Aiken
42
440
420
400
380
Excitation Wavelength, nm
360
340
320
300
280
260
300
350
400
450
500
550
600
300
350
400
450
500
550
600
300
350
400
450
Emission Wavelength, nm
500
550
600
240
440
420
400
380
Excitation Wavelength, nm
360
340
320
300
280
260
240
440
420
400
380
Excitation Wavelength, nm
360
340
320
300
280
260
240
0.07
0.06
0.05
0.04
0.03
0.02
0.01
0
0.14
0.12
0.1
0.08
0.06
0.04
0.02
0
2
1.5
1
0.5
0
(a)
(b)
(c)
Figure 2.2. Excitation emission spectra for samples from (a) the Pacific Ocean, (b) the Gulf of Maine,
and (c) the Penobscot River. Commonly reported peaks and region locations described in Table 2.1
are also graphically presented in (c). (See Plate 1.)