methods are rapid

, hassle-free and have high selectivity

The method involves a process named as

atomization in which the test is transformed

to a gaseous phase atoms or ions

Atomic compression spectroscopy is dependent on the same

principle as the flame check used in qualitative analysis.

When an alkali material salt or maybe a calcium, strontium or ba (symbol)

salt is heated highly in the Bunsen flame, a characteristic fire colour is usually observed:

Em -- yellow

Li-- crimson

Ca-- stone red

Sr-- crimson

Handbag --green

Inside the flame, the ions happen to be reduced to gaseous steel atoms.

Substance

-------- heat------- atoms

The high temperature from the flame excites a valence electron to a higher-energy orbital. The atom then gives off energy by means of (visible) mild as the electron comes back into the bottom energy orbital (ground state).

excited state

absorbed energy

emitted strength

E sama dengan h. c/ʎ

ground express

The ground state atom absorbs light of the same

characteristic wavelengths as it gives off when going back from

the excited condition to the ground state.

The intensity with the absorbed light is proportionate to the

concentration of the element in the flame.

quantitative analysis

Absorbance or emission of atomic fumes is measured.

Oxidation claims (e. g. Fe2+, Fe3+) cannot be

known.

Atomic Spectra

Example: Hydrogen

principal portion number n ( shell)

orbital portion number m ( t, p...

orbitals)

Some changes in the H spectrum

n=1

n=5

n=4

n=3

n=2

l=012

unreal line in the

visible selection

spectral collection in

the UV range

Energy can be absorbed or emitted,

for the electron moves from one

condition to another. The emission

spectrum consists of categories of

discrete lines corresponding to

electronic changes.

principle

The principle entails two methods

 Production

of free atoms

 Consumption

of radiation from external source simply by

atoms.

Development of free atoms

Flame atomization

Sample is definitely introduced

constantly

Contains concentric

nebulizer and burner

with laminar flow

Enhanced selectivity and

reproducibility

Electro heat

atomization

Sample introduced using

a under the radar device-syringe

or auto sampler

Small electrically heated

furnace

Involves blow drying, ashing,

fractionnement

Analytical selection is low.

Chemical interferences

are common

flame

atomizati

on

process

Compression of the radiation from

exterior

source

Free atoms released absorb radiation by an

external source with wavelength > 200nm

In vaccum •Part of the strength of the occurrence radiation P0 is

absorbed.

The sent power, G, may be

written as

P=P0 e –(kv. b)

b- average density of the fascinating, gripping, riveting

medium

KAVIAR – ingestion coefficient with the

analyte.

•If the method utilized quantitatively width of

reverberation line is known as.

width is usually less than zero. 001nm

•Width of the vibration line should be less

than width in the analyte in the

flame.

ARRANGEMENT

Parts of the instrument contain:

light source-hallow cathode

lamp

atomizer

monochromator

detectors-photomultiplier pontoons

Double light beam atomic absorption

spectrophotometer

INTERFERNCES

Background consumption

These type of interferences are often

associated with fire, caused by a huge

amount of species within the test.

Species include-metal oxides, -oh radicals,

hydrogen molecules, helpings of...


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