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WorksheetsAtomic Absorption
Total questions: 37
Worksheet time: 38mins
Which of the following analytical systems does not require a light source?
Atomic absorption
Spectrophotometry
Spectrofluorometry
Luminometer
In atomic absorption spectroscopy, Which of the following statements is false:
Flame is used to excite the element to a higher energy state
A Hallow-Cathode Lamp with a cathode made of the element to be analyzed is used to produce a wavelength of light specific to the material
This light is absorbed by the ground state atoms in the flame
There is a net decrease in the intensity of the beam
Which of the following statements about atomic absorption is not true:
It requires that element to be measurement be brought to a non-ionized ground state
It uses a tungsten lamp as a light source
It uses a cathode made of the same element being measured
It measures the absorption of light
Which of the following is the principle of Atomic Absorption Spectroscopy?
Radiation is absorbed by non-excited atoms in a vapour state and is excited to higher states
Medium absorbs radiation and transmitted radiation is measured
Colour is measured
Colour is simply observed
In Atomic Absorption Spectroscopy, which of the following is the generally used radiation source
Tungsten lamp
Xenon mercury arc lamp
Hydrogen or deuterium discharge lamp
Hollow cathode lamp
In Atomic Absorption Spectroscopy, with what material is the cathode in Hollow cathode lamp constructed?
Tungsten
Quartz
Element to be investigated
Aluminium
How can the intensity of radiation be increased in the Hollow cathode lamp?
Addition of non-conductive protective shield of mica
Addition of nitrogen to neon or argon in the lamp
Increasing the pressure of the filling gas
Changing the metal of the anode
Which of the following is the function of the chopper in Atomic Absorption Spectroscopy?
To split the beam into two
To break the steady light into a pulsating light
To filter unwanted components
To reduce the sample into atomic state
Which of the following is the function of the Flame or Emission system in Atomic Absorption Spectroscopy?
To split the beam into two
To break the steady light into pulsating light
To filter unwanted components
To reduce the sample into atomic state
Atomic absorption spectroscopy is also called Absorption Flame Photometry
True
False
Which of the following is not a component of the emission system in the Flame photometer?
Burner
Atomiser
Fuel gases and their regulation
Chopper
Which of the following is the function of the atomiser in the emission system of Atomic Absorption Spectroscopy?
To split the beam into two
To break the steady light into pulsating light
To break a large mass of liquid into small or atomic drops
To reduce the sample into an atomic state
Which of the following is not a fuel used in flame photometry?
Acetylene
Propane
Hydrogen
Camphor oil
Which of the following is not the requirement of a good flame in flame photometer?
Liquid sample must be evaporated to form a solid residue
Solid residue must decompose to form atoms
Atoms must be produced such that they have the ability to get excited to higher states
Atoms must be produced such that they are in a stable state
Atomic Absorption Spectroscopy is used for the analysis of metals.
True
False
Which of the following options explains the process of ‘sputtering’ that occurs in Hollow Cathode Lamp?
Positive ions collide with the cathode surface and metal atoms from the cathode are ejected
Negative ions collide with the cathode surface and metal atoms from the anode are ejected
Positive ions collide with negative ions and metal atoms from the anode are ejected
Positive ions collide with negative ions and photons are ejected
At what pressure should the gases in the sealed tube be maintained in the Hollow cathode lamp?
1 to 5 torr
20 to 30 torr
40 to 50 torr
50 to 55 torr
The diagram shown below is the picture of the Hollow cathode lamp. Identify the unmarked component.
Glass tube
Quartz window
Non- conducting glass
Mica shield
Atomic absorption spectroscopy (AAS) is used for determining the dilution of a particular element (the analyte) in a sample to be analyzed.
True
False
Atomic absorption spectroscopy (AAS) is a technique in which free gaseous atoms absorb electromagnetic radiation at a specific wavelength to produce a corresponding measurable signal.
True
False
The absorption signal is disproportional to the concentration of the free atoms present in the optical path.
True
False
AAS requires standards with unknown analyte content to establish the relationship between the absorbance and the analyte volume.
True
False
Atomic absorption spectroscopy (AAS) relies on ......
Beer–Lambert law
Bankruptcy Law
Business (Corporate) Law
Carbon-Atom Law
Which of the following is not basic functional parts of AAS :
Light source
Nebulizer & Atomizer section
Monochromator
Detector & Recorder
Wavelength
What kind of inert gas is placed in the hollow cathode lamp
Ar
Ne
Both
which of the following is not light or radiation source in AAS:
Electrode-less Discharge Lamps (EDLs)
Hollow Cathode Lamp
Deuterium Lamp
Hollow Anode Lamp
The Nebulizer introduces the sample as a fine mist and the spray chamber to create a good mix for both air and the fuel gas.
True
False
Pneumatic is considered one of the most common types of Nebulizer
True
False
Ultrasonics nebulizer is not considered one of the common types of Nebulizer
True
False
The monochromator is used to isolate a single atomic resonance line from the spectrum of lines emitted from the interaction of the sample with the resonance light from a hollow cathode lamp
True
False
The conversion of the sample to gaseous atoms is called atomization.
True
False
Introducing the analyte in a steady manner is called a continuous atomizer
True
False
Introducing the analyte in a discontinuous manner is called a discrete atomizer
True
False
The purpose of the atomization step is to convert the analyte to a reproducible amount of gaseous atoms that represents the sample.
True
False
The most common continuous atomizer in AAS is the electrothermal atomizer.
True
False
The most common discrete atomizer in AAS is the flame atomizer.
True
False
The amount of light getting to the detector is a function of the concentration of the element of interest in the sample being analyzed.
True
False
