Physicochemical Effects
239
Marine Surface
River Permeate
Marine Permeate
Marine Retentate
River Retentate
River CDOM
C
A
M
N
B
T
Int
Excitation wavelength (nm)
Emission wavelegth (nm)
250
300
350
400
450
300
400
500
600
Excitation wavelength (nm)
Emission wavelegth (nm)
250
300
350
400
450
Excitation wavelength (nm)
250
300
350
400
450
Excitation wavelength (nm)
Excitation wavelength (nm)
Excitation wavelength (nm)
250
300
350
400
450
250
300
350
400
450
250
300
350
400
450
300
400
500
600
Emission wavelegth (nm)
300
400
500
600
Emission wavelegth (nm)
300
400
500
600
Emission wavelegth (nm)
300
400
500
600
Emission wavelegth (nm)
300
400
500
600
0
0.1
0.2
0.3
0.4
0.5
C
A
M
N
B
T
Int
0
0.01
0.02
0.03
0.04
0.05
C
A
M
N
B
T
Int
0
0.005
0.01
0.015
0.02
0.025
C
A
M
N
B
T
Int
0
0.05
0.1
C
A
M
N
B
T
Int
0.5
1
1.5
2
2.5
3
C
A
M
N
B
T
Int
0.2
0
0.4
0.6
(a)
(b)
(c)
(d)
(e)
(f)
Figure 7.2. The variability in EEM fluorescence for whole DOM collected from surface waters compared to ultrafiltered LMW permeate (<1 kDa MWCO) and HMW retentate (>1 kDa MWCO) fractions. (a–c) Susquehanna River water collected at the head of the Chesapeake Bay. (d–e) Coastal
seawater collected from the Middle Atlantic Bight. The boxes and letters on each EEM contour plot
refer to the fluorescent peak region designations from Table 7.1.