Geoscience Reference
In-Depth Information
(a)
5
0
-5
-10
-15
-20
-25
-30
0 0 0 0 0 0 0 0 0 0
100
Days
(b)
5
0
-5
-10
-15
-20
-25
-30
-35
-40
-45
-50
-55
-60
0 0 0 0 0 0 0 0 0 0
100
Days
Figure 4.3. The percent change in fluorescence intensity of four freshwater samples over 90 days of
storage via refrigeration (4°C) in the dark; horizontal dashed black lines represent analytical repro-
ducibility. (a) Fulvic-like fluorophore (typical excitation maxima 310-370 nm and emission maxima
410-460 nm). (b) Protein-like fluorophore (tryptophan-like fluorophore; typical excitation maxima
270-280 nm and emission maxima 335-360 nm). Black circles, solid black lines = peatland river
(DOC = 14.6 mg/L); dark gray squares, dashed black lines = organic-rich river (DOC = 9.8 mg L
-1
);
light gray triangles, dash-dot black lines = agricultural river (DOC = 4.8 mg L
-1
); white diamonds,
dot black lines = urban river (DOC = 3.2 mg L
-1
).
