Free Printable Atomic Absorption Spectroscopy

Worksheets

Atomic Absorption Spectroscopy

Total questions: 14

Worksheet time: 1hrs 1mins

Name

Class

Date

The transformation of a liquid into spray of small droplets of aerosols is called (a) .

Select the process occuring during atomization

desolvation

nebulization

combustion

volatilization

There are 2 types of burners in flame spectroscopy

Spark burner

Turbulent burner

Continuum burner

Premix burner

Give the type of this AAS.

(a)

Explain why source modulation is employed in AAS.

to eliminate interference caused by emission of the

radiated flame from analyte atoms and flame gas

species.

to tune the monochromator to a different spectral line for the element of interest so that there is no overlap.

to distinguish between the component of radiation

arising from the source and the component of

radiation arising from the flame background.

Radiation source in AAS is a ___________ which provide narrow emission bands

continuum source

line source

Common radiation source for line source used in AAS

Spark or arc ablation

Hollow cathode lamp (HCL)

Electrodeless discharge lamp (EDL)

Interference: is the presence of substance that changes the signal from the analyte of interest when analytes concentration remain the same. List 3 interferences in AAS.

Ionization interference

Spectral interference

Chemical interference

Fundamental interference

What is spectral interference?

any physical process that effects the light intensity at the analytical wavelength

some ions will be produced in hot flames

alteration in analyte absorbance caused by chemical processes during atomization

10.

In analysis of Ca using Atomic Emission Spectroscopy, the presence of sulphate ions and phosphate ions prevent the atomization of Ca²⁺ by forming non volatile salts. Name the type of interference described above.

spectral interference

chemical interference

ionization interference

11.

Methods to cure the spectral interference.

Zeeman background correction

Tune the monochromator to a different spectral line for the element of interest so that there is no overlap.

Adding lanthanum chloride (LaCl₃) to samples, standards and blank

12.

In the analysis of potassium in blood samples, it is recommended that the solutions used contain 1000 ppm of CsCl. Give the function of the CsCl solution.

(a)

13.

Methods to prevent chemical interferences.

Add ionization suppressor

Add protective agents such as EDTA.

Use a higher flame temperature.

14.

Formation of compounds between the metal and other components in flame. Choose the correct interference.