Agriculture Reference
In-Depth Information
2.8040
2.2432
1.6824
1.2326
0.56079
0.000
200
300
400
500
600
700
800
WAVELENGTH (nm)
Figure 8.6.
UV-Vis spectrum of simple deionized water extract of soil. Absorption maximum is
indicated by an arrow. Note that the absorbance is above 1, and therefore the solution should be
diluted before attempting to interpret the spectrum.
D
A
B
C
Figure 8.7.
Sample holders for various spectrophotometric measurements: (
A
) UV-Vis cells;
(
B
) infrared attenuated total reflection (ATR) plate and stand—plate is attached to stand behind
it when in use; (
C
) simple KBr pellet maker using the two bolts and the center dye; (
D
) a sample
tube for NMR spectroscopy.
