Instrumental Analysis Chapter 10 questions with
verified answers
AES and AAS are what kind of methods to each other Ans✓✓✓
complementary
are arc and spark spectrometers stable sources of emission Ans✓✓✓
no
are chemical interferences high or low in AES Ans✓✓✓ low
characteristics of array-based Ans✓✓✓ no exit slits, wide aperture,
array of detectors
characteristics of polychromator Ans✓✓✓ around 60 exit slits, each slit
has individual detector, curved focal plane, fast, expensive
how are calibration curves for AES plotted Ans✓✓✓ log photocurrent
vs log concentration
how can the CN band problem be resolved Ans✓✓✓ remove nitrogen,
perform analysis with inert gas, or use a vacuum
, how does pneumatic nebulizer work Ans✓✓✓ Flow of a gas breaks up
the liquid around the capillary tip and mist is carried with the flow to
atomizer
how does Ultrasonic nebulizer work Ans✓✓✓ solution is on
piezoelectric crystal surface, which vibrates and breaks up the liquid,
and the mist is carried to atomizer
how is a stable emission obtained in arc Ans✓✓✓ by adjusting the rate
of sample volatilization
how is the arc initiated Ans✓✓✓ spark causes ionization of
electrode/analyte
what are advantages of array-based instruments Ans✓✓✓ fast,
flexible, measure full wavelength range
what are advantages to AES Ans✓✓✓ Higher T, higher atomization,
lower interferences, Excitation of multiple elements, no line sources,
High sensitivity, Detection of nonmetals
what are disadvantages to AES Ans✓✓✓ Complex spectra, increased
spectral interferences, expensive
verified answers
AES and AAS are what kind of methods to each other Ans✓✓✓
complementary
are arc and spark spectrometers stable sources of emission Ans✓✓✓
no
are chemical interferences high or low in AES Ans✓✓✓ low
characteristics of array-based Ans✓✓✓ no exit slits, wide aperture,
array of detectors
characteristics of polychromator Ans✓✓✓ around 60 exit slits, each slit
has individual detector, curved focal plane, fast, expensive
how are calibration curves for AES plotted Ans✓✓✓ log photocurrent
vs log concentration
how can the CN band problem be resolved Ans✓✓✓ remove nitrogen,
perform analysis with inert gas, or use a vacuum
, how does pneumatic nebulizer work Ans✓✓✓ Flow of a gas breaks up
the liquid around the capillary tip and mist is carried with the flow to
atomizer
how does Ultrasonic nebulizer work Ans✓✓✓ solution is on
piezoelectric crystal surface, which vibrates and breaks up the liquid,
and the mist is carried to atomizer
how is a stable emission obtained in arc Ans✓✓✓ by adjusting the rate
of sample volatilization
how is the arc initiated Ans✓✓✓ spark causes ionization of
electrode/analyte
what are advantages of array-based instruments Ans✓✓✓ fast,
flexible, measure full wavelength range
what are advantages to AES Ans✓✓✓ Higher T, higher atomization,
lower interferences, Excitation of multiple elements, no line sources,
High sensitivity, Detection of nonmetals
what are disadvantages to AES Ans✓✓✓ Complex spectra, increased
spectral interferences, expensive
