Instrumental Analysis ACS Final Prep with Complete Solutions
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Course
Instrumental Analysis ACS
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Instrumental Analysis ACS
Instrumental Analysis ACS Final Prep with Complete SolutionsInstrumental Analysis ACS Final Prep with Complete SolutionsInstrumental Analysis ACS Final Prep with Complete SolutionsInstrumental Analysis ACS Final Prep with Complete Solutions
what are the difference between calibration sensitivity a...
Instrumental Analysis ACS Final Prep
with Complete Solutions
what are the difference between calibration sensitivity and analytical sensitivity -
ANSWER-calibration sensitivity is the slope of a calibration curve at the concentration of
interest while analytical sensitivity is a response to the noise ratio
how to calculate calibration sensitivity - ANSWER-y=mx+b (m is the calibration
sensitivity)
graph concentration vs mean analytical signal
how to find the analytical sensitivity - ANSWER-As (concentation) = calibration
sensitivity/SD [ ]
how to find the coefficient of variation for the mean of each of the replicate sets -
ANSWER-CV = SD/Average x 100
how to find the detection limit for method? - ANSWER-3.3*SD(blank)/calibration
sensitivity
voltage in a series - ANSWER-Vt = Vc + Vb + Va
Voltage in a parallel circuit - ANSWER-1/Veff = 1/Va + 1/Vb
Capacitance in a series - ANSWER-1/Ceff = 1/Ca + 1/Cb
capacitance equals - ANSWER-Q/V
if a spectrum is the result of a single scan while another is the result of multiple scans,
how man individual spectra were summed to increase S/N from 4.2 to 43?
a) formula?
b) answer - ANSWER-a) (S/N)a = sqrt(n) (S/N)b
b) 105
what type of noise can be reduced by decreasing the temperature of a measurement -
ANSWER-thermal noise
what type of noise can be reduced by decreasing the frequency used for the
measurement - ANSWER-flicker noise
what type of noise can be reduced by decreasing the bandwidth of the measurement -
ANSWER-environmental noise
, What would be an appropriate source and detector to determine the emission lines for
lithium from 200 to 780 nm? - ANSWER-flame and photo multiplier tube (PMT)
you've been asked to measure the UV absorbance of a sample containing poly cyclic
aromatic hydrocarbons, a byproduct of the incomplete combustion of organic matter.
What would be an appropriate material for the sample container? - ANSWER-fused
silica or quartz
which of the following changes will result in a decreased effective bandwidth?
a) increasing the number of blazes in the monochromatic grating
b) switching from a short-pass filter to a long-pass filter
c) increasing sample concentration
d) decreasing the amount of stray light - ANSWER-a
what would be the distance between blazes for a grating where the first order diffraction
line for 600 nm light is reflected at 10 degrees and the angle of incidence light is 45
degrees?
a) formula
b) answer - ANSWER-a) n(wavelength) = distance*(sin(i)+sin(r))
b) 680 nm
which of the following would be considered a discontinuous wavelength selector?
a) quartz prism
b) Czerny-Turner Grating (monochormator)
c)interference filter
d)glass prism - ANSWER-c
which characteristics are desirable for a radiation transducer?
a) high sensitivity to short wavelength light
b) low S/N ratio
c) consistent high output when not illuminated
d) constant response over large wavelength range
e) all of the above - ANSWER-d
define the term effective bandwidth - ANSWER-the wavelength range where the
intensity is half the maximal value. This parameter will be reported for an instrument to
inform the user regarding the resolution of data collected using the instrument
for grating, how many lines per millimeter would be required for the first-order diffraction
line for 400 nm to be observed at a reflection angle of 7 degrees when the angle of
incidences is 45?
a) formula?
b) answer - ANSWER-a) n*(wavelength) = distance *(sin(i) +sin (r))
1/d = lines/mm
b) 2072 lines/mm
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