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Chapter 9: Q. 9.4 (page 228)

Describe how a deuterium lamp can be used to provide a background correction for an atomic absorption spectrum.

Short Answer

Expert verified

Background absorption occurs in the Atomic Absorption Spectrum (AAS) due to molecular absorption, which occurs in the gas phase where the particles scatter light in the light path. Background correction is aided by the use of a deuterium lamp.

Step by step solution

01

Step 1. Given information

To explain the mechanism of the deuterium lamp, which aids in providing background correction for the atomic absorption spectrum.

02

Step2. Continuum source background correction system’s diagram.

03

Step3. Mechanism of deuterium lamp

The Deuterium lamp emits UV radiation continuously. This is parallel to the hollow cathode lamp. A spinning chopper is present to alternately pass radiation from the cathode lamp and the Deuterium lamp into the atomizer. Background correction is accomplished by modifying the monochromator slit, which subtracts deuterium radiation.

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