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CC1 LECTURE DEAN > SPECTROPHOTOMETRY PART 1 > Flashcards

SPECTROPHOTOMETRY PART 1 Flashcards

1
Q
  • monochromator used is either a prism or a diffraction gratig
A

spectro

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2
Q
  • wavelength selector
A

monochromator

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3
Q
  • filter
A

photometer

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4
Q

Electrons are excited when subjected to the heat of a flame. as they return to a ground state, they emit radiation of a characteristic wavelength

A

FLAME PHOTOMETRY

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5
Q

FLAME PHOTOMETRY

Component parts

A

Atomizer, flame air and gas supply, monochromator, detector, readout device

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6
Q

FLAME PHOTOMETRY

Use

A

Na+, K+, Li+

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7
Q

Sodium =

A

yellow

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8
Q

Rubidium =

A

red

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9
Q

Potassium =

A

violet

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10
Q

Magnesium =

A

blue

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11
Q

Lithium =

A

red

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12
Q

mixture of Hydrogen and Oxygen gas

A

Gases for Flame Photometry

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13
Q

Oxygen gas

A

Natural gas
Acetylene
Propane

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14
Q
  • for Na and K determination
A

Propane

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15
Q

Burner Assembly

A

aspirator
atomizer/nebulizer
flame

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16
Q

breaks the chemical bonds to produce atoms

A

Burner Assembly

17
Q

cause excitation of the electrons of an atom

A

Burner Assembly

18
Q

Internal standard:

A

Lithium or Cesium

19
Q

Burner Assembly Advantages:

[?] intensity
absent from [?]
emits wavelength different from [?]
(?) as radiation buffer

A

high emision
biological fluid/ trace element
Na and K
Li

20
Q

Burner Assembly Importance:

A

to achieve stability

21
Q

TWO TYPES OF BURNERS OF A FLAME PHOTOTMETER

A

TOTAL CONSUMPTION BURNER
LAMINAR FLOW BURNER OR PRE-MIX BURNER

22
Q

Gases are passed at high velocity over the end of a capillary suspended in the solution, causing liquid to be drawn up through the capillary into the flame

A

TOTAL CONSUMPTION BURNER

23
Q

Gravitational feeding of solution through a restricting capillary into an area of high velocity gas flow where small droplets are produced and passed into the flame

A

LAMINAR FLOW BURNER OR PRE-MIX BURNER

24
Q

ESSENTIAL PARTS OF THE FLAME PHOTOMETER

A

MONOCHROMATOR

25
Q

Interference filter

A

MONOCHROMATOR

26
Q

Maximum amount of the line emission to pass through the detector

A

narrowest band path

27
Q

: giving-off of various wavelengths by non-ionic materials

A

Continuous emission

28
Q

Measures light absorbed by ground state atoms.

A

ATOMIC ABSORPTION SPECTROPHOTOMETRY

29
Q

ATOMIC ABSORPTION SPECTROPHOTOMETRY

Band path width:

A

0.001 to 0.01 nm

30
Q

ATOMIC ABSORPTION SPECTROPHOTOMETRY

Component parts

A

Hollow cathode lamp (with argon or neon gas), atomizer, burner, monochromator, detector, readout device

31
Q

ATOMIC ABSORPTION SPECTROPHOTOMETRY

Use

A

Calcium
Magnesium
Copper
Zinc
Lead

CC1 LECTURE DEAN (14 decks)

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