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HCL Lamps in Analytical Chemistry

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Questions and Answers

What is the purpose of modulating the radiation source in atomic absorption spectroscopy?

To discriminate between the radiation from the hollow cathode lamp and the radiation given off by excited atoms in the flame (correct)

To increase the intensity of the radiation

To improve the sensitivity of the instrument

To reduce the noise from the detector

What is the main purpose of using a chopper in atomic absorption spectroscopy?

To increase the intensity of the radiation

To modulate the radiation source (correct)

To reduce the noise from the detector

To improve the sensitivity of the instrument

What type of interference is more common in atomic absorption spectroscopy?

Spectral interference

Chemical interference (correct)

Instrumental interference

Physical interference

What is the effect of formation of low volatility compounds in atomic absorption spectroscopy?

Decrease in absorbance signal Signup and view all the answers

How can the effects of low volatility compounds be minimized in atomic absorption spectroscopy?

By using a higher flame temperature Signup and view all the answers

What is the purpose of adding releasing agents in atomic absorption spectroscopy?

To prevent the analyte from reacting with the interferant Signup and view all the answers

What type of complex is formed between Mg and Al in atomic absorption spectroscopy?

Heat stable complex Signup and view all the answers

What is the effect of chopper modulation on the detector signal in atomic absorption spectroscopy?

It creates an ac signal Signup and view all the answers

What is the purpose of using a mechanical chopper in atomic absorption spectroscopy?

To modulate the radiation source Signup and view all the answers

What type of radiation is given off by excited atoms in the flame in atomic absorption spectroscopy?

Visible radiation Signup and view all the answers