Atomic Emission Spectroscopy

Question 1

These are thermally excited so that they emit light

Answer 1

Atoms

Question 2

The radiation emitted by atoms are ______________

Answer 2

measured

Question 3

Another name for atomic emission spectroscopy

Answer 3

Flame photometry

Question 4

Atomic emission spectroscopy is also called

Answer 4

Optical emission spectroscopy (OES)

Question 5

[TRUE/FALSE] Emitted light can be viewed through a spectroscope to produce a line emission spectrum

Answer 5

TRUE

Question 6

A series of colored lines on a dark background

Answer 6

Line emission spectrum

Question 7

[TRUE/FALSE] The line emission (atomic) spectrum of an element is always similar to one another.

Answer 7

FALSE, it is unique.

Question 8

Common elements with emission lines

Answer 8

CaBaNaLiK
- calcium, barium, sodium, lithium, potassium

Question 9

The sample passes through these materials during instrumentation

Answer 9

Flame, monochromator/filter, detector

Question 10

Sample containing the metal is volatilised in what type of flame? At what degrees?

Answer 10

natural gas / compressed air flame at 2000 degrees C

Question 11

A higher temperature flame reaches what degrees?

Answer 11

2500 degrees C

Question 12

A higher degree flame (2000 deg. C) may be obtained using what type of flame?

Answer 12

Air / acetylene

Question 13

A higher temperature (2500 deg C) is required for the analysis of what element?

Answer 13

Mg by AES

Question 14

In more expensive instruments, the radiation emitted by the excited atoms passes through what?

Answer 14

Filter or monochromator

Question 15

As the emitted radiation passes through this, a narrow band of radiation is selected and interfering sources of radiation in the sample are screened out

Answer 15

Filter or monochromator

Question 16

What are some examples of interfering sources of radiation?

Answer 16

Flame and other components

Question 17

The intensity of the selected radiation is measured by a detector using what type of cell?

Answer 17

Photosensitive cell

Question 18

Interference that may reduce the observed emission from the sample

Answer 18

Ionization

Question 19

Interference that can either increase or decrease the rate at which the sample is drawn into the flame relative to the standard solution

Answer 19

Viscosity

Question 20

Interference that gives a false high or low reading

Answer 20

Viscosity

Question 21

Anions form what type of salts with metal ions?

Answer 21

Involatile salts

Question 22

[TRUE / FALSE] Anions reduce the reading of the sample solution.

Answer 22

TRUE

Question 23

Examples of anions

Answer 23

Sulphate and phosphate

Question 24

Quantification of alkali metals in

Answer 24

alkali metal salts, infusion and dialysis solutions

Question 25

Application of AES in pharmaceutical analysis includes

Answer 25

• quantification of alkali metals in alkali metal salts, infusion and dialysis solutions
• determination of metallic impurities in some of the other inorganic salts used in preparing these solutions

Question 26

Provides a robust, cheap, and selective method based on relatively simple instrumentation for quantitative analysis of some metals

Answer 26

Strength

Question 27

Only applicable to the determination of alkali and some alkaline earth metals

Answer 27

Limitation of AES

Question 28

ICP-AES stands for

Answer 28

Inductively-Coupled Plasma Atomic Emission Spectroscopy

Question 29

[TRUE / FALSE] If high enough temperatures can be reached, only some elements can be excited to a level where it will produce emission of radiation

Answer 29

FALSE, any element

Question 30

High temperatures can be achieved by using __________

Answer 30

plasma emission

Question 31

Heating argon with high intensity RF radiation

Answer 31

Plasma emission

Question 32

Provides rapid analysis of active ingredients due to its high sensitivity and specificity which is advantageous during formulation development

Answer 32

ICP-AES