Fluorescent Dissolved Organic Matter in Natural Waters - Photobiogeochemistry of Organic Matter - page 503

Table 4 Photochemical and microbial changes of luorescence intensity (FI) of fulvic acid-like (peak C), luorescent 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 wa t ers
Type of samples/locations Origin of DOM Filtration Irradiation

time
(h/days)

Solar
intensity
(MJm − 2 )

Changes in luorescence intensities References

Photoirradiation Microbial Photoirradiation Microbial

size/type ( μ m)

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 μ M 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

− 63 − 0.1

- MQ water 10 h (Xe lamp) nd na nd 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(unpublished data)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(unpublished data)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

− 40

- MQ water 0.5 h (Xe lamp) nd nd nd nd Mostofa et al. ( 2005a )