Geoscience Reference
In-Depth Information
(A)
12 3456
7
891011 12
Filter number
13
13 Filter Channels (nm)
1500
1 - 239
2 - 265
3 - 290.6
4 - 300.7
5 - 313.7
6 - 334.4
7 - 370
8 - 400
9 - 420
10 - 435.8
11 - 451.4
12 - 470
13 - 685
1000
500
0
250
300
350
400
450
500
550
600
650
Wavelength (nm)
(B)
3500
3000
2500
2000
1500
1000
30
500
20
0
10
300
400
Time (h)
500
0
600
700
Wavelength (nm)
Figure 6.6 . (A) Wavelength positions of the interference filters used in a portable LIF system overlaid
on top of a fluorescence spectrum of seawater. (B) Laser-induced fluorescence results for seawater as
a function of time along a cruise tract. (Redrawn from Sivaprakasam et al., 2003 .)
over a 32 hour period ( Figure 6.6B ). These types of instruments allow for sensitive multi-
spectral fluorescence data with fine temporal and spatial resolution.
In addition to the transition of fluorescence techniques from the laboratory to submers-
ible field measurements, there have also been great advances in the development of non-
submersible, portable, handheld fluorometers. Most of this technology has been geared
toward wastewater characterization during treatment processes, protein detection, and as
a tool for water management issues. For these instruments, power requirements are less of
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