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PA 2 > AAS > Flashcards

AAS Flashcards

1
Q

It is an analytical technique that measures the concentrations of
elements. It makes use of the absorption of light by these elements in order to measure their
concentration.

A

ATOMIC ABSORPTION SPECTROSCOPY (AAS)

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2
Q

It quantifies the absorption of ground state atoms in the gaseous state.

A

ATOMIC ABSORPTION SPECTROSCOPY (AAS)

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3
Q

These are usually determined from a working curve after calibrating the instrument with standards of known concentration.

A

Concentration measurements

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4
Q

They absorb ultraviolet or visible light and make transitions to higher electronic energy levels.

A

atoms

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5
Q

It is determined from the amount of absorption.

A

Analyte Concentration

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6
Q

It is a very common technique for detecting metals and metalloids in environmental samples.

A

Atomic absorption

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7
Q

4 principal components of Atomic absorption spectrometers

A

1- A light source ( usually a hollow cathode lamp)
2 - An atom cell (atomizer )
3 - A monochromator
4 - A detector, and read out device.

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8
Q

The usual light source of the element that is being measured

A

hollow cathode lamp

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9
Q

It contains a tungsten anode and a hollow cylindrical cathode made of the element to be determined. These are sealed in a glass tube filled with an inert gas (neon or argon).

A

Hollow cathode lamp

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10
Q

Elements to be analyzed needs to be in ___

A

atomic sate

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11
Q

It is the separation of particles into individual molecules and breaking molecules into atoms.

  • This is done by exposing the analyte to high temperatures in a flame or graphite furnace.
A

Atomization

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12
Q

two types of atomization:

A

Flame and Graphite Furnace Atomization

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13
Q

Gas/Air

A

1700-1900

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14
Q

Gas/O2

A

2700-2800

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15
Q

H2/Air

A

2000-2100

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16
Q

H2/O2

A

2550-2700

17
Q

C2H2/Air

A

2100-2400

18
Q

C2H2/O2

A

3050/3150

19
Q

C2H2/N2O

A

2600-2800

20
Q

It uses excited atoms

A

Atomic Emission

21
Q

It uses ground-state atoms

A

Atomic Absorption

22
Q

The fine mist of droplets is mixed with ___ and ____ and burned.

A

fuel (acetylene), and oxidant (nitrous oxide)

23
Q

It is important because it influences the distribution of atoms.
- It can be manipulated by oxidant and fuel ratio.

A

Flame temperature

24
Q

any factor that affects the ground state atom population

A

Interference

25
Q

Factors that may affect the ability of the instrument to read this parameter

A

Interference

26
Q

Element other than the one of interest may absorb the wavelength being used.

A

Absorption and Source Radiation

27
Q

the formation of ions rather than
atoms causes lower absorption of radiation. This problem is overcome by adding ionization suppressors.

A

Ionization Interference

28
Q

the atoms of the same kind that are absorbing radiation will absorb more at the center of the line than at the wings and thus resulting in the change of shape of the line as well as its
intensity.

A

Self Absorption

29
Q

This is caused by the presence of a particle from incomplete atomization .This problem is overcome by increasing the flame temperature

A

Background Absorption of Source Radiation

30
Q

Rate of aspiration, nebulization, or transport of the sample (e g viscosity, surface tension, vapor pressure , and density)

A

Transport Interference

31
Q

Analyzing metals in biological fluids such as blood and urine.

A

Clinical Analysis

32
Q

Monitoring our environment -e g finding out the levels of various elements in rivers, seawater, drinking water, air, and petrol.

A

Environmental Analysis

33
Q

In some pharmaceutical manufacturing processes, minute quantities of a catalyst used in the process (usually a metal) are sometimes present in the final product.

By using AAS the amount of catalyst present can be determined.

A

Pharmaceuticals

34
Q

Many raw materials are examined and
AAS is widely used to check that the major elements are present and that toxic impurities are lower than specified - e q in concrete, where calcium is a major constituent, the lead level should be low because it is toxic.

A

Industry

35
Q

It is the analyte that you want to analyze

A

Standard of Known Concentration

PA 2 (9 decks)

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