Physicochemical Effects on Dissolved Organic Matter Fluorescence in Natural Waters - Aquatic Organic Matter Fluorescence - page 239

A: River CDOM D: Marine Surface

600 0.5 600

0.05

0.4

0.04

500 500

0.3

0.03

C C

A A

0.2

Int Int

0.02

400

400 M M

N N

0.1

0.01

T T

B B

300 0 300

0

250 300 350 400 450 250 300 350 400 450

Excitation wavelength (nm) Excitation wavelength (nm)

B: River Permeate E: Marine Permeate

600

600

0.025

0.02

500 500

0. 1

0.015

C

C

A

A

Int

Int 0.01

400 M

400 M 0.05

N

N

0.005

T

T

B

B

0

300 300

0

250 300 350 400 450 250 300 350 400 450

Excitation wavelength (nm) Excitation wavelength (nm)

C: River Retentate F: Marine Retentate

600

600

3

2.5

0.6

500 500

2

0.4

C C

1.5

A A

Int Int

400

M 400 M

1

0.2

N

N

0.5

T T

B B

300 300

0

250 300 350 400 450 250 300 350 400 450

Excitation wavelength (nm) Excitation wavelength (nm)

Figure 7.2. The variability in EEM fluorescence for whole DOM collected from surface waters com-
pared to ultrafiltered permeate (<1 kDa MWCO) and retentate (>1 kDa MWCO) fractions. (A-C)
Susquehanna River water collected at the head of the Chesapeake Bay. (D-E) Coastal seawater col-
lected 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 .