Question
In: Chemistry
What is beam modulation and why is it used in atomic absorption?
What is beam modulation and why is it used in atomic absorption?
Solutions
Expert Solution
The beam may be carried over free space, or propagated through an optical waveguide. Depending on the parameter of a light beam which is manipulated, modulators may be categorized into amplitude modulators, phase modulators, polarization modulators etc. Often the easiest way to obtain modulation of intensity of a light beam, is to modulate the current driving the light source,
Beam modulation turns on and off the beam by chopping the signal. This allows any signal strength due to emission spectra within the flame to be eliminated
This is because even the best monochromators can not provide a bandwidth that is narrower than the atomic absorption line. If the bandwidth of the incident radiation is wider than the line width, measurement will fail as absorption will be only a tiny fraction of a large signal which is difficult to measure and will result in very low sensitivities. Therefore, line sourcesor modulation beam with bandwidths narrower than that of the absorption lines must be used .
queen_honey_blossom answered 2 years agoRelated Solutions
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Atomic absorption spectroscopy was used to determine the amount
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the spectrometer. The blank readings were as follows: 0.0086,
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Atomic absorption spectrometry was used with the method of
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a 1000.0 μg/mL Cd standard was added to 10.0 mL of solution. The
following data were obtained: Absorbance of reagent blank = 0.041
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sample?Later, the analyst...
Atomic absorption spectrometry was used with the method of standard additions to determine the concentration of...
Atomic absorption spectrometry was used with the method of
standard additions to determine the concentration of cadmium in a
sample of an industrial waste stream. For the addition, 10.0 μL of
a 1000.0 μg/mL Cd standard was added to 10.0 mL of solution. The
following data were obtained: Absorbance of reagent blank = 0.044
Absorbance of sample = 0.478 Absorbance of sample plus addition =
0.878 What was the concentration of the cadmium in the waste stream
sample?Later, the analyst...
Atomic absorption spectrometry was used with the method of standard additions to determine the concentration of...
Atomic absorption spectrometry was used with the method of
standard additions to determine the concentration of cadmium in a
sample of an industrial waste stream. For the addition, 10.0 μL of
a 1000.0 μg/mL Cd standard was added to 10.0 mL of solution. The
following data were obtained: Absorbance of reagent blank = 0.043
Absorbance of sample = 0.320 Absorbance of sample plus addition =
0.840
What was the concentration of the cadmium in the waste stream
sample?
_____ μg/ml...
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method of standard additions to determine the concentration of
cadmium in a sample of an industrial waste stream. For the
addition, 10.0 μL of a 1000.0 μg/mL Cd standard was added to 10.0
mL of solution. The following data were obtained: Absorbance of
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standard additions to determine the concentration of cadmium in a
sample of an industrial waste stream. For the addition, 10.0 μL of
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solution. The results obtained are shown in the table. Absorbance
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the concentration of the cadmium in the waste stream sample? c = μ
g /...
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