L1 /
6
CH3041
SPECTROMETRY
In IR & UV-Vis the spectrometers are quite
similar, the wavelengths used are:
similar, the wavelengths used are:
UV-Vis:
180 nm to 380 to 780 nm
IR: 2.5
mm to 25 mm
(4000
- 400cm-1)
A plot of wavelength versus
absorption is obtained (CH1012 Kc Cr2O72-).
absorption is obtained (CH1012 Kc Cr2O72-).
Beers Law is used
to relate the absorption
A to the analyte conc. A = e l [i] i = analyte
(NOx prac, phosphate prac)
A to the analyte conc. A = e l [i] i = analyte
(NOx prac, phosphate prac)
UV-Vis is used in: NO3-(aq), PO43-(aq),
...
IR is usually used in air quality control for
measuring concs of CO.
measuring concs of CO.
assign to analyte of interest
0%
100%
A
