MODULE 19

Question 1

It measures the light
absorbed by atoms dissociated by heat

Answer 1

Atomic Absorption
Spectrometry

Question 2

It is used to measure concentration by detecting absorption of electromagnetic radiation by atoms rather than by molecules

Answer 2

Atomic Absorption
Spectrometry

Question 3

It is routinely used to measure
concentration of trace metals that are not easily excited

Answer 3

Atomic Absorption
Spectrometry

Question 4

AAS are used for the qualitative and
quantitative determination of more than _______ elements

Answer 4

70 elements

Question 5

these methods can detect parts
per million to parts-per-billion amounts,
and in some cases, even smaller
concentrations.

Answer 5

Atomic Absorption
Spectrometry

Question 6

critical step; a process in which a
sample is volatilized (easily evaporated) and decomposed in such a way as to produce gasphase atoms and ions

Answer 6

Atomization

Question 7

used to convert ions to atoms

Answer 7

Atomizer

Question 8

other name for chopper

Answer 8

Rotating sector Mirror

Question 9

what type of spectrometry is rapid, convenient, and usually of high
selectivity

Answer 9

Atomic Absorption
Spectrometry

Question 10

what spectrometry is generally more sensitive than flames
emission

Answer 10

Atomic Absorption
Spectrometry

Question 11

it is more accurate, precise, and specific

Answer 11

Atomic Absorption
Spectrometry

Question 12

internal standard is not needed

Answer 12

Atomic Absorption
Spectrometry

Question 13

the first commercial Atomic Absorption
(AA) spectrometer was introduced in _________

Answer 13

1959

Question 14

used for background correction
is also shown.

Answer 14

deuterium continuum radiation source

Question 15

is used to isolate
the desired emission line from other lamp emission lines.

Answer 15

Monochromator

Question 16

what is the usual light detector in AAS

Answer 16

PM TUBE

Question 17

It is one of the most widely used
techniques for the determination of metals at trace levels in solution.

Answer 17

Atomic Absorption
Spectrometry

Question 18

It consists of a sealed glass envelope with a quartz end-window, and containing a hollowed-out cylindrical cathode of some 2 mm internal diameter together with a
tungsten wire anode

Answer 18

HOLLOW CATHODE LAMP

Question 19

a relatively new light source for atomic
absorption spectrophotometers
the lamp contains no electrodes

Answer 19

ELECTRODELESS DISCHARGE TUBES

Question 20

the production of a homogeneous atomic vapor from a sample is
achieved by aspirating a solution into a flame or evaporating small volumes

Answer 20

Sample Vaporization

Question 21

sample solution is drawn first into a nebulizer by the flow of support gas where it forms a mist or aerosol.

Answer 21

Flame Vaporization

Question 22

the production of an atomic vapor can be achieved without using a flame

Answer 22

FLAMELESS VAPORIZATION

Question 23

two forms of flameless atomizer

Answer 23

GRAPHITE TUBE
CARBON ROD

Question 24

proved to be the most generally effective and popular. It is widely used in a variety of modifications

Answer 24

Graphite Tube / L’Vov Furnace

Question 25

simpler device having a
small shallow recess for the sample
machined in the top surface.

Answer 25

CARBON ROD

Question 26

the newest of the optical atomic
spectroscopic methods.

Answer 26

Atomic Fluorescence Spectrometry

Question 27

what is the biggest disadvantage of ASF

Answer 27

QUENCHING EFFECT

Question 28

changes in pH affect
availability of electrons, and
temperature changes the
probability of loss of energy by
collision rather than fluorescence.

Answer 28

quenching

Question 29

Used in routine analysis of metallurgical
and mineral samples.

Answer 29

XRAY EMISSION SPECTROMETRY

Question 30

is a simpler and more
versatile technique than atomic
absorption, but suffers from a
susceptibility to quenching effects

Answer 30

Atomic Fluorescence Spectrometry