505
Fluorescent Dissolved Organic Matter in Natural Waters
Table 4 Photochemical and microbial changes of fluorescence intensity (FI) of fulvic acid-like (peak C), fluorescent whitening agents (FWAs)-like (peak W) tryptophan-like, tyrosine-like or
protein-like (peak T) substances as a result of photoirradiation experiments conducted on standard substance and natural waters
Type of samples/locations
Origin of DOM
Filtration
Irradiation
time
(h/days)
Solar
intensity
(MJm
−2 )
Changes in fluorescence intensities
References
size/type (μm)
Photoirradiation Microbial Photoirradiation Microbial
Peak C-region
Peak T- and T
UV -regions
%
%
Suwannee River Fulvic Acid
(SRFA): 1 mg L
−1
Allochthonous/plant
material
MQ water
10 h (Xe lamp) nd
−42
(+) 0.1
na
na
Mostofa et al. (2011)
SRFA:1 mg L
−1
Allochthonous/plant
material
MQ water
3 h (Xe lamp) nd
−19
nd
na
na
Mostofa et al. (2011)
SRFA:1 mg L
−1
+ 50 μM
NO
2
− Allochthonous/plant
material
MQ water
3 h (Xe lamp) nd
−22
nd
na
na
Mostofa et al. (2011)
SRFA: 3 mg L
−1
Allochthonous/plant
material
MQ water
3 h (Xe lamp) nd
−23
nd
na
na
Mostofa et al. (2011)
SRFA: 5 mg L
−1
Allochthonous/plant
material
MQ water
3 h (Xe lamp) nd
−20
nd
na
na
Mostofa et al. (2011)
Suwannee River Humic Acid
(SRHA): 1 mg L
−1
Allochthonous/plant
material
MQ water
10 h (Xe lamp) nd
(+) 70
nd
na
na
Mostofa et al. (2011)
SRHA: 3 mg L
−1
Allochthonous/plant
material
MQ water
3 h (Xe lamp) nd
−17
nd
na
na
Mostofa et al. (2011)
SRHA: 5 mg L
−1
Allochthonous/plant
material
MQ water
3 h (Xe lamp) nd
(+) 5
nd
na
na
Mostofa et al. (2011)
Tryptophan standard: 1 mg L
−1
–
MQ water
10 h (Xe lamp) nd
na
nd
−63
−0.1
Mostofa et al. (2011)
Tryptophan standard: 3 mg L
−1
–
MQ water
3 h (Xe lamp) nd
na
nd
−23
nd
Mostofa et al. (2011)
Tryptophan standard: 5 mg L
−1
–
MQ water
3 h (Xe lamp) nd
na
nd
−20
nd
Mostofa et al. (2011)
Tyrosine standard: 1 mg L
−1
–
MQ water
10 h (Xe lamp) nd
na
nd
−4
(+) 5
Mostofa KMG et al.,
(unpublished data)
Tyrosine standard: 3 mg L
−1
–
MQ water
3 h (Xe lamp) nd
na
nd
−36
nd
Mostofa KMG et al.,
(unpublished data)
DSBP standard: 1 mg L
−1
–
MQ water
10 h (Xe lamp) nd
−94
(+) 0.1
na
na
Mostofa et al. (2011)
DSBP standard: 1 mg L
−1
–
MQ water
0.5 h (Xe lamp) nd
−40
nd
nd
nd
Mostofa et al. (2005a)
DSBP standard: 3 mg L
−1
–
MQ water
3 h (Xe lamp) nd
−73
nd
nd
nd
Mostofa et al. (2011)
DSBP standard: 5 mg L
−1
–
MQ water
3 h (Xe lamp) nd
−60
nd
nd
nd
Mostofa et al. (2011)
(continued)