Transcript Analytical Chemistry 2 Instrumental Analysis

Analytical Chemistry 2
Instrumental Analysis
Jobs in Analytical Chemistry
Nanotechnology
Essential Components of
an Instrument
1. Signal generator
Signal which reflects
the presence and
amount of analyte
present. This may
be an ion of the
analyte itself or some
attenuation of the
signal due to the
anayte being present
2. Detector (input
transducer):
Converts one kind of
signal to another.
Most detectors
convert analytical
signals to current or
voltage
Essential Components of
an Instrument
3. Signal Processor:
Signal is modified to
make it more
convenient to be
read by readout
device. Signal may
be filtered, amplified,
converting from
analog to digital, etc.
4. Readout device:
Transducer which
converts processed
signal into a signal
which is
understandable to
humans
Identify:
The signal generator in
a thermometer
The readout on a
thermometer
Which part of an
instrument is a
speedometer?
The signal generator in
a UV spectrometer
The input transducer in
a UV spectrometer
What is the transduced
signal in a UV spec?
What is the signal
processor in a UV
spec?
What is the readout in
a UV spec?
 Current world problems need Analytical
Chemistry to solve
Airline Security
 Design an instrument that
can tell if there is anything
“dangerous” in a suitcase.
You know, of course, that
not every metal object is
dangerous, nor is every
dangerous object metal.
Pay special attention to the
signal generating part of the
instrument.
Methods of Detecting
Analytes
1.
Physical means
Mass
color
refractive index
thermal conductivity
2. With electromagnetic radiation (spectroscopy)
absorption
emission
scattering
3. By an electrical charge
electrochemistry
mass spectrometry