Pharmaceutical Analysis

Chapter 4

Atomic Absorption Spectroscopy

INTRODUCTION

Atomic absorption spectroscopy (AAS) is defined as the measurement and interpretation of the absorbed radiation in atomic level. This method is widely used for the determination of the elements. Robert Wilhelm Bunsen and Gustav Robert Kirchoff first proposed the AAS theory. Alan Walsh first introduced the principle of AAS.

PRINCIPLE

The atoms present in the ground state absorb the radiation produced by the flame and excited to the excited state and which is measured by the AAS spectrometer. Atomic absorption measures the amount of light at the wavelength which is absorbed by the atoms. Atoms present in the sample are directly proportional to the absorption intensity.

 

 

Schematic diagrams ...